Force and Motion Test #1 Review

Force is measured in

• lbs

• kilograms

• Newtons

Newtons 3rd law states

• For every action there is an equal and opposite reaction

• if you hit me I will hit you back

• an object in motion will stay in motion forever

• Balanced
• Unbalanced

Complete the law:

For every action, there is an ____________ reaction.

• equal and opposite

• equal

• opposite

• bigger and better

A rubbing force that acts against motion between two objects and always slows an object down.

• velocity

• force

• friction

Which of the following is an example of an unbalanced force?

• 
• 
• 
• 

What is the magnitude of force on a 1000 kg elevator that is falling freely at 9.8 m/sec²

• 102.04 N

• 9,800 N

• 980 N

• 103 N

A 50 kg skater pushed by a friend accelerates 5 m/sec².  How much force did the friend apply?

• 45 N
• 15 N 
• 10 N
• 250 N

If a 2kg bird is pushed by the wind with a force of 2N, how fast does the bird accelerate?

• 1 m

• 2 m/s²

• 4m/s²

• 1 m/s²

If an object was accelerating at 5 m/s², and a net force of 10 newtons caused that acceleration, what was the object's mass?

• 50 kg

• 2 kg

• 0.5 kg

• 5 kg