Take this Exam: GED and HiSET science — physical science | Zestly

Question 1

A person is standing on a skateboard and pushes against a wall, causing the person to move backward. Which of the following illustrates Newton's third law in this scenario?

Accepted Answer

The wall pushes back on the person with an equal force

Answer

The person moves because the wall has no friction

Answer

The person pushes the wall with more force than the wall pushes back

Answer

The wall exerts no force because it is stationary

Question 2

A wooden crate is pushed across a rough floor and eventually comes to a stop. Why does the crate stop moving?

Accepted Answer

Friction acts in the opposite direction of the motion

Answer

Gravity pulls the crate downward

Answer

The inertia of the crate causes it to stop

Answer

The force of the push was not strong enough

Question 3

A hair dryer is plugged in and switched on. Warm air comes out of the nozzle. Which description traces the energy correctly, from the wall socket to the air?

Accepted Answer

Electrical energy becomes heat in the coil and motion in the fan, and the moving air carries that heat out of the nozzle.

Answer

Motion from the fan is converted into the electrical energy that the heating coil then uses.

Answer

Chemical energy stored in the dryer becomes electrical energy, which becomes light.

Answer

Thermal energy already in the room is collected and concentrated by the nozzle, with no electrical energy involved.

Question 4

An object has 100 Joules of potential energy at the top of a cliff. If it falls and there is no air resistance, how much kinetic energy will it have just before it hits the ground?

Answer

50 Joules

Answer

200 Joules

Answer

0 Joules

Answer

100 Joules

Question 5

You feel the warmth of a campfire while sitting several feet away. Which type of heat transfer is primarily responsible for this?

Answer

Convection

Answer

Radiation

Answer

Insulation

Answer

Conduction

Question 6

Two strings of lights each hold three bulbs. On the first string the bulbs are wired in series; on the second they are wired in parallel. One bulb on each string burns out. What happens?

Answer

On both strings every bulb goes dark, because a burnt-out bulb always breaks the circuit.

Answer

On the series string the remaining two burn brighter; on the parallel string the remaining two go dark.

Answer

On the series string the other two go dark; on the parallel string the other two stay lit.

Answer

On both strings the remaining bulbs stay lit, because current always finds another way through.