VOCABULARY –Motion - when an object changes it position

Relative Motion - an object’s position change is described in terms of a reference point

Energy - a force can set an object into motion, stop it, or change the speed or direction of the object’s motion

Inertia - measures an object’s tendency to remain at rest or keep moving. More mass = more inertia

Distance - the entire path an object travels

Displacement – the distance and direction

between starting and ending position.

Example: You hiked 22 km over a mountain,

but you only are 12 km from where you started.

22km is you distance - displacement is 12km

from your original position.DISPLACEMENT

DISTANCE

DOS - Ringwords

Speed - is the distance traveled divided by the time needed to travel the distance

Constant speed - speed is the same at any given momentin time

Changing speed - speed at a particular instant in time

SPEED = DISTANCE (6 M) = 2 m/s TIME (3 S)

Velocity – is the displacement divided by the time.(Speed of a object and the direction of motion)

VELOCITY = DISPLACEMENT (1 km east) = .5 km/h eastTIME (0.5 h)

TAKE NOTES!

Acceleration - is the change in velocity divided by the amount of time required for the change to occur (speeding up or slowing down)

ACCELERATION = FINAL SPEED-INITIAL SPEED (8m/s - 2m/s)= 6m/s =.5m/s2

TIME (12s) 12s

Turning or changing direction is also acceleration.

Speed – distance something moves in a

certain timeVelocity – speed in a certain directionAcceleration – a change in speed a. Positive b. Negative You can change motion by changing the a. Speed (distance) b. Velocity (direction)