Understanding Forces and Orbits

What happens to an object if a force is applied in the same direction as its motion?

• The object will stop.

• The object will speed up.

• The object will slow down.

• The object will change direction.

What is the effect of a sideways force on an object?

• It speeds up the object.

• It changes the object's direction.

• It stops the object.

• It slows down the object.

Why does a ball on a string move in a circle?

• The string pushes the ball.

• The ball is pushed by the air.

• The string pulls the ball sideways.

• The ball has no force acting on it.

What would happen if you could throw a rock hard enough from a cliff?

• The rock would fall straight down.

• The rock would go into orbit.

• The rock would stop in mid-air.

• The rock would fly off into space.

What keeps the moon in orbit around the Earth?

• The push from solar winds.

• The Earth's magnetic field.

• The moon's own gravity.

• The sideways force of Earth's gravity.