Newton's Laws of Motion: 19 MCQs

All 19 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything Flashcards · 20 Quick Revision · 15

Warm-up · 8 questions

Q1. Which statement best describes Newton's first law?

Beginner

A Force equals mass times acceleration.

B Every action has an equal and opposite reaction.

C An object stays at rest or in uniform motion unless a net external force acts.

D Objects always slow down unless pushed.

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Q2. What is inertia?

Beginner

A The tendency of an object to resist changes in its motion

B The speed of an object in a straight line

C The total force acting on an object

D The gravitational force on an object

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Q3. A hockey puck slides across smooth ice with almost no friction. According to Newton's first law, what happens to its motion?

Beginner

A It immediately stops

B It speeds up on its own

C It keeps moving at nearly constant velocity

D It gradually slows down and stops

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Q4. Which equation represents Newton's second law?

Beginner

A $v = u + at$

B $W = mg$

C $p = mv$

D $\vec{F}_{\text{net}} = m\vec{a}$

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Q5. Which statement best describes Newton's third law?

Beginner

A Acceleration is inversely proportional to mass.

B An object at rest stays at rest unless a force acts.

C For every action force there is an equal and opposite reaction force.

D Force equals mass times acceleration.

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Q6. What does mass measure?

Beginner

A Inertia — resistance to acceleration

B The speed of an object

C The gravitational force on an object

D The net force on an object

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Q7. What is weight?

Beginner

A The net force on an object

B The gravitational force on a mass: $W = mg$

C The amount of matter in an object

D The resistance to acceleration

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Q8. Newton's second law is expressed as $\vec{F}_{\text{net}} = m\vec{a}$, where force is in newtons, mass in kilograms, and acceleration in m/s².

Beginner

A True

B False

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Building up · 6 questions

Q9. For a fixed mass, if the net force on an object is doubled, what happens to its acceleration?

Intermediate

A It halves

B It becomes zero

C It doubles

D It stays the same

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Q10. Two people push a box in opposite directions with equal force. What is the box's acceleration?

Intermediate

A Nonzero, in the direction of the stronger push

B Zero, because the box is too heavy

C Nonzero, because each person exerts a force

D Zero, because the net force is zero

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Q11. A $10\,\text{kg}$ box is pushed across a frictionless floor with a horizontal force of $30\,\text{N}$. What is its acceleration?

Intermediate

A $300\,\text{m/s}^2$

B $3\,\text{m/s}^2$

C $0.33\,\text{m/s}^2$

D $30\,\text{m/s}^2$

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Q12. Why don't action–reaction pairs cancel each other out?

Intermediate

A They only occur at rest

B They are not equal in magnitude

C They act on two different objects

D They act in the same direction

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Q13. In $F = ma$, which quantity should you use?

Intermediate

A Mass in kilograms

B Weight in newtons

C Mass in newtons

D Weight in kilograms

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Q14. Why do seatbelts protect passengers during a sudden stop?

Intermediate

A Because the seatbelt increases the car's acceleration

B Because the seatbelt reduces the car's mass

C Because the seatbelt pushes the body backward

D Because inertia keeps the body moving forward when the car stops

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Topper level · 5 questions

Q15. If friction of $10\,\text{N}$ opposes the $30\,\text{N}$ push on the $10\,\text{kg}$ box, what is the acceleration?

Advanced

A $1\,\text{m/s}^2$

B $4\,\text{m/s}^2$

C $3\,\text{m/s}^2$

D $2\,\text{m/s}^2$

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Q16. A car cruises at a steady speed on a flat road. What is the net force on it?

Advanced

A Equal to the engine force

B Zero, because velocity is constant

C Equal to the weight of the car

D Equal to the friction force

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Q17. A 15 kg cart is being pushed with a force of 60 N to the right, while a frictional force of 15 N opposes its motion. What is the cart's acceleration?

Advanced

A 1 m/s²

B 4 m/s²

C 5 m/s²

D 3 m/s²

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Q18. A 2000 kg car is traveling at a constant speed of 20 m/s on a flat road. If the engine provides a force of 500 N, what is the total resistive force acting on the car?

Advanced

A 2000 N

B 0 N

C 500 N

D 1000 N

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Q19. Two ice skaters, Skater A (mass = 50 kg) and Skater B (mass = 70 kg), push off each other. If Skater A accelerates at 2 m/s², what is the magnitude of the acceleration of Skater B?

Advanced

A 1.4 m/s²

B 1.75 m/s²

C 2 m/s²

D 1.43 m/s²

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