What does the law of the conservation of momentum state?
Responses
When two objects collide, they will keep their initial speeds.
When two objects collide, they will keep their initial speeds.
When two objects collide, the system's momentum remains the same.
When two objects collide, the system's momentum remains the same.
When two objects collide, the system's momentum changes.
When two objects collide, the system's momentum changes.
When two objects collide, they will each keep their initial momenta.
The correct response is: When two objects collide, the system's momentum remains the same.
What does Newton's third law say about why momentum is conserved in collisions?
Responses
Unequal forces act for unequal times, so the change in momentum for both objects must be equal.
Unequal forces act for unequal times, so the change in momentum for both objects must be equal.
Unequal forces act for unequal times, so the change in momentum for both objects must be unequal.
Unequal forces act for unequal times, so the change in momentum for both objects must be unequal.
Equal forces act for unequal times, so the change in momentum for both objects must be equal.
Equal forces act for unequal times, so the change in momentum for both objects must be equal.
Equal forces act in equal times, so the change in momentum for both objects must be equal.
The correct response is: Equal forces act for unequal times, so the change in momentum for both objects must be equal.
What makes some collisions elastic and others inelastic?
Responses
If the collision involves sticking together, it is elastic.
If the collision involves sticking together, it is elastic.
If there is no loss of kinetic energy in the collision, it is elastic.
If there is no loss of kinetic energy in the collision, it is elastic.
If the collision involves bouncing, it is elastic.
If the collision involves bouncing, it is elastic.
If there is energy lost in the collision to sound, heat, etc., the collision is elastic.
If there is energy lost in the collision to sound, heat, etc., the collision is elastic.
The correct response is: If there is no loss of kinetic energy in the collision, it is elastic.
How is momentum conserved in a Newton's cradle when one steel ball hits the other?
Responses
All the momentum starts in one ball, and after the collision, they share it.
All the momentum starts in one ball, and after the collision, they share it.
Momentum is not conserved in the steel balls of a Newton's cradle.
Momentum is not conserved in the steel balls of a Newton's cradle.
Both balls have momentum to start, and they share it after the collision.
Both balls have momentum to start, and they share it after the collision.
All the momentum starts in one ball, and after the collision, it is all in the other ball