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WorksheetsUntitled Quiz
Total questions: 89
Worksheet time: 45mins
an action exerted on an object which may change the object's state of rest or motion defines
acceleration
force
mass
velocity
units that measure weight are units of
acceleration
force
mass
velocity
a force unit is defined as the product of a mass unit and a unit of
time
displacement
VELOCITY
acceleration
which of the following statements describe force diagrams?
i. force diagrams show force vectors as arrows
ii. forces exerted on the object are represented
iii. forces exerted by ht eoject are represented
i nad ii
i and iii
ii and iii
i, ii, and iii
which of the following statements describe free-body diagrams?
i. force diagrams show force vectors as arrows
ii. forces exrted on the object are represented
iii. forces exerted by the object are represented
i and ii
i and iii
ii and iii
i, ii, and iii
the gravitational force exerted on an object would most likely be represented by which force vector?
up
right
down
left
which of the following situations describes inertia?
a stationary object tends to resits being moved
a moving object tends to resist a change in speed
a moving object tends to resist a change in direction
all of the above
which of the following is true of inertia?
it is described in Newton's first law of motion
it is a property of motion
it is measure dby weight
all of the above
two forces act on an object. the magnitude of the net force acting on the object
equals the sum of the mangitudes of the two forces
equals the difference in the magnitudes of the two forces
equals teh average of the two forces
can not be determined from the given information
a force of 5 n and a force of 15 n acting on an object can produce the following net forces except
20 n
15 n
10 n
5 n
two sogs are tugging on a toy. one dog pulls with a horizontal force of 14 n due north. the other is pulling due east with a horizontal force of 14 n. what is the direction of teh net external force on the toy?
north
northeast
west
northwest
which of the following statements describe an object in equilibrium?
i. the object is at rest
ii. the object is moving at constant velocity
iii. the net external force on the object is zero
i and ii
i and iii
ii and iii
i,ii and iii
a signle force acting o an object is represented in a free-body diagram of the object by hte following force vector: up. which of the following force vectors represents a single force acting on the object that will bring the object into equilibrium
up
right
down
left
the change in the horizontal velocity of a 12-kg scooter is +0.5 m/s. what is the net horizontal force acting on it?
+24 N
+6 N
greater than 0 N
0 N
in which situation is the net force acting on a car zero?
the car increases speed and changes direction
the car increases speed but does not change direction
the car maintains its speed but changes direction
the car maintains both its speed and direction
in an action-reaction pair, the
action force is exerted first
action force and the reaction force are equal in magnitude and act in the same direction
action force and the reaction force are contact forces only
action force and the reaction force act on two different objects
a batter strikes a baseball with a bat. identify an action-reaction pair and describe the forces exerted by each
the batter exerts a force on the bat; the ball exerts a force on the bat
the batter exerts a force on the bat; the bat exerts a force on the batter
the bat exerts a forc eon the batter; the bat exerts a force on the ball
the ball exerts a force on the bat; the bat exerts a force on the batter
the acceleration due to gravity
is caused by a field force
has a magnitude of 9.81 m/s at earth surface
is represented by the symbol ag
all of the above
the normal force
equals fg in magnitude
points vertically upward
is a scalar equantity
acts perpendicular to a surface
for an object in contact with a given surface, the kinetic friction acting on the object
usually is more than static frction
is an independent of the normal force
depends on the composition and qualities of the surfaces in contact
acts perpendicular to the surface
which of the following is the cause of an acceleration?
speed
inertia
force
velocity
whatcauses a moving object to change direction?
acceleration
velocity
inertia
force
a newton is equivalent to which of the following quantities?
kg
kg(m/s)
kg(m/s2)
kg(m/s)2
the length of a force vector represents the
cause of the force
direction of the force
magnitude of the force
type of force
a free-body diagram represents all of teh following except
the object
direction of the force
forces exerted by the object
forces exerted on the object
in the free-body diagram shown below, which of the following is the gravitational force acting on the car?
