Force- Ch18,Lesson1

A push or pull that causes changes in motion

• push

• force

• pull

Nothing can change its position, speed, or direction unless a force acts on it.

• True

• False

A force that works against motion

• force

• magnets

• friction

Friction is present when surfaces touch

• True

• False

Friction can make ____ when you rub your hands together.

• water

• fire

• heat

The force acting to keep you on the Earth

• friction

• gravity

• force

When objects are falling, the speed does not change as they fall.

• True

• False

The speed of any falling object is about 10 meters per second after the first second.

• True

• False

When all objects in the universe pull on each other

• friction

• mass

• gravitational force

The gravitational force can be strong or weak, depending on the masses of the objects and the distance between them.

• True

• False