WorksheetsS3 Physics g10
Total questions: 117
Worksheet time: 59mins
In which of the following sentences is work used in the scientific sense of the word?
Holding a heavy box requires a lot of work.
A scientist works on an experiment in the laboratory.
Sam and Rachel pushed hard, but they could do no work on the car.
John learned that shoveling snow is hard work.
In which of the following sentences is work used in the everyday sense of the word?
Lifting a heavy bucket involves doing work on the bucket.
The force of friction usually does negative work.
Sam and Rachel worked hard pushing the car.
Work is a physical quantity.
A force does work on an object if a component of the force
is perpendicular to the displacement of the object.
is parallel to the displacement of the object.
perpendicular to the displacement of the object moves the object along a path that returns
the object to its starting position.
parallel to the displacement of the object moves the object along a path that returns the
object to its starting position.
Work is done when
the displacement is not zero.
the displacement is zero.
the force is zero.
the force and displacement are perpendicular.
What is the common formula for work? Assume that W is the work, F is a constant force, v is the change in velocity, and d is the displacement.
W=Fv
W=Fd
W=Fd2
W=F2d
If the sign of work is negative,
the displacement is perpendicular to the force.
the displacement is in the direction opposite the force.
the displacement is in the same direction as the force.
no work is done.
In which of the following scenarios is work done?
A weightlifter holds a barbell overhead for 2.5 s.
A construction worker carries a heavy beam while walking at constant speed along a flat
surface.
A car decelerates while traveling on a flat stretch of road.
A student holds a spring in a compressed position.
In which of the following scenarios is no net work done?
A car accelerates down a hill.
A car travels at constant speed on a flat road.
A car decelerates on a flat road.
A car decelerates as it travels up a hill.
A child moving at constant velocity carries a 2 N ice-cream cone 1 m across a level surface. What is the net work done on the ice-cream cone?
0J
0.5J
2J
20J
A worker does 25 J of work lifting a bucket, then sets the bucket back down in the same place. What is the total net work done on the bucket?
–25J
0J
25J
50J
A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow?
10J
55j
250 J
1250
A horizontal force of 200 N is applied to move a 55 kg television set across a 10 m level surface. What is the work done by the 200 N force on the television set?
550J
2000J
6000J
11000J
A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60 below horizontal. How much work does the child do on the balloon?
-10J
-6.0J
6.0J
12J
Which of the following energy forms is associated with an object in motion?
potential energy
elastic potential energy
nonmechanical energy
kinetic energy
Which of the following energy forms is associated with an object due to its position?
potential energy
positional energy
total energy
kinetic energy
Which of the following energy forms is not involved in hitting a tennis ball?
kinetic energy
chemical potential energy
gravitational potential energy
elastic potential energy
Which of the following formulas would be used to directly calculate the kinetic energy of an object with mass m bouncing up and down on a spring with spring constant k?
KE=1/2 kx2
KE=1/2 kx2
KE= 1/2 mv2
KE=1/2 mv2
Ball A has triple the mass and speed of ball B. What is the ratio of the kinetic energy of ball A to ball B.
3
6
9
27
What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?
54.0 J
87.0 J
108 J
216 J
Which of the following equations expresses the work-kinetic energy theorem?
MEi = MEf
Wnet =PE
W= KE
Wnet = KE
If friction is the only force acting on an object during a given physical process, which of the following assumptions can be made in regard to the object’s kinetic energy?
The kinetic energy decreases.
The kinetic energy increases.
The kinetic energy remains constant.
The kinetic energy decreases and then increases.
The main difference between kinetic energy and potential energy is that
kinetic energy involves position, and potential energy involves motion.
kinetic energy involves motion, and potential energy involves position.
although both energies involve motion, only kinetic energy involves position.
although both energies involve position, only potential energy involves motion.
Which form of energy is involved in weighing fruit on a spring scale?
kinetic energy
nonmechanical energy
gravitational potential energy
elastic potential energy
Gravitational potential energy is always measured in relation to
kinetic energy.
mechanical energy.
total potential energy.
a zero level.
