Stemscopes Exam STEMscopes Forces and Motion 2

Question 1

Which of the following correctly describes velocity?

Accepted Answer

Speed with a specified direction

Answer

Velocity is a vector quantity that includes both speed (magnitude) and direction of motion.

Question 2

A distance-time graph shows a straight horizontal line. What does this indicate about the object's motion?

Accepted Answer

The object is stationary

Answer

A horizontal line on a distance-time graph means distance is not changing with time, indicating the object is stationary.

Question 3

A skateboarder rolls down a ramp and gains speed. Which energy transformation is occurring?

Accepted Answer

Potential energy to kinetic energy

Answer

As the skateboarder descends the ramp, gravitational potential energy is converted into kinetic energy, causing increased speed.

Question 4

Which factor does NOT directly affect the gravitational force between two objects?

Accepted Answer

Color of the objects

Answer

Gravitational force depends on the masses of both objects and the distance between them; color has no effect on gravity.

Question 5

A ball is thrown straight up into the air. At the highest point, the ball's velocity is:

Accepted Answer

Zero

Answer

At the highest point of its trajectory, the ball momentarily stops moving upward before falling back down, so its velocity is zero.

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