7th Sci Motion, forces and energy

10 terms by mrsoc

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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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