The equation for determining gravitational potential energy is PEg = mgh. Which factor(s) in this equation is
(are) not intrinsic to an object?
m
g
h
both g and h
Which of the following parameters does not depend stretched?
compression distance
relaxed length
spring constant
stretching distance
What are the units for a spring constant?
N
m
N.m
N/m
If the displacement of a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of
1/4
1/2
2
4
If the mass in a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of
0 (no change).
1/2.
2.
4.
What is the potential energy of a 1.0 kg mass 1.0 m above the ground?
1.0J
9.8J
10J
96J
How much elastic potential energy is stored in a bungee cord with a spring constant of 10.0 N/m when the cord is stretched 2.00 m?
10.0 J
20.0J
40.0 J
200J
Which of the following is a true statement about the conservation of energy?
Potential energy is always conserved.
Kinetic energy is always conserved.
Mechanical energy is always conserved.
Total energy is always conserved.
In the presence of frictional force,
nonmechanical energy is negligible and mechanical energy is no longer conserved.
nonmechanical energy is negligible and mechanical energy is conserved.
nonmechanical energy is no longer negligible and mechanical energy is conserved.
nonmechanical energy is no longer negligible and mechanical energy is no longer
conserved.
Why doesn’t the principle of mechanical energy conservation hold in situations when frictional forces are present?
Kinetic energy is not completely converted to a form of potential energy.
Potential energy is completely converted to a form of gravitational energy.
Chemical energy is not completely converted to electrical energy.
Kinetic energy is completely converted to a form of gravitational energy.
For which of the following situations is the conservation of mechanical energy most likely to be a valid assumption?
A skateboard rolls across a sewer grate.
A parachutist falls from a plane.
You rub your hands together to keep warm.
A soccer ball flies through the air.
Which of the following refers to the sum of kinetic energy and all forms of potential energy?
total energy
Σenergy
nonmechanical energy
mechanical energy
Which of the following are examples of conservable quantities?
potential energy and length
mechanical energy and length
mechanical energy and mass
kinetic energy and mass
Which of the following is a form of mechanical energy?
internal energy
chemical potential energy
gravitational potential energy
electrical energy
Friction converts kinetic energy to
mechanical energy.
potential energy.
nonmechanical energy.
total energy.
A 3.00 kg toy falls from a height of 1.00 m. What will the kinetic energy of the toy be just before the toy hits
the ground? (Assume no air resistance and that g = 9.81 m/s2 .)
0.98 J
9.8J
c. 29.4 J
294J
Which of the following is the rate at which energy is transferred?
potential energy
kinetic energy
mechanical energy
power
Which of the following is the rate at which work is done?
potential energy
kinetic energy
mechanical energy
power
Which of the following equations is not an equation for power, P, in terms of work, W, displacement, d, time interval, Δt, force, F, and/or velocity, v?
P=Fd / Δt
P= W/ Δt
P=Fv
P= Fv/Δt
Which of the following are not units of power?
hp
j
W
j/s
What is the average power supplied by a 60.0 kg person running up a flight of stairs a vertical distance of 4.0 m in 4.2 s?
57 W
240 W
560 W
670 W
Which of the following has the greatest power output?
a weightlifter who lifts a 250 N weight 2.1 m in 3.0 s
a mechanic’s lift that raises a1.2x 104 N car 2.1min 12s
a car engine that does1.2 x103 J of work in5.0s
a crane that lifts a 2.5x 104 N beam at as peed of 1.2m/s
How much power is required to lift a 2.0 kg mass at a speed of 2.0 m/s?
2.0J
4.0J
9.8J
39J
A more powerful motor can do
more work in a longer time interval.
the same work in a shorter time interval.
less work in a longer time interval.
the same work in a longer time interval.
Which of the following equations can be used to directly calculate an object’s momentum, p?
p=mv
p= m/ v
p=FΔt
Δp=FΔt
What are the SI units for momentum?
N.m
J
kg.m/s
kg.m/s2
When comparing the momentum of two moving objects, which of the following is correct?
The object with the higher velocity will have less momentum if the masses are equal.
The more massive object will have less momentum if its velocity is greater.
The less massive object will have less momentum if the velocities are the same.
