Objective 3 Forces & Motion

What is Newton's Third Law?

• Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force
• Force = mass x acceleration
• For every action there is an equal and opposite reaction

The definition of momentum is

• Mass in Motion
• The size of an object
• The velocity of an object
• A comparison between two objects

The momentum of an object depends upon the object's ___________&_____________.  

• size and shape
• mass and speed
• mass and veloctiy
• mass and energy

The total momentum before a collision is _________ the total momentum after a collision.

• equal to 
• less than 
• more than
• It depends on the type of collision

Which of the following objects would have the most momentum?

• A 10 kg ball rolling down the hallway at 2 m/s.

• A 5 kg ball rolling down the hallway at 5 m/s.

• A 100 kg ball at rest in the corner of the hallway.

• A 10 kg ball rolling down the hallway at 1 m/s.

Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?

• car

• Bike

• Both has equal momentum

• Cannot predict

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

Which cat has more momentum? Cat 1 has a mass of 2 kg and a velocity of 10 m/s. Cat 2 has a mass of 4 kg and a velocity of 10 m/s.

• cat 1

• cat 2

The attractive force between two objects

• friction

• gravity

• momentum

• drag

The resistance to motion-occurs when two object rub against.

• friction

• gravity

• momentum

• drag