Understanding Force and Motion

Which of the following statements best describes Newton's First Law of Motion?

• An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

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

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

• The force of gravity acts between all masses.

According to Newton's Second Law of Motion, what is the formula for calculating force?

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Newton's Third Law of Motion states:

• An object in motion stays in motion.

• The acceleration of an object is proportional to the net force.

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

• Force equals mass times acceleration.

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• 500 N

• 1000 N

• 2000 N

• 4000 N

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A force of 50 N is applied to a mass of 10 kg. What is the acceleration of the mass?

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• 5 kg

• 10 kg

• 15 kg

• 20 kg

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Which of the following is an example of Newton's First Law?

• A book resting on a table.

• A rocket launching into space.

• A car accelerating on a highway.

• A ball bouncing off a wall.

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

• Kilogram (kg)

• Meter per second squared (m/s²)

• Newton (N)

• Joule (J)

If an object is moving with constant velocity, what can be said about the net force acting on it?

• The net force is zero.

• The net force is positive.

• The net force is negative.

• The net force is equal to the weight of the object.

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A 5 kg object is subjected to a net force of 20 N. What is its acceleration?

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