The more massive object will have less momentum if the velocities are the same.
A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.
Both the child and the bike have the same momentum.
The bike has a greater momentum than the child.
The child has a greater momentum than the bike.
Neither the child nor the bike has momentum.
Which of the following has the greatest momentum?
a tortoise with a mass of 275 kg moving at a velocity of 0.55 m/s
a hare with a mass of 2.7 kg moving at a velocity of 7.5 m/s
a turtle with a mass of 91 kg moving at a velocity of 1.4 m/s
a roadrunner with a mass of 1.8 kg moving at a velocity of 6.7 m/s
A roller coaster climbs up a hill at 4 m/s and then zips down the hill at 30 m/s. The momentum of the roller coaster
is greater up the hill than down the hill.
is greater down the hill than up the hill.
remains the same throughout the ride.
is zero throughout the ride.
A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. The momentum of the chair
was zero while stationary and increased when the person stood.
was greatest while the person sat in the chair.
remained the same.
was zero when the person got out of the chair and increased while the person sat.
A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. The magnitude of the momentum of the rubber ball
increased
decreased
remained the same
was not conserved
Which of the following equations can be used to directly calculate the change in an object’s momentum?
p=mv
p=m/v
p=FΔt
Δp=FΔt
If a force is exerted on an object, which statement is true?
A large force always produces a large change in the object’s momentum.
A large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
A small force applied over a long time interval can produce a large change in the object’s momentum.
A small force always produces a large change in the object’s momentum.
The change in an object’s momentum is equal to
the product of the mass of the object and the time interval.
the product of the force applied to the object and the time interval.
the time interval divided by the net external force.
the net external force divided by the time interval.
Which of the following situations is an example of a visible change in momentum?
A hiker walks through a spider’s web.
A car drives over a pebble.
A volleyball hits a mosquito in the air.
A baseball is hit by a bat.
Which of the following situations is an example of a significant change in momentum?
A tennis ball is hit into a net.
A helium-filled balloon rises upward into the sky.
An airplane flies into some scattered white clouds.
A bicyclist rides over a leaf on the pavement.
A ball with a momentum of 4.0 kgm/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball’s momentum?
–8.0 kg.m/s
–4.0 kg.m/s
0.0 kg.m/s
8.0 kg.m/s
A 0.2 kg baseball is pitched with a velocity of 40 m/s and is then batted to the pitcher with a velocity of 60 m/s. What is the magnitude of change in the ball’s momentum?
2 kg.m/s
4 kg.m/s
8 kg.m/s
20 kg.m/s
The impulse experienced by a body is equivalent to the body’s change in
velocity
kinetic energy
momentum
force
Which of the following statements properly relates the variables in the equation FΔt = Δp?
A large constant force changes an object’s momentum over a long time interval.
A large constant force acting over a long time interval causes a large change in
momentum.
A large constant force changes an object’s momentum at various time intervals.
A large constant force does not necessarily cause a change in an object’s momentum.
A 75 kg person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person
increased
decreased
remained the same
was conserved
A 20 kg shopping cart moving at a velocity of 0.5 m/s collides with a store wall and stops. The momentum of the shopping cart
increase
decrease
remains the same
is conserved
Two objects with different masses collide and bounce back after an elastic collision. Before the collision, the two objects were moving at velocities equal in magnitude but opposite in direction. After the collision
the less massive object had gained momentum.
the more massive object had gained momentum.
both objects had the same momentum.
both objects lost momentum.
A soccer ball collides with another soccer ball at rest. The total momentum of the balls
is zero.
increases
remains constant.
decreases
Two skaters stand facing each other. One skater’s mass is 60 kg, and the other’s mass is 72 kg. If the skaters push away from each other without spinning,
the lighter skater has less momentum.
their momenta are equal but opposite.
their total momentum doubles.
their total momentum decreases.
Two swimmers relax close together on air mattresses in a pool. One swimmer’s mass is 48 kg, and the other’s mass is 55 kg. If the swimmers push away from each other,
their total momentum triples.
their momenta are equal but opposite.
their total momentum doubles.
their total momentum decreases.
