PS2.A Quiz

What is the unit of force in the International System of Units (SI)?

• Newton (N)

• Pascal (Pa)

• Joule (J)

• Watt (W)

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Which of the following describes Newton’s first law of motion?

• An object at rest stays at rest, and an object in motion stays in motion at constant velocity unless acted upon by a net external force.

• Force is equal to mass times acceleration (F = ma).

• For every action, there is an equal and opposite reaction.

• The acceleration of an object is proportional to the force acting on it and inversely proportional to its mass.

What is the acceleration due to gravity near the surface of the Earth?

• 9.8 m/s²

• 0 m/s²

• 1.62 m/s²

• 19.6 m/s²

Which factor affects the friction force between two surfaces?

• The mass of the objects

• The type of surface material

• The speed of the objects

• The acceleration of the objects

How does the gravitational force between two objects change if the distance between them is doubled?

• It remains the same.

• It becomes four times as strong.

• It becomes half as strong.

• It becomes one-quarter as strong.

What is the net force acting on an object if it is moving at a constant velocity?

• Zero

• The force is equal to its mass.

• It is equal to the force of gravity.

• It is equal to the applied force.

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A ball is thrown horizontally. Which force causes it to fall to the ground?

• Gravity

• Friction

• Inertia

• Centripetal force

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What is the relationship between mass and weight?

• Weight is equal to mass divided by gravitational acceleration.

• Weight is a measure of the gravitational force on an object.

• Mass is a measure of the gravitational force on an object.

• Mass and weight are the same.

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What is an example of Newton’s third law of motion?

• Pushing a car and it accelerating in the opposite direction

• A person walking, moving forward due to muscle contractions

• A rocket launching due to gas expulsion

• An object falling due to gravitational pull

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If two objects collide and stick together, what type of collision is it?

• Elastic collision

• Inelastic collision

• Perfectly elastic collision

• Explosive collision

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