Ch 06 Laws of Motion Test PRACTICE
Ch 06 Laws of Motion Test PRACTICE
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1.The inertia of an object is related to its:
A. / mass and speed.B. / mass and force.
C. / mass only.
D. / speed only.
2.The term that means “all of the forces together on an object”is:
A. / normal force.B. / net force.
C. / frictional force.
D. / weight.
3.The property of matter that resists changes in motion is:
A. / acceleration.B. / inertia.
C. / force.
D. / speed.
4.Newton’s first law of motion is also known as:
A. / the law of universal gravitation.B. / the law of force pairs.
C. / the law of unbalanced forces.
D. / the law of inertia.
5.As the mass of an object is increased, what happens to its inertia?
A. / It increasesB. / It decreases
C. / It stays the same
D. / Inertia and mass are not related in any way
Figure 6-1A
6.Which of the barbells in Figure 6-1A has the most inertia?
A. / The 10-kg barbellB. / The 20-kg barbell
C. / The 30-kg barbell
D. / They all have the same inertia
7.If each of the barbells in Figure 6-1A were pushed with a force of 100 newtons, which would be harder to move?
A. / The 10-kg barbellB. / The 20-kg barbell
C. / The 30-kg barbell
D. / They would all move equally
8.A ball is rolling down a level sidewalk. As it roll, it slows down and stops. Why?
A. / Continued motion requires a force.B. / Frictional force acts on the ball to stop it.
C. / The net force on a moving ball is always zero.
D. / The force that started it moving was taken away.
9.An object moving with constant speed has:
A. / a net force greater than zero.B. / a net force equal to zero.
C. / a net force less than zero.
D. / a constant net force.
10.Changes in motion come from:
A. / unbalanced forces.B. / balanced forces.
C. / mass.
D. / inertia.
11.A 0.15-kilogram baseball and a 7.25-kilogram bowling ball are both rolling along at 3 m/s. Which object is easier to stop and why?
A. / The bowling ball because it has less inertiaB. / The baseball because it has more inertia
C. / The bowling ball because heavy objects are naturally prone to stop on their own
D. / The baseball because it has less inertia
12.A ball with a mass of 1 kg is moving in a straight line at the same speed as a ball with a mass of 10 kg. Both balls are brought to rest in 4.0 seconds. What is true of the force required to stop the balls?
A. / It takes less force to stop the 1 kilogram ball because it has less inertia.B. / It takes more force to stop the 1 kilogram ball because it has more inertia.
C. / It takes the same force to stop both balls because they moving at the same speed.
D. / It takes less force to stop the 10 kilogram ball because it has less inertia.
13.An object at rest has:
A. / both inertia and momentum.B. / neither inertia nor momentum.
C. / momentum but no inertia.
D. / inertia but no momentum.
14.Compare the inertia and momentum of a 0.15-kilogram baseball moving at 50 m/s with the inertia and momentum of a 7.25-kilogram bowling ball moving at 1 m/s.
A. / The baseball has more inertia, but the bowling ball has more momentum.B. / The baseball has both more inertia and more momentum.
C. / The bowling ball has more inertia, but the baseball has more momentum.
D. / The bowling ball has both more inertia and more momentum.
15.The equation that correctly expresses Newton’s second law is:
A. / force = mass acceleration.B. / force = mass acceleration.
C. / force = mass + acceleration.
D. / force = mass - acceleration.
16.A cart is rolling down a special ramp where there is no friction at all. What will happen if the amount of mass on the cart is increased?
A. / The cart will accelerate less.B. / The cart’s acceleration will not be affected.
C. / The cart will accelerate more.
D. / The cart will move at a constant velocity.
17.Cheung pushes on a toy car, and it accelerates at 0.22 meters per second per minute. Carlos pushes on the same toy car with twice as much force as Cheung. Compare the acceleration when Carlos pushes the car to when Cheung pushes the car.
A. / The acceleration is 1/4 as much.B. / The acceleration is 1/2 as much.
C. / The acceleration is twice as much.
D. / The acceleration is the same.
In the graph below, the acceleration of an object is plotted against the net force applied to the object.
Figure 6-2A
18.When a net force of 2 newtons is applied, the object graphed in Figure 6-2A accelerates at:
A. / 1 m/s2B. / 2 m/s2
C. / 3 m/s2
D. / 4 m/s2
19.The mass of the object being accelerated in Figure 6-2A is:
A. / 0.2 kgB. / 0.5 kg
C. / 1 kg
D. / 2 kg
20.Different forces were applied to each of two blocks, A and B. The graphs below show the relationship between the force and the acceleration for each block.