5800 N
775 N
14700 N
13690 N
which of the following is teh tendency of an object to maintain its state of motion?
acceleration
inertia
force
velocity
if a non-zero net force is acting on an object, then the object is definetly
at rest
moving with a constant velocity
being accelerated
losing mass
which statement about the acceleration of an object is correct?
the acceleration of na object is directly proportional to teh net external force acting on the object and inversely proportional to the mass of the object
the acceleration of an object is directly proportional to the net external force acting on the object nad directly proportional to the mass of the object
the acceleration of an object is inversely proportional to teh net external force acting on the object and inerversely proportional to the mass of the object
the acceleration of an object is inversely proportional to the net external force acting on the object and directly proportional to the mass of the object
which are simultaneous equal but opposite forces resulting from the ineraction of two objects?
net external forces
field forces
gravitational forces
action-reaction pairs
newton's third law of motion involves the interactions of
on eobject and one force
one obejct and two forces
two objects and one force
two objects and two forces
the magnitude of the gravitational force acting on an object is
frictional force
weight
inertia
mass
a measure of the quantity of matter is
density
weight
force
mass
a change in the gravitational force acting on an object will affect the object;s
mass
coefficient of static friction
weight
inertia
in the free-body diagram shown below, which of the following is the gravitational force acting on the balloon?
1520 N
950 N
4050 N
5120 N
as an object falls toward Earth,
the object does not exert a force on Earth
the object exerts a downward force on earth
Newton's third law does not apply
the upward acceleration of earth is negligible because of its large mass
as a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. at the moment the player begins to jump, the force of the floor on the shoes is
greater than the players weight
equal in magnitude an opposite in direction to the player's weight
less than the player's weight
zero
which of the following sentences uses work in the scientific sense
stan goes to worj on the bus
anne did work on the project for 5 hours
joseph found that holding the banner in place was hard work
an engine does work on a car when the car is moving
work is done on an object
whenever a force acts on the project
whenever a force is perpendicular to the displacement of the obejct
whenever a force causes a displacement of the object
whenever a net force acts on the object
in which of the following cases is no work done?
a weightlifter lifts a barbell
a weightlifter holds a barbell overhead
a weightlifter slowly lowers a barbell
a weightlifter drops a barbell and the barbell falls to the ground
if the sign of work is negative
the force is in the same direction as the displacement
teh force is perpendicular tot eh displacement
the component of the force that does work is in the direction opposite the displacement
the component of the force that does work is perpendicular to the displacement
a painter lifts a bucket of paint, carries it 5 m hoirzontally, then sets it back down. which of the following is true?
the force of gravity does negative work when the worker lifts the bucket
the painter does positive work on the bucket when carrying it horizontally at constant speed
the painter does positive work on the bucket when setting it down
no net work is done on the bucket
a joule is equivalent to a
N
N(m)
N/m
kg (m/s2)
energy that is due to teh motion of an object is
kinetic energy
potential energy
gravitational potential energy
elastic potential energy
energy stored in the gravitational field of interacting bodies is
kinetic energy
nonmechanical energy
gravitational potential energy
elastic potential energy
energy associated with a compressed or stretched object is
kinetic energy
pontetnial energy
gravitational potential energy
elastic potential energy
how does the kinetic energy of an object change if the object's? speed doubles?
the kinetic energy decreases to half its original value
the kinetic energy doubles
the kinetic energy increases by a factor of 4
the kinetic energy does not change
friction does -400 J of net work on a moving car. how does this affect the kientic energy of the car?
the kinetic energy increases by 400 J
the kinetic energy decreases by 400 J
the kinetic energy decreases by 160 Kj
the kientic energy does not change
which of the following does not affect gravitational potential energy?
an objects mass
san objects height relative to a zero level
teh free faall acceleration
an objects speed
which of the following is true of the conservation of energy in a closed system?
kinetic energy is alwasy conserved
potential energy is alwasy conserved
mechanical energy si always conserved
total energy is alwasy conserved
the mechanical energy of a system of objects is
the sum of kinetic energy and gtavitational potential energy
the sum of kinetic energy and elastic potential energy
the sum of kinetic energy and all relevant forms of potential energy
the sum of all forms of energy
mechanical energy is not conserved when
gravitational potential energy is converted to kinetic energy
kinetic energy is converted to gravitational potential energy
kinetic energy is converted to elastic potential energy
frction is not negligible
in which of teh folllowing situations is mechanical energy most likely to be conserved?
