Collisions
Does it Conserve or Not?
Impulse
Momentum Conceptual
100
A 50 kg skater at rest on a frictionless rink throws a 2 kg ball, giving the ball a velocity of 10 m/s. What is the skater’s subsequent motion?
-0.4 m/s
100
What type of collision is momentum conserved?
All types
100
A ball with a mass of 0.57 kg and a speed of 7.0 m/s collides perpendicularly with a wall and bounces off with a speed of 4.1 m/s in the opposite direction. What is the impulse acting on the ball?
-6.27 Ns
100
A spring is compressed between two objects with unequal masses, m and M, and held together. The objects are initially at rest on a horizontal frictionless surface. When released, which object is moving faster immediately after?
Mass m.
200
A tiny fly hits a car head on and splats. Which experiences a higher change in momentum, the car or the fly?
Both the same.
200
What type of collision is energy conserved?
Elastic
200
During the battle on Planet Namek, Goku delivers a high-speed punch to Frieza’s face. Frieza, who has a mass of 500 kg, is initially hovering stationary in mid-air. Goku’s fist makes contact with Frieza for a brief interval of 0.02 seconds. Immediately after the impact, Frieza is sent flying backward with a velocity of 80 m/s.
Calculate the impulse delivered to Frieza by Goku's punch and determine the average net force exerted on Frieza during the contact time.
40,000 N*s
2,000,000 N
200
A student initially at rest on a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which object will have a greater magnitude of momentum after the throw?
Both will have the same momentum.
300
Two balls hit each other head on. One ball has a mass of 3kg and is moving to the left at a speed of 3m/s. The other ball has amass of 2kg and is moving to the right at speed of 2m/s. If the first ball rebounds with a speed of 1.5m/s, how fast is the second ball moving after the collision?
-4.75 m/s
300
A ball is thrown upward and hits a piece of falling gum and they get stuck together. Is energy conserved?
No
300
A car of mass m, traveling at speed v, stops in time t when maximum braking force is applied. Assuming the braking force is independent of mass, what time would be required to stop a car of mass 2m traveling at speed v?
2t
300
Two objects, A and B, have the same momentum. B can have more kinetic energy than A if it has what?
More Speed than A.
400
During a high-speed pursuit through Savanna Central, Officer Judy Hopps is driving her 1,200 kg ZPD Interceptor eastward at 30 m/s when a distracted Rhino driving a 4,800 kg SUV pulls out of a shop parking lot traveling westward at 10 m/s, resulting in a perfectly elastic head-on collision. Assuming the two vehicles bounce off one another with no loss of kinetic energy to heat or deformation, calculate the final velocity of Judy’s Interceptor and the Rhino’s SUV immediately after the impact.
Judy = -34 m/s
Rhino = 6 m/s
400
An open train car on a level track is rolling without frictional loss through a vertical downpour of rain. As the car rolls, a huge amount of rainwater accumulates in the car. What happens to the kinetic energy of the cart? Is the energy conserved?
It decreases, energy is not conserved
400
If a car, of mass 500kg, is initially moving with a speed of 2m/s, what is the speed of the car after 1 second? (Use graph for reference)
12 m/s
400
A small beanbag and a bouncy rubber ball are dropped from the same height above the floor. They both have the same mass. Which one delivers the greater impulse to the floor when it hits?
The bouncy ball
500
A 15.0 kg penguin waddling east at a velocity of 7.0 m/s collides with a stationary 10.0 kg penguin. After the collision the 15.0 kg penguin is traveling at a velocity of 4.2 m/s 20.0 degrees S of E.
What is the speed and direction of the 10kg penguin after the collision? And is energy lost in this collision?
5.1 m/s 25 degrees N of E
Inelastic, K loss of 110J
500
Two balls hit each other head on. One ball has a mass of 3kg and is moving to the left at a speed of 3m/s. The other ball has amass of 2kg and is moving to the right at speed of 2m/s. If the first ball rebounds with a speed of 1.5m/s. Is kinetic energy conserved in this collision?
No
500
A tiny fly hits a car windshield. The fly was moving at a speed of 10 m/s towards the car. If the mass of the fly was 0.001 kg what is the impulse the car exerts on the fly if it splats on the windshield?
0.01 Ns
500
An empty sled of mass M moves without friction across a frozen pond at speed vo. Two objects are dropped vertically into the sled one at a time: first an object of mass m and then an object of mass 2m. Afterward the sled moves with speed vf. What would be the final speed of the sled if the objects were dropped into it in reverse order?
vf