Test Review - Newtons Law

Inertia depends on what

Mass

If the net force on an object is zero, the object must be…

at rest or at a constant velocity

An object is in equilibrium when…

the net force is zero

Newtons First Law states

an object at rest will stay at rest and an object in motion will stay in motion with a constant velocity (constant speed I a straight line) unless the net force changes

Newtons Second Law states

the acceleration of an object I directly proportional to the net external forces, proportional to the mass ( acceleration is caused by net force)

Newtons third law states

if two objects interact the magnitude of the force simultaneously exerted on object 2 by “object 1” and these forces are in the opposite direction

for every action there is an equal and opposite reaction

forces exist in pairs (action-reaction pair)

A car pushes on the road, what is the reaction force?

the road pushes the car forward

kinetic friction acts when 

objects are moving

If friction increases, acceleration…

decreases

What is the acceleration if the net force is 0

there is no acceleration

static equilibrium

object is not moving

dynamic equilibrium

object moves at constant velocity (no

speeding up or slowing down)