How does the mass of block A compare to the mass of block B?
A. / the same.B. / twice as great.
C. / half as great.
D. / four times as great.
21.A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the book from accelerating downward at 9.8 m/s2?
A. / The table presses back up on the book with an equal and opposite force of 20 newtons.B. / The table presses back up on the book with a force greater than 20 newtons.
C. / The table and the book together are accelerating downwards at 9.8 m/s2.
D. / The inertia of the book holds it up.
22.A rocket can fly into space because:
A. / when it is launched, the hot exhaust gases hit the ground and push the rocket forward.B. / the rocket pushes the exhaust gases backward, and there is an equal and opposite reaction pushing the rocket forward.
C. / when the gases are burning up, the mass of the rocket decreases, changing the amount of gravity on the rocket.
D. / the launch pad pushes the rocket forward like a slingshot.
23.Newton’s third law of motion involves:
A. / one force acting on one object.B. / a force pair acting on two different objects.
C. / a force pair acting on one object.
D. / unbalanced forces acting on many objects.
24.“Forces occur in pairs” is another way of stating Newton’s:
A. / first law of motion.B. / second law of motion.
C. / third law of motion.
D. / universal law of motion.
25.Even though every action force has an equal but opposite reaction force, they do not cancel one another and motion may still occur because the:
A. / action and reaction forces are applied to the same object.B. / action and reaction forces are applied to different objects.
C. / two forces have different magnitudes.
D. / two forces have equal magnitudes.
26.“Every action force creates a reaction force that is equal in strength and opposite in direction.” This statement summarizes Newton’s:
A. / 1st law of motion.B. / 2nd law of motion.
C. / 3rd law of motion.
D. / law of gravitational force.
27.According to Newton’s third law, an action reaction pair of forces have:
A. / equal magnitudes in the same direction.B. / different magnitudes in the same direction.
C. / equal magnitudes in opposite directions.
D. / different magnitudes in opposite directions.
28.The momentum of an object depends on what two factors?
A. / Force and accelerationB. / Mass and acceleration
C. / Force and velocity
D. / Mass and velocity
29.A kayaker paddles her boat through the water. Which of the following are an action/reaction pair in this situation?
A. / The force of the water pushing on the paddle and the force of the paddle pushing on the water.B. / The force of the paddle pushing on the water and the force of the canoe pushing through the water.
C. / The force of the water pushing on the paddle and the force of her hand pushing on the paddle.
D. / The force of her hand pushing on the paddle and the force of the boat pushing through the water.
30.A force of 50 newtons is exerted by a bat on a baseball. The force exerted by the baseball on the bat is:
A. / less than 50 newtons.B. / 50 newtons.
C. / more than 50 newtons.
D. / Cannot be determined from the data
Kyela and her brother are roller skating. Kyela as a mass of 60 kg and her brother has a mass of 30 kg.
Answer the following questions.
31.When Kyela pushes off her brother, how do their accelerations compare?
A. / Kyela accelerates faster than her brother.B. / Her brother accelerates faster than Kyela.
C. / They both have the same acceleration.
D. / Neither will accelerate, because they are traveling at constant velocity.
32.When Kyela pushes off her brother, how do their momentums compare?
A. / Kyela has a higher momentum.B. / Her brother has a higher momentum.
C. / Kyela and her brother have the same momentum.
D. / Neither has any momentum.
33.The equation to calculate momentum is:
A. / mass inertiaB. / mass ÷ velocity
C. / mass velocity
D. / mass acceleration
34.A 100-kg astronaut is floating in outer space. If the astronaut throws a 2-kilogram wrench at a speed of 10 meters per second, which best describes her velocity?:
A. / Less than 10 m/s in the same direction as the wrenchB. / Greater than 10 m/s in the same direction as the wrench
C. / Less than 10 m/s in a direction opposite to the wrench
D. / Greater than 10 m/s in a direction opposite to the wrench
35.You stand on a skateboard and push off the ground with one of your feet. The reason that the skateboard moves forward is that the force you apply to the skateboard:
A. / equals the force applied to you by the skateboard.B. / is larger than the force applied by you to the skateboard
C. / equals the force applied by the ground to the skateboard.
D. / is larger than the force applied by the ground to the skateboard.