Question

Andrew pokes a marble, and the marble rolls down a ramp. The marble moves with speed. Which forces are acting on the marble in this situation?
When Andrew pokes the marble, he gives it [A tension/A friction/An applied/] force. As the marble rolls down the ramp, [Tension/Normal/Gravitational}, force pulls it down. The movement of the marble is slowed down by [Gravitational force/Friction/Elastic force] from the ramp

Answer 1

Answer:

When Andrew pokes the marble, he gives it An applied force. As the marble rolls down the ramp, Gravitational force pulls it down. The movement of the marble is slowed down by Friction from the ramp.

Explanation:

At the beginning, Andrew pushes the marble, so is applying a force, which is called applied. force. Then, this force is removed (as Andrew no longer touches the marble), but now the weigth of the marble (the gravitational force) pushes the marble down along the ramp, because the gravitational force acts downward, so it has a donward component along the ramp. At the same time, the surface of the ramp exerts a force of friction against the motion of the marble, and the frictional force is always directed against the motion of the object.

Answer 2

An applied force
gravitational force
friction