Exploring Newton's Laws of Motion

Which of the following is Newton's First Law of Motion?

• An object in motion will stay in motion unless acted upon by an external force.

• Force equals mass times acceleration.

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

• Energy cannot be created or destroyed.

What is the formula for calculating force according to Newton's Second Law of Motion?

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

• An object at rest will stay at rest unless acted upon by an external force.

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

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

• The gravitational force between two objects is inversely proportional to the square of the distance between them.

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NGSS.MS-PS2-1

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

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A book is lying on a table. Which of the following forces is responsible for the book not falling through the table?

• Gravitational force

• Frictional force

• Normal force

• Tension force

Explain how Newton's Third Law of Motion applies when a swimmer pushes against the wall of a pool.

• The swimmer moves forward because the wall pushes back with an equal and opposite force.

• The swimmer remains stationary because the forces cancel each other out.

• The swimmer moves backward because the wall exerts a greater force.

• The swimmer moves forward because the water exerts a force on the swimmer.

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A rocket is launched upward. Describe how Newton's Third Law of Motion is demonstrated in this scenario.

• The rocket moves upward because the ground pushes it with an equal and opposite force.

• The rocket moves upward because the exhaust gases push downward, creating an equal and opposite reaction.

• The rocket remains stationary because the forces are balanced.

• The rocket moves upward because of gravitational force.

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

• A ball rolling on a flat surface eventually comes to a stop due to friction.

• A car accelerates when the driver steps on the gas pedal.

• A swimmer pushes water backward to move forward.

• A book remains at rest on a table until someone picks it up.