# 7th Sci Motion, forces and energy

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### Motion

Change in position compared to the starting location. ex. moving train from a train station.

### Speed

Rate of motion (how fast or slow)
ex. 30 mph (miles per hour)

### Velocity

Speed in a given direction
ex. 45 mph North

### Acceleration

Increase or decrease in speed, change in direction.

### Gravity

Force that pulls all objects toward center of Earth.

### Force

Push or pull use on an object
ex. pull the door open, push the carriage.

### Friction

Force or resistance caused when 2 things rub together.

### Newton's First Law

An object in motion/rest stays in motion/rest until acted upon. ex. running down hall (in motion) you run into a door (door causes you to stop) books on a table (at rest) push them onto the floor (no longer at rest, moving)

### Newton's Second Law

Explains how force, mass and acceleration are related. ex. heavier objects require more force to move than lighter objects. To move a car you will need more force, to move a book across a table you will need less force.

### Newton's Third Law

for every action there is an equal but opposite reaction. ex. you roll a ball into a wall the ball will roll back away from the wall.

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