PHYSICS QUESTIONS
TOPIC: MOMENTUM
01. A 70-kg man runs at a constant velocity of 2 m/s. What is his momentum?
(A) 35 kg m/s
(B) 68 kg m/s
(C) 70 kg m/s
(D) 72 kg m/s
(E) 140 kg m/s
02. A 10-N force is applied to a hockey puck over a period of 0.1 s. What is
the change in momentum of the hockey puck?
(A) 1.0 kg m/s
(B) 9.9 kg m/s
(C) 10 kg m/s
(D) 10.1 kg m/s
(E) 100 kg m/s
03. A 1,000-kg car moving at a constant velocity of 11.0 m/s strikes a concrete
barrier and comes to a complete stop in 2.0 s. What is the force acting on the
car?
(A) −5,500 N
(B) −180 N
(C) 0.02 N
(D) 180 N
(E) 5,500 N
04. A 1.0-kg ball moving at 10 m/s strikes a wall and bounces back. The
collision is perfectly elastic. What is the ball’s momentum after the collision?
(Assume a frictionless surface.)
(A) −100 kg m/s
,(B) −10 kg m/s
(C) −1.0 kg m/s
(D) 10 kg m/s
(E) 100 kg m/s
05. A 10-kg box is sliding across an ice rink at 10 m/s. A skater exerts a
constant force of 10 N against it. How long will it take for the box to come to a
complete stop?
(A) 0.5 s
(B) 1.0 s
(C) 10 s
(D) 50 s
(E) 100 s
06. Two balls of equal mass collide in a perfectly elastic collision. Ball A
moves to the right at 10 m/s. Ball B moves to the left at 5 m/s. After the
collision, Ball B moves to the right at 3 m/s. What is the velocity of Ball A after
the collision? (Assume a frictionless surface.)
(A) −10 m/s
(B) −8.0 m/s
(C) −5.0 m/s
(D) 2 m/s
(E) 3 m/s
07. A 140-kg fullback is running with the football at 10 m/s. A 70-kg defender
runs at him in the opposite direction at 5 m/s. The defender wraps his arms
around the fullback. What is the velocity of the two players after the
collision? (Assume a frictionless surface.)
(A) −10 m/s
(B) −5 m/s
(C) 0 m/s
(D) 5 m/s
(E) 10 m/s
08. There are two billiard balls each with a mass of 200 g. A pool player
shoots Ball A with a velocity of 1.0 m/s at Ball B, which is at rest. After the
collision, Ball A stops and Ball B travels off in a straight line. What is the
, velocity of Ball B after the collision? (Assume a frictionless surface.)
(A)−1.0 m/s
(B) −0.2 m/s
(C) 0 m/s
(D) 0.2 m/s
(E) 1.0 m/s
09. A bullet has a mass of 50 g and its momentum is 25 kg m/s. What is the
velocity of the bullet?
(A) 2 × 10−3 m/s
(B) 5 × 10−1 m/s
(C) 2.5 × 101 m/s
(D) 5 × 101 m/s
(E) 5 × 102 m/s
10.Two objects are moving around a fixed
reference point. Object 1 is located at 2.0 m (x1) and has a mass (m1) of 10
kg. Object 2 is located at 6.0 m (x2) and has a mass (m2) of 20 kg. Where is
the center of mass of the system?
(A) 2.1 m
(B) 4.0 m
(C) 4.7 m
(D) 5.0 m
(E) 5.9 m
11. A 150-kg halfback is running down the field carrying the ball at a velocity
of 5 m/s. A 50-kg receiver from the opposing team is running at him in the
opposite direction. The receiver hopes to tackle and stop him in an inelastic
collision. Will the receiver be able to stop him? And, if so, at what velocity must
he run?
