Work and Machines

The wedge, screw and lever are all___machines

• easy
• simple
• compound
• complicated

The mechanical advantage of a machine is the number of times a machine increases the __ exerted on the machine

• distance
• incline
• force
• work

The ideal mechanical advantage for an inclined plane is equal to the length of the incline divided by

• the slope of the incline
• the height of the incline
• the distance of the incline
• the length of the incline

Power is measured in units called

• watts
• joules
• newtons
• kilograms

A device that is twice as powerful as another can do ____the amount of work in the same amount of time

• 2x
• 4x
• 3x
• the same

Power is equal to ___divided by time

• force
• watts
• distance
• work

The ideal mechanical advantage of a wheel and axle is the radius of the wheel ___the radius of the axle

• divided by
• multiplied by
• added to
• subtracted from

If you exert a force of 6N to push a desk 10 meters, how much work do you do on the desk?

• 6 joules
• 10 joules
• 60 joules
• 4 joules

A simple machine that might be thought of as an inclined plane that moves is a

• screw
• pulley
• lever
• wedge

If tight scissors have an efficiency of 50%, half of your work is wasted due to

• distance
• work
• power
• friction