Force & Motion

acceleration

rate of change of velocity

average Speed

Total Distance / Total Time = Average Speed

balanced forces

Equal forces acting on an object in opposite directions

constant speed

Speed that does not change

distance

a measurement of the space between two points

force

a push or pull exerted on an object

inertia

objects at rest continue to stay at rest

motion

A change in position.

net force

the combination of all forces acting on an object

newtons

The unit of measurement for force

normal force

The force exerted by a surface to support the weight of an object resting on it, acting perpendicular to the surface.

point of reference

a non-moving object in the background used in describing the motion of another object.

position

the location of an object

speed

distance travelled per unit time

unbalanced Forces

result in a net force on an object that can cause changes in motion

velocity

Speed in a given direction

Add forces when they act in __ direction.

same

Subtract forces when they act in directions.

opposite

Newton’s 1st Law of Motion

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

Newton’s 2nd Law of Motion

a stronger force makes an object accelerate more, and the heavier the object, the more force it takes to make it move (Force=mass x acceleration, F=ma)

Newton’s 3rd Law of Motion

the "action-reaction" law, meaning that for every action, there is an equal and opposite reaction