Summary-Motion and Forces
Anya knows the velocity of an object. What else does she need to know in order to find the object's
momentum?
A. its mass
B. its height
C. its density
D. its speed - (correct Answer) - A. its mass
A bicycle has a momentum of 36 kg • m/s and a velocity of 4 m/s. What is the mass of the bicycle?
A. 9 kg
B. 32 kg
C. 40 kg
D. 144 kg - (correct Answer) - A. 9 kg
Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep
constant for each object after the objects collide and bounce apart?
A. velocity
B. mass
C. momentum
D. direction - (correct Answer) - B. mass
Newton's first law of motion was a giant leap forward in scientific thought during Newton's time. Even
today, the idea is sometimes difficult at first for people to understand. Which statement is the best
example of an object and motion that would make it hard for people to accept Newton's first law?
A. A rolling ball eventually slows down and comes to a stop.
B. A wagon must be pushed before it begins to move.
, C. The heavier the load in a cart, the harder the cart is to turn.
D. A box does not move when pushed equally from opposite sides. - (correct Answer) - A. A rolling ball
eventually slows down and comes to a stop.
An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)
A. 0.83 N
B. 1.2 N
C. 11 N
D. 30 N - (correct Answer) - D. 30 N
When discussing Newton's laws of motion, which terms do people most likely use when talking about
Newton's third law of motion?
A. "force" and "acceleration"
B. "inertia" and "force"
C. "action" and "reaction"
D. "mass" and "inertia" - (correct Answer) - C. "action" and "reaction"
A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton's laws of
motion to explain the skydiver's motion?
A. An upward force balances the downward force of gravity on the skydiver.
B. The skydiver's inertia is zero, which no longer allows for acceleration.
C. An unbalanced force pulls the skydiver toward the ground.
D. The mass of the skydiver is so great that there is no acceleration. - (correct Answer) - A. An upward
force balances the downward force of gravity on the skydiver.
Which statement correctly describes gravity?
A. an attractive force that acts between all objects through contact
B. an attractive force that acts between all objects without contact
C. a repulsive force that acts between all objects through contact
Anya knows the velocity of an object. What else does she need to know in order to find the object's
momentum?
A. its mass
B. its height
C. its density
D. its speed - (correct Answer) - A. its mass
A bicycle has a momentum of 36 kg • m/s and a velocity of 4 m/s. What is the mass of the bicycle?
A. 9 kg
B. 32 kg
C. 40 kg
D. 144 kg - (correct Answer) - A. 9 kg
Jerome solves a problem using the law of conservation of momentum. What should Jerome always keep
constant for each object after the objects collide and bounce apart?
A. velocity
B. mass
C. momentum
D. direction - (correct Answer) - B. mass
Newton's first law of motion was a giant leap forward in scientific thought during Newton's time. Even
today, the idea is sometimes difficult at first for people to understand. Which statement is the best
example of an object and motion that would make it hard for people to accept Newton's first law?
A. A rolling ball eventually slows down and comes to a stop.
B. A wagon must be pushed before it begins to move.
, C. The heavier the load in a cart, the harder the cart is to turn.
D. A box does not move when pushed equally from opposite sides. - (correct Answer) - A. A rolling ball
eventually slows down and comes to a stop.
An object has a mass of 5 kg. What force is needed to accelerate it at 6 m/s2? (Formula: F=ma)
A. 0.83 N
B. 1.2 N
C. 11 N
D. 30 N - (correct Answer) - D. 30 N
When discussing Newton's laws of motion, which terms do people most likely use when talking about
Newton's third law of motion?
A. "force" and "acceleration"
B. "inertia" and "force"
C. "action" and "reaction"
D. "mass" and "inertia" - (correct Answer) - C. "action" and "reaction"
A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton's laws of
motion to explain the skydiver's motion?
A. An upward force balances the downward force of gravity on the skydiver.
B. The skydiver's inertia is zero, which no longer allows for acceleration.
C. An unbalanced force pulls the skydiver toward the ground.
D. The mass of the skydiver is so great that there is no acceleration. - (correct Answer) - A. An upward
force balances the downward force of gravity on the skydiver.
Which statement correctly describes gravity?
A. an attractive force that acts between all objects through contact
B. an attractive force that acts between all objects without contact
C. a repulsive force that acts between all objects through contact
