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WorksheetsPhysical Science Mid-Term Study Guide
Total questions: 109
Worksheet time: 1hrs 22mins
An airplane is flying at 635 km per hour at an altitude of 35,000m. It is currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is its velocity?
635 km/h
16m/min
35,000 m/s
This cannot be determined without further information about its direction
The SI unit for speed is
mph
ft/s^2
m/s
v/t
On a speed-time graph, a line with a negative slope indicates that the object is
speeding up
slowing down
not moving
traveling at a constant speed
The combination of all of the forces acting on an object is called the
total force
union forces
super force
net force
If the net force on an object is zero then the object has
reaction forces
action forces
balanced forces
unbalanced forces
A tug-of-war that results in one team pulling the other across the line is an example of
action forces
reaction forces
balanced forces
unbalanced forces
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusion can be drawn?
The mass of the object has increased
Gravity on the object has increased
The object is experiencing some kind of friction
The momentum of the object has reached a maximum
An object is in motion when
You observe the object move
The object's speed increases
The object's displacement is greater than the distance traveled
The object changes position relative to a stationary reference point
Which straight-line acceleration indicates an increase in speed
0 m/s^2
-15m/s^2
4 m/s^2
all of the above
What is an example of balanced forces acting on an object
A kangaroo jumping
A car turning a corner
A cyclist slowing down
A leaf lying on the grass
A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?
equal to the force pulling the car downhill
greater than the force pulling the car downhill
greater than the force pulling the car uphill
smaller than the force pulling the car uphill
Average speed can be represented by the mathematical expression
distance/time
distance x time
time- distance
time +distance
The ____ of an object consists of its speed and direction.
velocity
instantaneous speed
average speed
displacment
A car moving at an average speed of 55.0mi/h for 4.25 h has traveled
0.08 mi
13 mi
55 mi
234 mi
On a distance vs time graph of an object's motion, distance is usually
plotted on the x-axis
greater than time
the dependent variable
measured in ft/min
When the motion of an object is shown by a straight line on a distance vs time graph with distance on the y-axis, the slope of the line is the
distance traveled
displacement
speed
time of travel
On a bus traveling north at 20.0m/s, a child stands up and walks towards the back of the bus at 1.3 m/s. What is the child's resultant velocity?
18.7 m/s north
18.7 m/s south
21.3 m/s north
21.3 m/s south
Displacement must always indicate
velocity
direction
speed
time
Speeding up, slowing dow, and changing direction is best described as
velocity
distance
displacement
acceleration
When centripetal acceleration occurs, an object
speeds up
slows down
changes direction
is stationary
The equation for finding average acceleration for straight line motion is
initial velocity-final velocity x time
final velocity - initial velcotiy / time
initial velocity +final veloctiy +time
initial velocity +final velocity - time
Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of
0.32 m/s
0.32 m/s^2
3.1 m/s
3.1 m/s^2
A cyclist is traveling at an initial speed of 10 m/s. She accelerates at a rate of 0.500m/s^2. What is her final speed after 9.0 s?
14.5 m/s
14.5 m/s^2
5.5 m/s
5.5 m/s^2
When velocity changes by the same amount over each time interval, acceleration is
zero
constant
positive
negative
On a velocity vs time graph, what shows the value of the acceleration?
the slope of the line
the x-axis
the y-axis
the final velocity
A cheetah can accelerate at up to 6.0 m/s^2. How long does it take for a cheetah to speed up from 10.5 m/s to 12.2 m/s?
0.28s
1.7s
3.5s
10s
Net force is
the force acting in the same direction as an object's movement
the force acting in the opposite direction of an object's movement
the combination of all forces acting on an object
the force of gravity pulling an object down
An object experiencing balanced forces
has a net force of zero
is speeding up
is slowing down
stops moving
A game of tug-a-war is an example of
rolling friction
air resistance
streamlining
unbalanced forces
Which is an example of static friction
pulling a skier behind a boat
pushing a box that is at rest
braking a car going down a hill
driving a car up a hill
Which is NOT an example of sliding friction?
ice skating on a frozen pond
taking notes with a pencil
rolling a ball across a desk
pushing a book across a table
In order to increase a car's speed, the force pushing it forward must be
a negative force
rolling force
fundamental friction
kinetic friction
The friction between objects that are stationary is called
static friction
rolling friction
fundamental friction
kinetic friction
Which is an example of helpful friction?
