10 terms

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.