# 5th Grade Motion and Design

### 27 terms by maiden

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### motion

A change in position compared to the starting location, which happens over a period of time

### force

A push or pull that causes an object to move, stop, or change direction

### friction

A force that acts against or stops motion when two surfaces rub against each other.

### potential energy

The energy available as a result of an object's postition or condition.

### kinetic energy

Energy that an object has because it's moving.

### gravity

A force that pulls objects to the earth.

### weight

A measure of the amount of force gravity exerts to hold you to the ground.

### balanced force

Two pushes or pulls that cancel each other out, and do not cause a change in motion.

### unbalanced force

Two forces that are unequal (one is stronger than the other), and cause a change in motion.

### mass

The amount of matter (or stuff) in an object.

### contact force

A force between two objects that are touching each other.

### non contact force

Any force on an object by another object that is NOT touching it.

### energy

The ability to cause a change in matter.

### Newton's 1st Law

An object at rest, stays at rest and an object in motion tends to stay in motion, in the same direction and speed...unless acted on by a force.

### Newton's 2nd Law

An object's acceleration depends on the size and direction of the force, and the mass of the object.

### Newton's 3rd Law

For every action, there is an equal and opposite reaction.

### inertia

The tendency of an object to resist change in its movement, whether the object is moving or at rest.

### speed

A measure of an object's change in motion during a given time.

### momentum

A measure of how hard it is to slow down or stop an object.

### acceleration

The CHANGE in speed of an object in motion.

### simple machine

One of six basic devices that helps us do work.

### wedge

A simple machine made up of one or more sloping sides used for raising, holding, or splitting an object.

### wheel and axle

A simple machine made up of a large wheel connected by a smaller cylinder (axle) that is fastened to the wheel so they turn together.

### pulley

A simple machine made up of a wheel with a groove and a rim, through which a chain or rope makes lifting easier.

### lever

A simple machine made up of a bar that turns or moves on a fixed point called a fulcrum.

### screw

A simple machine made up of an inclined plane wrapped around a center pole; it holds things in place.

### inclined plane

A simple machine made up of a flat surface used to move things up and down.

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