Edit · AP Physics Force Quiz

Newton's First Law

1. An object at rest stays at rest

2. An object in motion will maintain a constant velocity unless acted upon by an external force

Law of Inertia

All objects want to keep doing what they are already doing

Newton's Second Law

F=ma

Newton's Third Law

1. For every action force, there is an equal and opposite reaction force

2. All forces come in pairs

Newtons are _______ when the force acts in the ___________ direction of the object's momentum

negative, opposite

Mass

A measure of the amount of matter in an object

Weight

A measure of the gravitational force exerted on an object.

Gravitational Force is

Weight

When asked about the reading of a scale, look for...

Normal Force

Elevator Problems

If acceleration is upwards, then...

Net Force is upwards

Elevator Problems

If acceleration is downwards

Net Force is downwards

When two forces aren't directly going against each other

Find Fy and Fx to get resultant velocity from hypotenuse

Resultant Force requires...

An angle

How to find an angle with only sides

Inverse Trig

If ∑F=0

Opposite forces cancel out

If stuck, set ∑F (which is ma) equal to

The sum of individual forces