Forces and Momentum

The  ability to resist a change in motion is known as...

• Impulse
• Inertia
• Mass
• Force

The units for force are...?

• Newton
• kg x m/sec
• Impulse
• kg / m / s / s

An object in motion will remain in motion.

• 1st Law
• 2nd Law
• 3rd Law
• Conservation of Momentum

If I push you, then you also will push me.

• 1st Law
• 2nd Law
• 3rd Law
• Conservation of Momentum

The momentum before and after a collision is the same.

• 1st Law

• 2nd Law

• 3rd Law

• Conservation of Momentum

Two objects of equal mass are given a push.  Object 1 accelerates faster than object 2.  What can be said about the forces causing the motion.

• The force on object 1 was greater than the force on object 2.
• The forces were equal on both objects
• The force on object 2 was greater than the force on object 1.
• The forces were equal, but the momentum was larger for object 1.

Coins are stacked on top of an index card which is placed over a cup. The index card is flicked and the coins...

• fall straight down due to 1st Law
• fly off due to 2nd Law.
• fly toward the flick due to 3rd Law
• The coins absorbe the momentum of the flick and fly off at an increased speed.

kg x m / sec.  These are the units for...

• momentum
• force
• acceleration
• velocity

Which of the following is NOT a Vector.

• Force
• Momentum
• Acceleration
• Speed

A red car is sitting still and gets hit by a blue car of equal mass going at a speed of 30 m/s.  After the collision, which car has the greater change in velocity?

• red car
• blue car
• they will be equal
• It could be either depending on the type of collision.