Honors Physics: Law of Conservation of Momentum

According to the law of conservation of momentum, which statement is true? -Momentum can be controlled but not conserved. -The initial momentum of a system is equal to the final momentum. -The initial momentum of a system is always lower than the final state. -The initial momentum of a system is always higher than the final state.

The initial momentum of a system is equal to the final momentum.

A construction truck collides with the back of a subcompact car. Which one has the larger change of velocity during the collision?

The small car has a larger change in its velocity.

Which of the following is the definition of the law of conservation of momentum? -The total momentum in a closed system is constant. -The total momentum passed from one object to another is a constant. -The total momentum in a closed system changes as objects collide. -Force is the product of mass and acceleration.

The total momentum in a closed system is constant

A construction truck collides with the back of a subcompact car. Which vehicle has the larger change in momentum during the collision?

They have the same change in momentum.

Which of the following leads to the conclusion that momentum is conserved? -relation between translation and rotation of an object that is rolling -proportionality between weight and mass -equivalence principle -equal magnitude and opposite direction of action-reaction pairs of forces

equal magnitude and opposite direction of action-reaction pairs of forces.

A single 1,000 kg train car moving at 3.0 m/s collides with the back of two 1,000 kg train cars linked together. It latches onto the car it strikes as the two parts of the coupled cars exert forces on each other. What is the speed of the cars immediately afterward? -1.5 m/s -0.0 m/s -1.0 m/s -3.0 m/s

p: linear momentum p(initial)=p(final) mv= 3m*v 1000(3)=3(1000)v v= 3000/3000 therefore v=1ms^-1