Exam 3rd Marking Period

What type of simple machine is this?

• Lever

• Wheel and axle

• Inclined Plane

• Wheel and center

Work is only done when...

• An object is moving in the same direction that the force is applied.

• An object is moving.

• An object is moving in the opposite direction that the force is applied.

• An object is moving in any direction that the force is applied.

Is work done when a object is not moving?

• Yes

• No

Check if work is being done

• Someone holding a cup

• A falling cup because of gravity

• Pushing a wall

• Pushing a box to the right and moving it 1 meter

A girl is pushing a box with 10N and it moves 20m to the right. How much work is being done?

What simple machine is this?

• Lever

• Wedge

• Double Wege

• Inclined Plane

What is power?

• The amount of work done in a given time.

• The rate of doing work

• The ability to do work

What is a compound machine?

• Complex simple machines.

• Two or more simple machines.

• A combination of simple machines with gears.

If someone is doing 20J of work while shoveling snow in 20 seconds, how much power are they doing?

• 400 Watts

• 400 Joules

• 1 Watt

• 1 Joule

An inclined plane wrapped around a cilinder is a...

• lever

• wheel and axle

• compound inclined plane

• screw