Simple Machines 4th Grade

Definition: a rope and wheel system that lifts and lowers a load.

• Force

• Inclined plane

• Pulley

• Wedge

An inclined plane wrapped around a rod; These are typically made of wood or metal with a wedge at the tip.

• Friction

• Screw

• Force

• Wedge

A push or pull that can cause an object to start moving, stop moving, or even change direction.

• Friction

• Shape

• Wedge

• Force

Forces that cancel each other out

• Pulley

• Balanced forces

• Unbalanced forces

• Lever

True or False: When objects of similar shapes are dropped, the time they take to fall is the same.

• False

• True

This is a force that resists the motion of two surfaces sliding across one another. It slows down objects in motion.

• Gravity

• Force

• Friction

• Inclined Plane

a stiff bar supported by a fulcrum that can lift or move loads.

• Force

• Lever

• Wedge

• Gravity

a ramp that connects a lower level to a higher level.

• Simple machine

• Duration of fall

• Inclined plane

• Wheel and axle

Causes changes in speed or direction of an object

• Pulley

• Lever

• Unbalanced forces

• Balanced forces

A combination of a wheel rotating around a rod that moves objects.

• Inclined plane

• Wheel and axle

• Duration of fall

• Simple machine