science test unit 2

Newtons 1st law

An object in motion stays in motion.An object would only change its motion or direction if an external force is applied F=MA Force equals mass times acceleration

Newtons 2nd law

Force causes an object to accelerate. This also works for deceleration because a force in the opposite direction will slow down the object

Newtons 3rd law

Every action has an equal or opposite reaction, if you push something an equal push will come back to you

Ways for motion to change

• start moving

• Stop moving

• Speed up

• Slow down

• Change direction

Speed

how fast an object is moving in any direction

Velocity

speed in a certain direction and is measured in cm/s or cms per second

Variables

Independent- will change in test

Dependent- the result and will be observed

Control- the thing that won’t change

Force measurements

Force is measured in newton

Collisions

2 objects hitting each other, when hit the object will experience the same force in opposite directions

Friction

The opposite force to an object that is moving

Speed formula

Distance divided by time