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WorksheetsMidyear Exam Review
Total questions: 35
Worksheet time: 35mins
The area under a curve in a velocity versus time graph gives
acceleration.
velocity.
displacement.
position
You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forward?
Gravity
Normal force due to your contact with the floor of the bus
Force due to friction between you and the floor of the bus
There is no force causing to your fall.
In the figure above, what is the velocity at t = 4.0 s?
0 m/s
10 m/s
-20 m/s
40 m/s
Ball A is dropped from the top of a building. One second later, ball B of equal dimensions and mass is dropped from the same building. As time progresses and ignoring air resistance, the difference in their speeds
increases.
remains constant.
decreases.
cannot be determined from the information given.
Which of the following is an accurate statement?
The momentum of a projectile is constant.
The momentum of a moving object is constant.
If an object is acted on by a non-zero net external force, its momentum will not remain constant.
If the kinetic energy of an object is doubled, its momentum will also double.
If you push three times as hard against a stationary brick wall, the amount of work you do
triples.
is cut in thirds.
remains constant but non-zero.
remains constant at zero.
Objects A and B both start from rest. They both accelerate at the same constant rate. However, object A accelerates for triple the time as object B. What is the distance traveled by object A compared to that of object B?
A third as far.
The same distance.
Three times as far.
Nine times as far.
Mass and weight . . .
have the same measuring units.
represent the force of gravity.
represent the measure of inertia.
None of the above.
An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors.
Both vectors point in the same direction.
The vectors point in opposite directions.
The vectors are perpendicular.
The question is meaningless, since the acceleration is zero.
A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a lower height?
The heavy object, because it has greater kinetic energy.
The lightweight object, because it weighs less.
They both slide to the same height.
Cannot be determined from the information given
Two objects, with masses m1 and m2, are originally a distance r apart. The gravitational force between them has magnitude F. The second object has its mass changed to 4m2, and the distance is doubled to 2r. What is the magnitude of the new gravitational force?
F/2 (half as much)
F (the same)
2F (twice as much)
4F (four times as much)
An apple of mass m rests on a desk. The Earth pulls on this apple with force mg, which we will call the action force. What is the reaction force?
The desk pushing up on the apple with force mg.
The apple pushing down on the desk with force mg.
The desk pushing down on the floor with force mg.
The apple pulling upward on the Earth with force mg.
On a plot of Force versus position (F vs. t), what represents the impulse done by the force F?
The slope of the curve
The length of the curve.
The area under the curve.
The product of the maximum force times the maximum x.
A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which object experiences the smaller impulse?
The ball.
The putty.
Both experience the same momentum change.
It cannot be determined from the information given.
A ball is launched straight up. At its highest point:
Both its velocity and its acceleration are zero.
Its velocity is zero and its acceleration is not zero.
Its velocity is not zero and its acceleration is zero.
Neither its velocity nor its acceleration is zero.
A racecar is driving around a track and makes one complete lap.
The displacement is greater than the distance traveled.
The displacement is equal to the distance traveled.
The displacement is less than the distance traveled.
Both the displacement and distance traveled are zero
What happens to the kinetic energy of a moving object if the net work done is negative?
The kinetic energy increases.
The kinetic energy stays the same.
The kinetic energy decreases.
The kinetic energy is zero
The slope of a velocity versus time graph gives
Displacement
Velocity
Acceleration
Distance
A ball is dropped (neglect air resistance). Which statement is NOT true?
Its kinetic energy is increasing as it falls.
Its thermal energy is decreasing as it falls.
Its potential energy is decreasing as it falls.
Its total energy is staying the same as it falls.
A rocket travels at a constant velocity in empty space far away from any object with mass that creates gravity. Which of the following is true about the force applied on the rocket?
The applied force is greater than its weight.
The applied force is equal to its weight.
The applied force is less than its weight.
No applied force is necessary to maintain the constant velocity.
Object A with mass 4 kg is lifted up 3 m and object B with mass 2 kg is lifted 6 m up. Which of the following statements is true?
Object A has a greater potential energy since it's heavier.
Object B has a greater potential energy since it's lifted higher.
Both objects have the same potential energy.
There is not enough information to determine the potential energy.
Children are racing pinewood derby cars (0.5 kg and 2 kg) that are released at the same time on a ramp track which makes an angle of 45° with the horizontal. In relation to their acceleration:
The 2 kg car accelerates 4 times faster than the 0.5 kg car.
The 0.5 kg car accelerates 4 times faster than the 2 kg car.
Both cars accelerate at the same rate.
There is not enough information to determine the acceleration of the cars.
A traffic light is suspended from a cable. Earth pulls downward on the traffic light with a force of 1500 N. If this is the "action force," what is the "reaction force"?
The cable pulling upward on the traffic light with a 1500 N force.
The traffic light pulling downward on the cable with a 1500 N force.
The cable pulling up on Earth with a 1500 N force.
The traffic light pulling upward on Earth with a 1500 N force.
Car▲ moves twice as fast as car ⬛, and car ▲ has half the mass of car ⬛.
The kinetic energy of car ▲, compared to car ⬛ is half as much.
The kinetic energy of car ▲, compared to car ⬛ is the same.
The kinetic energy of car ▲, compared to car ⬛ is twice as much.
The kinetic energy of car ▲, compared to car ⬛ is four times as much.
A car driving South (-y direction) at a constant speed and is slowing down as it approaches a stop sign. Which of the following describes the motion of the car?
The car is decelerating, and its acceleration is positive.
The car is decelerating, and its acceleration is negative.
The acceleration is zero.
A statement cannot be made using the information given.
Two equal mass balls (one purple and the other yellow) are dropped from the same height, and rebound off the floor. The purple ball rebounds to a higher position. Which ball is subjected to the smaller magnitude of impulse during its collision with the floor?
It's impossible to tell since the time intervals and forces are unknown.
Both balls were subjected to the same magnitude impulse.
The yellow ball.
The purple ball.
The dimensions of acceleration are
length/time
length/time/time
length/time*time
none of the above
A construction worker holds a heavy tool box. How much work is done by the worker?
Fgd
−Fgd
mgh
zero
Power output can be increased by
decreasing the work done on the object.
decreasing the amount of time in which work is done.
increasing the amount of time in which the work is done.
decreasing the force exerted on an object.
Compared to its mass on the Earth, the mass of an object on Jupiter is
less.
the same.
more.
Can't be determined with the information provided.
How much power is required to lift a 30 N chair 0.20 m in 2 s?
12 W
15 W
3 W
1 W
Which of the following is the equivalent of the unit of momentum?
Joule
Newton
Joule second
Newton second
In elastic collisions,
only the total momentum of the colliding objects is conserved.
only the total kinetic energy is conserved.
both the momentum and total kinetic energy are conserved.
neither the momentum nor total kinetic energy are conserved.
When the work done in moving a particle around a closed loop is zero, the forces involved are
non-existent.
non-conservative.
conservative.
centripetal.
The dimensions of force are
mass ⋅ length/time
mass ⋅ length/time*time
newtons
none of the above
