constant speed

no motion

accelerating speed

decreasing speed

Force = mass x acceleration

If the net force of an object is zero, the motion of the object does not change

When an object applies a force on another object, the second object applies an equal but opposite force on the first object

A force that one object can apply to another object without touching it

the force that pushes perpendicular to the object's surface

an attractive force between all objects that have mass

the forces two objects apply to each other

1. Gravity

2. inertia

3. applied

4. normal

1. Friction

2. Weight

3. Normal

4. Gravity

1. Applied

2. Abnormal

3. Friction

4. Gravity

1. Gravity

2. Friction

3. Applied

4. Normal

Friction of an object that is not moving

When two solid surfaces slide over each other

when an object rolls across a surface

when a solid object moves through a fluid

sky diving

ice skating

standing still

running

When objects collide and stick together

When two objects collide and bounce off each other

the force that two objects apply to each other

fall with the same acceleration

Have no weight

fall at different speeds