Unit 4

A rocket taking off is an example of which of Newton's Laws of Motion?

• 1st

• 2nd

• 3rd

Using Newton's Second Law (F=ma), what is the force of an object with a mass of 30kg, accelerating at 5m/s2?

• 200N

• 150N

• 125N

• 100N

If you wanted to separate a piece of wood into two pieces which type of simple machine would you use?

• inclined plane

• wedge

• pulley

• lever

A handicap ramp for using wheelchairs is an example of which type of simple machine?

• inclined plane

• wedge

• pulley

• lever

A seesaw would be an example of which class of lever?

• 3rd class

• 2nd class

• 1st class

In which type of lever is the fulcrum in the middle?

• 3rd class

• 2nd class

• 1st class

If forces are balanced an object will

• neither

• stay still

• move

An object that is moving collides with a stationary object. What is true according to Newton's Third Law?

• Nothing will happen

• Each object exerts a force on the other, equal in magnitude and in opposite directions

• Each object exerts a force on the other, equal in magnitude and in the same direction

According to Newton's First Law of Motion, a ball that is rolling won't stop until a force is applied to it.

• true

• false

Why is a magnet considered an action-at-a-distance force?

• magnets must be large in size to experience a force between them

• magnets push each other apart to increase the force between them

• magnets do not have to touch each other to exert a force

• magnets must be far apart in order to exert a force