12.3: Newton's 3rd Law and Momentum

Multiple Choice

When a hammer exerts a force on the nail, the nail _________________________________________.

• exerts a smaller amount of force back onto the hammer

• exerts a larger amount of force back onto the hammer

• exerts the same amount of force back onto the hammer

• cries and cries and cries

Multiple Choice

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, opposite direction

• 200 Newtons, same direction

Multiple Choice

Action-reaction forces never cancel each other out because....

• they act on different objects

• they act on the same object

• they do not act on objects

Multiple Choice

Which of the following is the unit for momentum?

• kg·m/s

• kg·m

• kg·m/s²

• Momentum has no unit.

Multiple Choice

A 50 kg ball rolls east down the street at 5 m/s. Calculate the momentum of the ball. 

• 55 kg*m/s east

• 10 kg*m/s east

• 250 kg*m/s east

• 500 kg*m/s east

Multiple Choice

In any collision (crash) the ______ is ALWAYS constant

• Total Momentum
• total speed
• total Velocity
• Energy

Multiple Choice

When two objects collide, the P_before is ____________ the P_after.

• more than 
• less than 
• equal to
• unrelated to