wearing batting gloves
applying the brakes on a car
sprinkling sand on an icy road
all of the above
Which of the following requires friction
cleaning pan
writing a letter
skiing
all of the above
Using lubricants on engine parts is an example of reducing
force
friction
acceleration
motion
On a distance vs time graph, the line of an object at rest is a
curved line with a slope of zero
flat line with a slope of zero
jagged line with a negative slope
curved line with a positive slope
The difference between speed and velocity is that velocity includes
direction
distance
time
weight
An example of helpful friction is
car tires wearing out
getting holes in your socks
writing on paper with a pen
scraping your knee on the floor
Friction is defined as
force that opposes motion between two surfaces that are touching
rate at which velocity changes
resistance of an object to a change in its velocity
speed of an object in a particular direction
An object is in motion when
the net force acting on the object is zero
friction occurs
the object's displacement is greater than the distance traveled
the object changes position relative to a frame of reference
Force is a quantity made up of
weight and speed
magnitude and direction
time and acceleration
mass and velocity
which is an example of balanced forces acting on an object?
a kangaroo jumping
a car turning a corner
a person pushing a sofa
a dog jumping
Acceleration is defined as the change in velocity divided by
speed
final velocity
time
distance
which is an example of kinetic friction
friction between a car's windshield and the air as you drive into the wind
friction between your shoes and the ground when you stand still
friction between a sticky note and the page of a book as it marks your place
friction between your skin and a pencil as it rests in your palm
In order to determine speed, you must know
only time
only distance
both time and distance
neither time nor distance
which of the following does NOT indicate velocity
14 ft/s SSE
40 mi/h toward the town square along the main street
80 km/h going from New York toward New Jersey
28 miles from Los Angeles to Catalina Island
When an object slows down, its acceleration is
positive
centripetal
negative
constant
If the net force acting on a stationary object is zero, then the object will
accelerate in the direction of the strongest force
remain at rest
begin moving backwards
decelerate at a steady rate of speed
Displacement
must be in a particular direction
is the change in position of an object
must be a straight line
all of the above
The force of gravity, the electromagnetic force, the strong nuclear force, and the weak nuclear force are considered
fundamental forces
resultant forces
frames of reference
centripetal forces
On a speed vs time graph, constant acceleration is represented by a
straight line
slightly sloped line
jagged line
steeply sloped line
The friction between the bristles of your toothbrush and the surfaces of your teeth is an example of
rolling friction
static friction
helpful friction
all of the above
Which straight-line acceleration indicates an increase in speed
0 m/s^2
-15 m/s^2
4 m/s^2
all of the above
If you are given the mass of an object in pounds, the time in seconds, and the distance in feet, what must you do before you can calculate the momentum in SI units?
convert the mass to kilograms
convert the distance to meters
convert to kilograms and meters
non of the above
Of the following, the greatest gravitational force would occur between
a marble and a baseball 5 meters apart
a loaded freighter on the high seas and earth
the moon and an astronaut standing on the moon
the moon and earth
The law that states that every object maintains constant velocity unless acted on by an unbalanced force is
newtons first law of motion
newtons second law of motion
newtons third law of motion
the law of conservation of momentum
The law that states that for every action force there is an equal and opposite reaction force is
newtons first law of motion
newtons second law of motion
newtons third law of motion
the law of conservation of momentum
The law that states that the unbalanced force acting on an object equals the objects mass times its acceleration
newtons first law of motion
newton second law of motion
newtons third law of motion
the law of conservation of momentum
One pound is equal to how many newtons
4.448 N
2.2 N
0.225 N
12.5 N
Which of the of following equations is correct?
w=mg
w=m/g
w=g/m
w=g+m
What is the approximate terminal velocity of a sky diver before the parachute opens?
32 mi/h
32 km/h
320 mi/h
320 km/h
Earth pulls on the moon and holds the moon in its orbit. The moon pulls on the earth with an equal and opposite force. This is an example of
newtons first law
newtons second law
newtons third law
non of the above
What is the unbalanced force that slows down a ball rolling across the floor?
the force of friction
the force of gravity
the force of inertia
the force of momentum
If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision
the law of conservation of momentum
the law of universal gravitation
newtons third law
newtons second law
Express the following as an equation: One newton is the force that can give an object with a mass of 1kg an acceleration of 1 m/s^2
1 N=1kg / 1 m/s^2
1 N x 1kg = 1 m/s^2
1 N = 1m/s^2 / 1kg
1 N = 1kg x 1m/s^2
When the gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called?
resultant velocity
terminal velocity
instantaneous velocity
average velocity
In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height
the book would accelerate twice as fast as the rock
the rock would accelerate twice as fast as the book
the book would accelerate ten times as fast as the rock
they would not differ; they would be the same
What happens immediately after a sky diver opens her parachute?
air resistance greatly increases
the sky diver is in free fall
the sky divers speed greatly increases
the force of gravity greatly increases
Which statement illustrates newtons first law
a stone will not move unless something pushes or pulls it
a ball rolling across the floor eventually slows down
as a car comes to a stop, the passengers continue to move foward
all of the above
Which object has the greatest inertia
a tennis ball
a bowling ball
a beach ball
a volleyball
What force causes a skater sliding on the ice to gradually slow down?
a balanced force
inertia
friction
acceleration
A seat belt helps you when your car stops suddenly by providing a(n)
balanced forward force
unbalanced forward force
balanced backward force
unbalanced backward force
One newton is the force that can give a mass of 1 kg an acceleration of
1 m/s
9.8 m/s
1 m/s^2
9.8 m/s^2
Which of the following will result in the greatest acceleration?