(A) Yes, −15 m/s
(B) Yes, −10 m/s
(C) Yes, −5 m/s
(D) Yes, 0 m/s
(E) No, the receiver cannot stop the fullback
TOPIC: MOMENTUM
01. A 70-kg man runs at a constant velocity of 2 m/s. What is his momentum?
(A) 35 kg m/s
(B) 68 kg m/s
(C) 70 kg m/s
(D) 72 kg m/s
(E) 140 kg m/s
02. A 10-N force is applied to a hockey puck over a period of 0.1 s. What is
the change in momentum of the hockey puck?
(A) 1.0 kg m/s
(B) 9.9 kg m/s
(C) 10 kg m/s
(D) 10.1 kg m/s
(E) 100 kg m/s
03. A 1,000-kg car moving at a constant velocity of 11.0 m/s strikes a concrete
barrier and comes to a complete stop in 2.0 s. What is the force acting on the
car?
(A) −5,500 N
(B) −180 N
(C) 0.02 N
(D) 180 N
(E) 5,500 N
04. A 1.0-kg ball moving at 10 m/s strikes a wall and bounces back. The
collision is perfectly elastic. What is the ball’s momentum after the collision?
(Assume a frictionless surface.)
(A) −100 kg m/s
,(B) −10 kg m/s
(C) −1.0 kg m/s
(D) 10 kg m/s
(E) 100 kg m/s
05. A 10-kg box is sliding across an ice rink at 10 m/s. A skater exerts a
constant force of 10 N against it. How long will it take for the box to come to a
complete stop?
(A) 0.5 s
(B) 1.0 s
(C) 10 s
(D) 50 s
(E) 100 s
06. Two balls of equal mass collide in a perfectly elastic collision. Ball A
moves to the right at 10 m/s. Ball B moves to the left at 5 m/s. After the
collision, Ball B moves to the right at 3 m/s. What is the velocity of Ball A after
the collision? (Assume a frictionless surface.)
(A) −10 m/s
(B) −8.0 m/s
(C) −5.0 m/s
(D) 2 m/s
(E) 3 m/s
07. A 140-kg fullback is running with the football at 10 m/s. A 70-kg defender
runs at him in the opposite direction at 5 m/s. The defender wraps his arms
around the fullback. What is the velocity of the two players after the
collision? (Assume a frictionless surface.)
(A) −10 m/s
(B) −5 m/s
(C) 0 m/s
(D) 5 m/s
(E) 10 m/s
08. There are two billiard balls each with a mass of 200 g. A pool player
shoots Ball A with a velocity of 1.0 m/s at Ball B, which is at rest. After the
collision, Ball A stops and Ball B travels off in a straight line. What is the
, velocity of Ball B after the collision? (Assume a frictionless surface.)
(A)−1.0 m/s
(B) −0.2 m/s
(C) 0 m/s
(D) 0.2 m/s
(E) 1.0 m/s
09. A bullet has a mass of 50 g and its momentum is 25 kg m/s. What is the
velocity of the bullet?
(A) 2 × 10−3 m/s
(B) 5 × 10−1 m/s
(C) 2.5 × 101 m/s
(D) 5 × 101 m/s
(E) 5 × 102 m/s
10.Two objects are moving around a fixed
reference point. Object 1 is located at 2.0 m (x1) and has a mass (m1) of 10
kg. Object 2 is located at 6.0 m (x2) and has a mass (m2) of 20 kg. Where is
the center of mass of the system?
(A) 2.1 m
(B) 4.0 m
(C) 4.7 m
(D) 5.0 m
(E) 5.9 m
11. A 150-kg halfback is running down the field carrying the ball at a velocity
of 5 m/s. A 50-kg receiver from the opposing team is running at him in the
opposite direction. The receiver hopes to tackle and stop him in an inelastic
collision. Will the receiver be able to stop him? And, if so, at what velocity must
he run?
(A) Yes, −15 m/s
(B) Yes, −10 m/s
(C) Yes, −5 m/s
(D) Yes, 0 m/s
(E) No, the receiver cannot stop the fullback