In a two-body collision,
momentum is always conserved.
kinetic energy is always conserved.
neither momentum nor kinetic energy is conserved.
both momentum and kinetic energy are always conserved.
The law of conservation of momentum states that
the total initial momentum of all objects interacting with one another usually equals the
total final momentum.
the total initial momentum of all objects interacting with one another does not equal the
total final momentum.
the total momentum of all objects interacting with one another is zero.
he total momentum of all objects interacting with one another remains constant
regardless of the nature of the forces between the objects.
Which of the following statements about the conservation of momentum is not correct?
Momentum is conserved for a system of objects pushing away from each other.
Momentum is not conserved for a system of objects in a head-on collision.
Momentum is conserved when two or more interacting objects push away from each
other.
The total momentum of a system of interacting objects remains constant regardless of
forces between the objects.
Two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. Identify the type of collision.
elastic
nearly elastic
inelastic
perfectly inelastic
Two objects stick together and move with a common velocity after colliding. Identify the type of collision
elastic
nearly elastic
inelastic
perfectly inelastic
After colliding, objects are deformed and lose some kinetic energy. Identify the type of collision.
elastic
nearly elastic
inelastic
perfectly inelastic
Two billiard balls collide. Identify the type of collision.
elastic
nearly elastic
inelastic
perfectly inelastic
Two balls of dough collide and stick together. Identify the type of collision.
elastic
nearly elastic
inelastic
perfectly inelastic
In an inelastic collision between two objects with unequal masses,
the total momentum of the system will increase.
the total momentum of the system will decrease.
the kinetic energy of one object will increase by the amount that the kinetic energy of the
other object decreases.
the momentum of one object will increase by the amount that the momentum of the other
object decreases.
A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball?
It maintains its initial velocity.
It has one-half its initial velocity.
It comes to rest.
It moves in the opposite direction.
A billiard ball collides with a second identical ball in an elastic head-on collision. What is the kinetic energy of the system after the collision compared with the kinetic energy before the collision?
unchanged
one-fourth as great
two times as great
four times as great
Which of the following best describes the momentum of two bodies after a two-body collision if the kinetic energy of the system is conserved?
must be less
must also be conserved
might also be conserved
is doubled in value
In which of the following sentences is work used in the scientific sense of the word?
Holding a heavy box requires a lot of work.
A scientist works on an experiment in the laboratory.
Sam and Rachel pushed hard, but they could do no work on the car.
John learned that shoveling snow is hard work.
In which of the following sentences is work used in the everyday sense of the word?
Lifting a heavy bucket involves doing work on the bucket.
The force of friction usually does negative work.
Sam and Rachel worked hard pushing the car.
Work is a physical quantity.
A force does work on an object if a component of the force
A force does work on an object if a component of the force
is parallel to the displacement of the object.
perpendicular to the displacement of the object moves the object along a path that returns
the object to its starting position.
parallel to the displacement of the object moves the object along a path that returns the
object to its starting position.
Work is done when
he displacement is not zero.
the displacement is zero.
the force is zero.
the force and displacement are perpendicular.
What is the common formula for work?
W=FΔv
W=Fd
W=Fd2
W=F2d
In which of the following scenarios is work done?
A weightlifter holds a barbell overhead for 2.5 s.
A construction worker carries a heavy beam while walking at constant speed along a flat
surface.
A car decelerates while traveling on a flat stretch of road.
A student holds a spring in a compressed position.
In which of the following scenarios is no net work done?
A car accelerates down a hill.
A car travels at constant speed on a flat road.
A car decelerates on a flat road.
A car decelerates as it travels up a hill.
Which of the following energy forms is associated with an object in motion?
potential energy
elastic potential energy
nonmechanical energy
kinetic energy
Which of the following energy forms is not involved in hitting a tennis ball?
kinetic energy
chemical potential energy
gravitational potential energy
elastic potential energy
Which of the following formulas would be used to directly calculate the kinetic energy of a mass bouncing up and down on a spring?
KE=1/ 2kx2
KE=-1/2kx2
KE=1/2mv2
KE=-1/2mv2
Which of the following equations expresses the work-kinetic energy theorem?
