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# Chapter 10 Section 4

### Physics pgs. 353-359

momentum The product of an object's mass and velocity
Law of Conservation of Momentum The rule that in the absence of outside forces the total momentum of objects that interact does not change.
Why don't action and reaction forces cancel each other? Action-reaction forces do not cancel each other because they act on different objects
What must you know to determine an object's momentum? The object's velocity and mass.
What happens to the momentum of two objects after they collide? In the absence of friction, the total momentum is equal to the total momentum before the collision.
State Newton's third law of motion. if one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.
According to Newton's third law of motion, how are action and reaction forces related? Action and reaction forces are equal in strength and opposite in direction.
What would happen if you tried to catch a ball when you were standing on roller skates? When you caught the ball, you (with the ball in your hand)would move in the direction of the ball's initial motion.
What is momentum? Momentum is a characteristic of an object equal to the product of its mass and its velocity.
What is the momentum of a parked car? Because the velocity of a parked car is zero, its momentum is zero.
Why is it important for drivers to allow more distance between their cars when they travel at faster speeds? cars traveling at faster speeds have more momentum and are more difficult to stop than cars traveling at slower speeds.
what is conservation of momentum? Disregarding friction, the quantity of momentum is the same before and after objects interact.
The total momentum of two marbles before a collision is 0.06 kg m/s. No outside forces act on the marbles. What is the total momentum of the marbles after the collision? The total momentum stays the same; 0.06 kg m/s.