Momentum
True or False: Momentum is a scalar quantity.
False!! MOMENTUM IS A VECTOR - IT HAS DIRECTION.
DOUBLE JEOPARDY!!!
A 2-kilogram object traveling 10 meters per second north has a perfect elastic collision with a 5-kilogram object traveling 4 meters per second south. What is the total momentum after collision?
0 kg m/s
True or False: Momentum is conserved during elastic collisions, but not during inelastic collisions.
False - Momentum is ALWAYS conserved for an isolated system.
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct and why?
A) The magnitude of the momentum change experienced by each one is inversely proportional to its mass.
B) The magnitude of the momentum change experienced by each one is directly proportional to its mass.
C) The truck experiences the greater magnitude momentum change.
D) The small car experiences the greater magnitude momentum change.
E) The small car and the truck experience the same magnitude momentum change.
E) The small car and the truck experience the same magnitude momentum change.
N3Law says that in an interaction between two objects, they each exert equal forces upon each other in opposite directions. Time duration of collision is same for both objects - thus, Fnet(t) is same.
A 50 kg child rides a 4 kg skateboard at a speed of 4.6 m/s. What is the total momentum of the child-skateboard system? Round to nearest whole number.
248 Ns
Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s. What speed does the 60-kg skater acquire? Round to two decimal places.
0.28 m/s
DOUBLE JEOPARDY!!!
Jennifer hits a stationary 0.20-kg ball, and it leaves her racket at 40 m/s. Time-lapse photography shows that the ball was in contact with the racket for 0.040 s.
What average force did the ball exert on the racket?
200 N
A 1200-kg car moving at 15.6 m/s suddenly collides with a stationary car of mass 1500 kg. If the two vehicles lock together, what is their combined velocity immediately after the collision? Round to nearest whole number.
7 m/s
A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound
4.4 kg ∙ m/s
Football player A tackles player B to the ground before player B can make a touchdown. Is this an example of an elastic or inelastic collision?
Inelastic - they "stick" together