PS Exam Review

A bicycle increases its speed as it travels from the top of a steep hill to the bottom. How is energy transferred during its travel?

• Kinetic energy is transformed into potential energy.

• It loses both kinetic energy and potential energy.

• Potential energy is transformed into kinetic energy.

• It gains both potential energy and kinetic energy.

If the diameter of a conductor in a circuit is doubled, how are the resistance and current in the circuit affected?

• The resistance decreases, causing the current to decrease.

• The resistance increases, causing the current to increase.

• The resistance decreases, causing the current to increase.

• 
  The resistance increases, causing the current to decrease.

Why does the weight of a solid object on the moon change when the same object is brought to Earth?

• because the force of gravity on the moon is different from that on Earth

• because the effects of air resistance are greater on the moon

• 
  because the density of the object on the moon is different

• because the mass of the object changes between the moon and Earth

Which is the name for the chemical formula PO₃?

• phosphate trioxide

• phosphorus trioxide

• phosphate oxide

• phosphorus oxide

If voltage remains constant, how would an increase in the surrounding temperature influence the resistance and current in a circuit?

• 
  It would decrease the resistance, causing the current to decrease.

• It would increase the resistance, causing the current to decrease.

• It would decrease the resistance, causing the current to increase.

• It would increase the resistance, causing the current to increase.

An object is traveling at a constant velocity of 20 m/s along a level, frictionless surface. How much force is required to maintain this motion?

• 20 N

• 0 N

• 2 N

• 9.8 N

This diagram represents a closed circuit with three identical lightbulbs.
If bulb Y stops working in the circuit, what will happen to bulbs X and Z?

• Bulb X will not glow, but bulb Z will glow.

• Bulb X and bulb Z will not glow.

• Bulb X and bulb Z will glow.

• Bulb X will glow, but bulb Z will not glow.

A man rides his bicycle 15 miles east and then turns around and rides 10 miles west before coming to a stop. What is his displacement?

• 25 miles west, because his displacement has the same magnitude as the total distance traveled

• 0 miles, because of his change in direction

• 5 miles east, because of his change in direction

• 15 miles east, because his displacement has the same magnitude as the initial distance traveled

A person receives a small shock when touching a metal car door. What conclusion can be made?

• Quarks were transferred.

• Protons were transferred.

• Electrons were transferred.

• Neutrons were transferred.

A box is pushed toward the right across a concrete floor. What can be concluded about the type and direction of friction applied to the box?

• Rolling friction acts on the box, and the direction of the friction is to the right.

• 
  Sliding friction acts on the box, and the direction of the friction is to the left.

• Sliding friction acts on the box, and the direction of the friction is to the right.

• Rolling friction acts on the box, and the direction of the friction is to the left.