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Newton's Laws: 17 MCQs with answers

All 17 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything Flashcards · 18 Quick Revision · 14

Warm-up · 8 questions

Q1. According to Newton's third law, forces always occur in pairs. What is true about these paired forces?

Beginner
A They act on two different objects and have different magnitudes. B They act on the same object and cancel each other out. C They act on two different objects and are equal in magnitude but opposite in direction. D They act on the same object and add up to a net force.
Show answer & explanation

They act on two different objects and are equal in magnitude but opposite in direction.

Newton's third law states that for every action, there is an equal and opposite reaction. These forces act on two different objects, so they do not cancel each other.

Q2. When you push a table with your hands, what does the table do?

Beginner
A It applies a force on your hands in the opposite direction. B It applies a force on your hands in the same direction. C It does not apply any force on your hands. D It applies a force only if the table is heavy.
Show answer & explanation

It applies a force on your hands in the opposite direction.

The table exerts an equal and opposite force on your hands, as described by Newton's third law.

Q3. When you push the ground backward with your feet to walk forward, the ground pushes you:

Beginner
A downward B backward C upward D forward
Show answer & explanation

forward

The ground applies an opposite force on your feet, which is forward, helping you move forward.

Q4. The force applied by the ground on your feet while walking is in the form of:

Beginner
A normal force only B friction C gravity D air resistance
Show answer & explanation

friction

The ground's reaction force is friction, which acts forward on your feet when you push backward.

Q5. Grooves are made on the soles of footwear to:

Beginner
A increase friction B make them look good C decrease friction D reduce weight
Show answer & explanation

increase friction

Grooves increase the force of friction between the soles and the floor, preventing slipping.

Q6. Treads on tyres help to:

Beginner
A increase friction with the road B reduce fuel consumption C decrease friction with the road D make the vehicle lighter
Show answer & explanation

increase friction with the road

Treads increase friction between tyres and the road, improving grip and safety.

Q7. When you push a wall, the wall pushes you back. This is an example of:

Beginner
A Newton's third law B Newton's first law C Law of gravitation D Newton's second law
Show answer & explanation

Newton's third law

The wall exerts an equal and opposite force on you, demonstrating Newton's third law.

Q8. Action and reaction forces act on the same object and cancel each other out.

Beginner
A True B False
Show answer & explanation

False

Action and reaction forces act on two different objects, so they do not cancel each other.

Building up · 9 questions

Q9. In the activity with a wheeled chair and a table, when you push the table forward, the chair moves:

Intermediate
A backward B sideways C forward D does not move
Show answer & explanation

backward

The table pushes back on you with an equal and opposite force, causing the chair to move backward.

Q10. When you pull a table toward you while sitting on a wheeled chair, the chair moves:

Intermediate
A away from the table B toward the table C sideways D upward
Show answer & explanation

toward the table

The table pulls you forward (toward it) as a reaction to your pull, so the chair moves toward the table.

Q11. What would happen if there were no friction between your feet and the ground while walking?

Intermediate
A Nothing would change. B You would walk faster. C You would float upward. D Your foot would slip backward and you might fall.
Show answer & explanation

Your foot would slip backward and you might fall.

Without friction, your foot would slip backward when you push the ground, making it impossible to walk normally.

Q12. When you sit on a bicycle and push the ground backward without pedalling, the bicycle moves:

Intermediate
A forward B sideways C stays stationary D backward
Show answer & explanation

forward

The ground pushes you forward as a reaction, moving the bicycle forward.

Q13. Newton's third law states that for every action, there is an equal and opposite reaction. This means the action and reaction forces:

Intermediate
A have different magnitudes B act on the same object C act in the same direction D act on different objects
Show answer & explanation

act on different objects

Action and reaction forces always act on two different objects, which is why they do not cancel each other.

Q14. In the activity, when you push the table forward, the force exerted by the table on you is:

Intermediate
A smaller than your push B larger than your push C equal to your push but opposite in direction D equal to your push and in the same direction
Show answer & explanation

equal to your push but opposite in direction

Newton's third law says the reaction force is equal in magnitude and opposite in direction.

Q15. Which of the following is an example of Newton's third law in action?

Intermediate
A A ball rolling on a flat surface B A rocket launching upward C A magnet attracting a nail D A book resting on a table
Show answer & explanation

A rocket launching upward

A rocket pushes exhaust gases downward, and the gases push the rocket upward—an action-reaction pair. Other options involve balanced forces or single forces.

Q16. Walking on ice is difficult because:

Intermediate
A friction between feet and ice is very low B gravity is weaker on ice C ice is too hard D ice is too cold
Show answer & explanation

friction between feet and ice is very low

Low friction means your foot cannot push the ground effectively, so the reaction force is insufficient to move you forward.

Q17. Friction always opposes motion and never helps in movement.

Intermediate
A True B False
Show answer & explanation

False

Friction can help movement, such as when walking or driving, by providing the necessary reaction force.

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