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.

When you are standing up in a subway train, and the train suddenly stops, your body continues to go forward.

After you start up your motorbike, as you give it more gas, it goes faster.

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

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

As an ice skater pushes harder with his leg muscles, he begins moving faster.

When Jasmine, age 5, and her dad are skipping pebbles on the pond, the pebbles that Jasmine's dad throws go farther and faster than hers.

When you paddle a canoe, the canoe goes forward.

A little girl who has been pulling a sled behind her in the snow is crying because when she stopped to tie her hat on, the sled kept moving and hit her in the back of the legs.