56 N acting on a 1-kg box
56 N acting on a 2-kg box
23 N acting on a 2-kg box
23 N acting on a 5-kg box
What unbalanced force is needed to give a 976 kg vehicle acceleration of 2.50 m/s^2?
3.90 x 10^2 N
3.90 x 10^2 Ib
2.44 x 10^3 N
2.44 x 10^3 Ib
A force of 240 N causes an object to accelerate at 3.2 m/s^2. What is the mass of the object?
0.013 kg
75 kg
240 kg
768 kg
A 0.25 kg steel ball experiences a net force of 1.15 N as it rolls down a ramp. What is the acceleration of the ball?
0.29 m/s^2
0.90 m/s^2
1.4 m/s^2
4.6 m/s^2
If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have _____ acceleration as (than) Car B
the same
greater
less
the oppsosite
The gravitational force between two objects depends on masses of objects and
acceleration of objects
distance between objects
speed of objects
size of objects
Which of the ofllowing objects exerts a gravitational force?
a bowling ball
a book
a feather
all of the above
Increasing which of these conditions results in more gravitational force between two objects?
distance
acceleration
mass
surface area
When an object is in free fall, the only force acting on it is
gravity
friction
inertia
terminal velocity
Free-fall acceleration near earths surface
depends on an objects weight
is the same for all objects
depends on an objects mass
none of the above
How much does a 59.0 kg women weight on earth?
6.02 N
59.0 Ib
145 Ib
578 N
Orbital motion is a combination of
mass and friction
foward motion and free fall
acceleration and gravity
weight and vertical velocity
Astronauts "float" when inside an orbitting spaceship because they are
weightless
in a vaccum
in free fall
outside earths gravity
Whenever a force is exerted, another force occurs that is __ in size, and _____ in direction
equal, same
smaller, same
equal, opposite
smaller, opposite
An objects momentum is determined by the objects
weight and velocity
mass and acceleration
mass and velocity
weight and acceleration
What is the momentum of a 255 g apple falling at 16.0 m/s?
4.08 m/s^2 downward
4.08 kg x m/s downward
15.9 m/s^2 downward
15.9 kg x m/s downward
When a moving bowling ball hits a pin, some of the balls momentum
doubles in force
increases the pins mass
is transferred to the pin
is lost
Calculate the velocity of a 90.5 kg man running south with a momentum of 389 kg x m/s
0.233 m/s south
4.30 m/s south
23.3 m/s south
35.2 m/s south
How does the total momentum of two objects before a collision compare with the total momentum after the collision
it is the same
it is less
it is equal to zero
it is greater
If you divide momentum by velocity, the result is the value of the objects
mass
direction
energy
speed
A 10 kg dog chasing a rabbit north at 6 m/s has a momentum of
0.6 kg m/s
60.0 kg m/s north
60 m/s
60 kg/s
When the velocity of an object changes, it is acted upon by a(n)
force
inertia
momentum
deceleration
If the net force on an object is zero, then the object has
reaction forces
action forces
balanced forces
unbalanced forces
When objects are moved further apart from each other, the force of gravity between them
increases
stays the same
decreases
decreases at first then increases
The SI unit of force, named after the scientist who described the relationship between motion and force, is called the
newton
einstein
curie
pasteur
When air resistance balances the weight of a falling object the velocity
slowly decreases
remains constant
rapidly increases
none of the above
The weight of an object can be calculated by mutliplying mass by
distance
speed
velocity
free fall acceleration
Which object does NOT have momentum?
a fish swimming in a pong
a feather falling to the ground
a rock by the side of the road
a boulder rolling down a hill
What is the reaction force when you place a cup on a table?
the force of the cup on the table
the force of the table on the cup
the force of gravity on the table
the force of gravity on the cup
Which of the following is NOT a factor in calculating momentum
mass
direction
acceleration
speed
Whenever an object is standing still, which value is always zero?
speed
velocity
momentum
all of the above
A tug-of-war that results in one team pulling the other across the line is an example of
action forces
reaction forces
balanced forces
unbalanced
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusions can be drawn?
the mass of the object has increased
gravity on the object has increased
the object is experiencing some kind of friction
the momentum of the object has reached a maximum
Weight is best desecribed as
an objects resistance to acceleration
what causes an object to fall
the downward force exerted on an object due to gravity
a force solely dependent on an objects mass
Which of the following units is used to measure acceleration?
m/s
m s
m/s^2
m^2/s^2
