Another way of putting Newton's First Law of Motion (Inertia) is:

Another way of putting Newton's Second Law of Motion (F=ma) is:

Another way of putting Newton's Third Law of Motion is:

Newton's Third Law says that forces come in pairs. A table pushes up on the box resting on it. What opposing force pulls the box down onto the table?

Gravity exerts 80 N of force downward on a box at rest on a table. What is the normal force?

What force opposes sideways motion between two surfaces that are touching?

A person pushes hard against a big piece of furniture along the floor to the right and it barely moves. What force resists the movement?

Which of these forces is NOT a contact force?

Which of these forces IS a CONTACT force?

What is this diagram called?

The forces in this free-body diagram are unbalanced. What does that mean about the object's motion?

The forces in this free-body diagram are balanced. What does that mean about the object's motion?