What is the ratio of output force to input force in a machine called?

Mechanical advantage
Efficiency
Friction
Velocity ratio

Which simple machine consists of a rigid bar that pivots on a point?

Lever
Pulley
Wheel and axle
Inclined plane

What is the point around which a lever rotates?

Fulcrum
Pivot
Axle
Load arm

Which type of pulley system reduces the amount of force needed to lift a load?

Inclined plane
Fixed pulley
Movable pulley
Wedge

What is the formula for calculating mechanical advantage?

Which law of motion explains why a machine cannot be 100% efficient?

Law of conservation of energy

Which simple machine is a slanted surface used to raise objects?

Inclined plane
Wedge
Screw
Pulley

The combination of two or more simple machines is called what?

Compound machine
Complex lever
Simple pulley
Mechanical advantage