# Force and Motion Vocabulary

## 18 terms

### Speed

the distance an object travels in a certain amount of time (distance over time.)

### Acceleration

the rate at which velocity changes.

### Momentum

the speed that an object has when it moves.

### Meter stick

a tool for measuring length or distance

### Compass

a tool that shows direction by pointing to the north.

### Wave

a rhythmic disturbance that travels through space or matter.

### Force

a push or pull that causes a change in motion.

### Inertia

a characteristic of matter in which it will remain at rest unless a force acts upon it or if it is in motion, it will stay in motion unless a force acts upon it.

### Gravity

a force of attraction between objects.

### Gravitational Force

the force that attracts all objects on Earth to Earth.

### Friction

a force that opposes motion by rubbing.

### Fulcrum

the point on which a lever rests or turns. The support on which a seesaw balances.

### Inclined Plane

a ramp or sloping surface.

### Wheel and Axel

a wheel with a rod in the center.

### Lever

a bar that is used to lift an object; makes it easier to move an object.

### Gear

a set of wheels with teeth that fit together and pass on or change the movement of a machine.

### Pulley

a wheel with a grooved rim in which a rope or chain can run to help lift loads more easily.

### Magnetic

having the property of attracting iron and certain other materials.