Games Physical Science Review

S8P3c How is an object's mass related to the force needed to accelerate the object?

• Mass determines the direction of the force needed

• Mass determines the kind of force needed

• The greater the mass, the greater the force needed

• The smaller the mass, the greater the force needed

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Two objects move away from each other. What happens to the gravitational attraction between them?

• It decreases

• It increases

• It becomes zero

• It does not change

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Which of the following statements about gravitational fields is true?

• Gravitational fields affect objects only when two objects are touching

• Gravitational fields affect objects only if the objects are not in contact

• Any object that has a mass is surrounded by a gravitational field

• Only very massive objects, such as Earth, are surrounded by a gravitational field

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When a rocket attempts to launch, its engine exerts a force downward. The rocket will not launch until the force of the engine is greater than the weight of the rocket. Why?

• The forces must be equal and balanced for the rocket to move

• The force of the engine must be twice as strong as the force of gravity for the rocket to move

• The rocket must move at a constant velocity to take off

• The force of the engine must be greater than the force of gravity to produce a net force upward.

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If an object falls far enough, it will reach terminal velocity. At this velocity, the force of air resistance is equal to the force of gravity on the object. The forces on the falling object are balanced. What will happen to the object and why?

• The object will accelerate toward the ground because gravity is pulling on it

• The object will hover in midair because the forces on it are balanced

• The object will fall at a constant velocity because the forces on it are balanced

• The object will decelerate until it reaches a full stop at the ground

Which of the following is evidence that a magnetic field surrounds a magnet?

• When a paper clip is placed on a bar magnet, it sticks to the magnet

• When the north poles of two magnets are brought near each other, they push apart without touching

• When a magnet is placed on a metal surface, it sticks to the surface.

• When you touch a metal doorknob, sometimes you receive a shock

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A magnet sticks to a table leg. Based on this information, which material could the table leg be made of?

• iron

• wood

• copper

• aluminum

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Two negatively charged particles are 1 millimeter apart. The electric force between them is 20 newtons. How will the amount of electric force between the particles change if the particles move closer together?

• The electric force will increase

• The electric force will decrease

• The electric force will stay the same

• The electric force will disappear

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Which material could be used for the core of an electromagnet?

• a wooden rod

• a vial of water

• a plastic rod

• a nickel rod

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What does the iron core of an electromagnet do?

• It acts as a conductor, allowing more current to flow through the electromagnet

• It acts as an insulator, protecting people from electric shocks

• It produces a magnetic field that adds to the overall magnetic field of the electromagnet

• It produces the electric current that passes through the wire coil.