Force and Motion

Forces can make objects stop or start moving, slow down, speed up, or change direction.

• True

• False

Inertia causes a ball to return to Earth after you throw it.

• True

• False

Friction exists whenever two objects rub against each other

• True

• False

Friction causes objects to move faster or fly higher.

• True

• False

When you begin to slide down a slide, kinetic energy is converted into energy of motion.

• True

• False

Potential energy can be converted into kinetic energy.

• True

• False

A car’s engine works because of mechanical energy.

• True

• False

When you walk very slowly, you are doing work.

• True

• False

A wheel and axle is an example of a simple machine.

• True

• False

A motorcycle is an example of a complex machine.

• True

• False