MEi=MEf
Wnet=PE
ΔW=KE
Wnet = ΔKE
The main difference between kinetic energy and potential energy is that
kinetic energy involves position, and potential energy involves motion.
kinetic energy involves motion, and potential energy involves position.
although both energies involve motion, only kinetic energy involves position.
although both energies involve position, only potential energy involves motion.
Which form of energy is involved in weighing fruit on a spring scale?
kinetic energy
nonmechanical energy
gravitational potential energy
elastic potential energy
Gravitational potential energy is always measured in relation to
kinetic energy.
mechanical energy.
total potential energy.
a zero level.
What are the units for a spring constant?
N
m
N.m
N/m
Which of the following is a true statement about the conservation of energy?
Potential energy is always conserved.
Kinetic energy is always conserved.
Mechanical energy is always conserved.
Total energy is always conserved.
Which of the following are examples of conservable quantities?
potential energy and length
mechanical energy and length
mechanical energy and mass
kinetic energy and mass
Friction converts kinetic energy to
mechanical energy.
potential energy.
nonmechanical energy.
total energy.
Which of the following is the rate at which work is done?
potential energy
kinetic energy
mechanical energy
power
A more powerful motor can do
more work in a longer time interval.
he same work in a shorter time interval.
less work in a longer time interval.
the same work in a longer time interval.
When comparing the momentum of two moving objects, which of the following is correct?
The object with the higher velocity will have less momentum if the masses are equal.
The more massive object will have less momentum if its velocity is greater.
The more massive object will have less momentum if the velocities are the same.
The less massive object will have less momentum if the velocities are the same.
A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.
Both the child and the bike have the same momentum.
The bike has a greater momentum than the child.
The child has a greater momentum than the bike.
Neither the child nor the bike has momentum.
A roller coaster climbs up a hill at 4 m/s and then zips down the hill at 30 m/s. The momentum of the roller coaster
is greater up the hill than down the hill.
is greater down the hill than up the hill.
remains the same throughout the ride.
is zero throughout the ride.
If a force is exerted on an object, which statement is true?
A large force always produces a large change in the object’s momentum.
A large force produces a large change in the object’s momentum only if the force is
applied over a very short time interval.
A small force applied over a long time interval can produce a large change in the object’s
momentum.
A small force produces a large change in the object’s momentum.
A ball with a momentum of 4.0 kg•m/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball’s momentum?
-8.0 kg•m/s
-4.0 kg•m/s
-0.0 kg•m/s
8.0 kg•m/s
The impulse experienced by a body is equivalent to the body’s change in
velocity
kinetic energy.
momentum.
force
A 75 kg person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person
increased
decreased
remained the same.
as conserved.
Two skaters stand facing each other. One skater’s mass is 60 kg, and the other’s mass is 72 kg. If the skaters push away from each other without spinning,
the lighter skater has less momentum.
their momenta are equal but opposite.
their total momentum doubles.
their total momentum decreases.
In a two-body collision,
momentum is always conserved.
kinetic energy is always conserved.
neither momentum nor kinetic energy is conserved.
both momentum and kinetic energy are always conserved.
The law of conservation of momentum states that
the total initial momentum of all objects interacting with one another usually equals the
total final momentum.
he total initial momentum of all objects interacting with one another does not equal the
total final momentum.
the total momentum of all objects interacting with one another is zero.
the total momentum of all objects interacting with one another remains constant
regardless of the nature of the forces between the objects.
Two objects stick together and move with a common velocity after colliding. Identify the type of collision.
elastic
perfectly elastic
inelastic
perfectly inelastic
Two billiard balls collide. Identify the type of collision.
elastic
perfectly elastic
inelastic
perfectly inelastic
In an inelastic collision between two objects with unequal masses,
the total momentum of the system will increase.
the total momentum of the system will decrease.
the kinetic energy of one object will increase by the amount that the kinetic energy of the
other object decreases.
the momentum of one object will increase by the amount that the momentum of the other
object decreases.
A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball?
It maintains its initial velocity.
It has one-half its initial velocity.
It comes to rest.
It moves in the opposite direction.