a football flies through the air
a feather falls from teh sky
a skateboard rolls into the grass
a hocket palyer digs his skates into the ice
if mechanical energy is conserved in a system, the energy at any point in time can be in the form of
kientic energy
gravitational potential energy
elastic potential energy
all of the above
which of the following is not a form of mechanical energy?
kinetic energy
cehmical potential energy
gravitational potential energy
elastic potential energy
which of the following is evidence that frictional forces are present in a system?
interactions in the system cause an increase in temperature
interactions in the system produce sound
mechanical energy is not conserved
all of the above
an egg suspended above the ground has 2.0 K of gravitational potential energy, the egg is then dropped and falls tot eh ground. waht is the kinetic energy of the egg just as it reached the ground?
-2.0 J
0 J
2.0 J
4.0 J
which of the following refers to teh rate at which energy is transferred?
work
kinetic energy
mechanical energy
power
which of the following refers to teh rate at which work is done?
energy
kinetic enrgy
mechanical energy
power
how much work can a motor with a power output of 25 W do in 1 second?
1/25 J
1 J
25 J
25 W
if a machine increases the distance over which work is done,
the force required to do the work is less
the force required to do the work is greater
teh force required t do the work is the same
the amount of work done is increased
if a machine decreases the distance over which work is done,
the force the machine applies is less
the force the machine applies is greater
the force teh machine applies is the same
the amount of work done is decreased
a 100 w light bulb
converts 100 J of kinetic energy to potential energy each second
converts 100 J of potential energy to kientic energy each second
converts 100 J of mechanical energy to nonmechanical energy each second
converts 100 J of electrical energy to other forms of energy each second
a force does work on an object is a component of the force
is perpendicular to teh displacement of the object
is parallel to the displacement of the object
perpendicular to teh displacement of the object moves the object along a path that erturns the object to its starting position
parallel to teh displacement of the object moves the obejct 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
in which of hte following scenarios is work done
a weightlifter holds a barbell overhead for 2.5 second
a construction worker carries a heavy beam while walkign 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 holl
which of the followign energy forms is not involved in hitting a tennis ball?
kinetic energy
chemical potential energy
gravitational potential energy
elastic potential energy
the main difference between kinetic energy and potential energy is taht
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 invovles position
although both energies invovles position, only potential energy involves motion
gravitational potential energy is always measured in relation to
kinetic energy
mechanical energy
total potential energy
a zero level
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
a more powerful motor can do
nore 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
if a 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 teh force
no work is done
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?
0 J
0.5 J
2 J
20 J
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?
-25 J
0 J
25 J
50 J
if both the mass and the velocity of a ball were tripled, the kinetic energy of the ball would increase by a factor of
3
6
9
27
what isthe kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?
54.0 J
87.0 J
108 J
216 J
what is the potential energy of a 1.0 kg mass 1.0 m above the ground?
1.0 J
9.8 J
20 j
96 j
what is the average power supplied by a 60 kg person running up a flight of stairs a vertical distance of 4 m in 4.2 seconds?
57 W
240 W
560 W
670 W
the material through which a mechanical wave travels in
a medium
empty space
ether
air
the distance between two troughs of a trasnverse wave is the wave's
amplitude
wavelenght
frequency
rarefaction
a ___ wave travels through a medium as a series of compressions and rarefactions
sine
longitudinal
pulse
transverse
a wave is passing through a uniform medium. as the frequency of this wave increases, its wavelength
depends on amplitude
decreases
increases
does not change
the amplitude of a mechanical wave determines how much ____ the wave transfers per unit time
energy
air
wavelength
matter
when two waves having displacements in opposite directions meet, ___ occurs.
complete cancellation
no interference
constructive interference
destructive interference
two waves meet and interfere constructively. which one fo the following factors increases?
period
frequency
amplitude
wavelength
in a standing wave on a vibrating string, a point that appears to remain stationary is a(n)
antinode
point of constructive interference
node
rarefaction
which of the following most affects the wavelength of a mechanical wave moving through a medium? assume that the frequency of the wave remains constant
the nature of the medium
the amplitude
the height of a crest
the energy carried by the wave
when a mechanical wave's amplitude is reduced by half, the energy the wave carries in a given time interval is
doubled
increased by a factor of 1.4
decreased to one-half
decreased to one-fourth
