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Newton's laws of motion

8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.MS-PS2-1, NGSS.MS-PS2-2, NGSS.HS-PS2-1 · England: KS3 Physics: Motion and forces, KS4 Combined Science: Forces and motion

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1
Question 1
A passenger lurches forward when a bus brakes suddenly. Which law explains this?
- A. Newton's third law
- B. Newton's first law (inertia)
- C. Hooke's law
- D. Ohm's law
2
Question 2
Newton's laws: which statement is NOT true?
- A. A resultant force makes an object accelerate.
- B. Seat belts help stop passengers continuing forward in a crash.
- C. The two forces in a Newton's third law pair act on the same object.
- D. For every force there is an equal and opposite force on the other object.
3
Question 3
Newton's laws: which statement is true?
- A. The two forces in a Newton's third law pair act on the same object.
- B. A moving object needs a constant force to keep moving at steady speed in space.
- C. Heavier objects need less force to accelerate.
- D. An object at rest stays at rest unless a resultant force acts on it.
4
Question 4
A passenger lurches forward when a bus brakes suddenly. Which law explains this?
- A. Ohm's law
- B. Newton's first law (inertia)
- C. Hooke's law
- D. Newton's third law
5
Question 5
Newton's laws: which statement is NOT true?
- A. A moving object needs a constant force to keep moving at steady speed in space.
- B. Seat belts help stop passengers continuing forward in a crash.
- C. A resultant force makes an object accelerate.
- D. For every force there is an equal and opposite force on the other object.
6
Question 6
Newton's laws: which statement is true?
- A. A moving object needs a constant force to keep moving at steady speed in space.
- B. The two forces in a Newton's third law pair act on the same object.
- C. Heavier objects need less force to accelerate.
- D. A bigger resultant force gives a bigger acceleration for the same mass.
7
Question 7
The same force is applied to an empty trolley and a full one. Which accelerates more?
- A. the full trolley
- B. both the same
- C. neither moves
- D. the empty trolley
8
Question 8
Newton's laws: which statement is NOT true?
- A. For every force there is an equal and opposite force on the other object.
- B. A resultant force makes an object accelerate.
- C. An object at rest stays at rest unless a resultant force acts on it.
- D. The two forces in a Newton's third law pair act on the same object.
9
Question 9
Newton's laws: which statement is true?
- A. The two forces in a Newton's third law pair act on the same object.
- B. An object at rest stays at rest unless a resultant force acts on it.
- C. Heavier objects need less force to accelerate.
- D. A moving object needs a constant force to keep moving at steady speed in space.
10
Question 10
A rocket pushes exhaust gas downwards. Why does the rocket go up?
- A. Gravity switches off
- B. The air underneath lifts it like a balloon
- C. The gas pushes the rocket upwards with an equal and opposite force
- D. The rocket becomes lighter than air
11
Question 11
Newton's laws: which statement is NOT true?
- A. For every force there is an equal and opposite force on the other object.
- B. An object at rest stays at rest unless a resultant force acts on it.
- C. A resultant force makes an object accelerate.
- D. A moving object needs a constant force to keep moving at steady speed in space.
12
Question 12
Newton's laws: which statement is true?
- A. Heavier objects need less force to accelerate.
- B. For every force there is an equal and opposite force on the other object.
- C. The two forces in a Newton's third law pair act on the same object.
- D. A moving object needs a constant force to keep moving at steady speed in space.
13
Question 13
A passenger lurches forward when a bus brakes suddenly. Which law explains this?
- A. Hooke's law
- B. Newton's third law
- C. Ohm's law
- D. Newton's first law (inertia)
14
Question 14
Newton's laws: which statement is NOT true?
- A. The two forces in a Newton's third law pair act on the same object.
- B. A resultant force makes an object accelerate.
- C. An object at rest stays at rest unless a resultant force acts on it.
- D. Seat belts help stop passengers continuing forward in a crash.
15
Question 15
Newton's laws: which statement is true?
- A. Heavier objects need less force to accelerate.
- B. A bigger resultant force gives a bigger acceleration for the same mass.
- C. A moving object needs a constant force to keep moving at steady speed in space.
- D. The two forces in a Newton's third law pair act on the same object.
16
Question 16
A passenger lurches forward when a bus brakes suddenly. Which law explains this?
- A. Newton's first law (inertia)
- B. Ohm's law
- C. Newton's third law
- D. Hooke's law

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Answer key: Newton's laws of motion

1. B. Newton's first law (inertia)
2. C. The two forces in a Newton's third law pair act on the same object.
3. D. An object at rest stays at rest unless a resultant force acts on it.
4. B. Newton's first law (inertia)
5. A. A moving object needs a constant force to keep moving at steady speed in space.
6. D. A bigger resultant force gives a bigger acceleration for the same mass.
7. D. the empty trolley
8. D. The two forces in a Newton's third law pair act on the same object.
9. B. An object at rest stays at rest unless a resultant force acts on it.
10. C. The gas pushes the rocket upwards with an equal and opposite force
11. D. A moving object needs a constant force to keep moving at steady speed in space.
12. B. For every force there is an equal and opposite force on the other object.
13. D. Newton's first law (inertia)
14. A. The two forces in a Newton's third law pair act on the same object.
15. B. A bigger resultant force gives a bigger acceleration for the same mass.
16. A. Newton's first law (inertia)