Physical Science Review test

Front

Which phrase best describes a gravitational force?

Back

a force that pulls objects toward each other

Answer explanation

Gravitational force is best described as a force that pulls objects toward each other, making this the correct choice among the options provided.

Front

What force do maglev trains reduce by using magnets?

Back

friction

Answer explanation

Maglev trains reduce the force of friction by using magnets to levitate the train above the track, eliminating the need for wheels touching the ground.

Front

Why does the soccer ball move when Jimmie kicks it toward the goal?

Back

The kick serves as a contact force on the ball.

Answer explanation

The kick serves as a contact force on the ball.

Front

The picture below shows Magnet 2 being pushed toward Magnet 1. Which of the following will most likely happen to Magnet 1 as Magnet 2 is moved closer?

Back

Magnet 1 will move away from Magnet 2.

Answer explanation

Magnet 1 will move away from Magnet 2 due to repelling magnetic forces between the two magnets.

Front

Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you were to comb your hair and then hold the comb near your hair, strands of hair would move forward and appear to stick to the comb. How could the interaction between the hair and the comb be described?

Back

They attract each other because they have opposite charges.

Answer explanation

The hair and comb attract each other because they have opposite charges, causing the strands of hair to move forward and stick to the comb.

Front

A person sitting in a rolling chair at rest throws a basketball forward. Since the person and the rolling chair have a greater mass than the basketball, how will the person and the rolling chair respond?

Back

They will move backward at a lower speed than the basketball moves forward.

Answer explanation

The person and rolling chair will move backward at a lower speed than the basketball moves forward due to conservation of momentum.

Front

Four students push on a block of wood with the forces shown in the diagram below. Assume friction is negligible. If the block slides horizontally, what is the net force, in Newtons (N), acting on the block of wood?

Back

11 N to the right

Answer explanation

The net force is calculated by adding all the forces together. In this case, 25 N to the left and 7 N to the right cancel out, leaving a net force of 18 N to the right.

Tags

NGSS.MS-PS2-2

Front

Which of the following is true about these objects?

Back

Object 1 would have a steeper slope than Object 2 on a distance-time graph.

Answer explanation

Object 1 would have a steeper slope than Object 2 on a distance-time graph because it traveled the same distance in less time, indicating a higher speed.

Front

The diagram below shows a closed circuit. What type of energy is the energy in the battery transformed into?

Back

light energy

Answer explanation

The energy in the battery is transformed into electrical energy, which powers the circuit and produces light energy.

Front

Why were the screws warm to the touch after being removed from the wooden table using a drill?

Back

Mechanical energy from the drill was converted into thermal energy due to friction.

Answer explanation

Mechanical energy from the drill was converted into thermal energy due to friction.