Also know as Action and Reaction

F = ma

Forces can be expressed in units of

When you are riding in a car and the car suddenly stops, your body continues to go forward.

As the fuel in a rocket ignites, the force of the gas expansion and explosion pushes out the back of the rocket and pushes the rocket forward.

A frog leaping upward off the lily pad is pulled down by gravity and lands on another lily pad instead of continuing in a straight line.

After you start up you go kart, as you give it more gas, it goes faster.

A pitched baseball goes faster than one that is thrown gently.

A swimmer pushes water back with her arms, but her body moves forward.

As an ice skater pushes harder with leg muscles, the ice skater begins to move faster.

Rocky, age 5, and Parker, age 20, skip pebbles on the pond. The pebbles Parker throws go farther and faster than Rocky's.

When you paddle a canoe, the canoe goes forward.

A child is pulling a sled and stops. The sled kept moving and hit the child.