Newton's first law says an object at rest stays at rest unless a resultant force acts, and the second law is written F = ma, so this Year 13 sheet opens with the two laws that govern motion. Weight appears as W = mg in the answers.
Key Takeaways
Rest stays rest without a resultant force (Q1).
Newton's second law is F = ma (Q2).
Weight is given as W = mg (Q4).
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.Newton's first law states that an object at rest stays at rest unless it is
(a) acted on by a resultant force(b) pushed gently(c) observed(d) weighed
2.Newton's second law is written as
(a) F = ma(b) F = m ÷ a(c) F = a ÷ m(d) F = m + a
3.Newton's third law states that forces occur in
(a) equal and opposite pairs(b) equal pairs(c) random pairs(d) large pairs
4.Weight is calculated using
(a) W = mg(b) W = m ÷ g(c) W = g ÷ m(d) W = m + g
5.A mass on a smooth horizontal surface has no friction. The resultant force equals
(a) the applied force(b) zero(c) the weight(d) the normal reaction
6.The normal reaction force acts
(a) perpendicular to the surface(b) along the surface(c) vertically downwards always(d) opposite to the weight always
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.State Newton's first law.
8.State Newton's second law.
9.State Newton's third law.
10.Write the formula for weight.
11.What is a resultant force?
12.When a car accelerates, which force drives the car forward?
13.What is the normal reaction force?
14.What is friction?
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.A force of 20 N acts on a mass of 4 kg. Using F = ma, find the acceleration.
16.A mass of 2 kg accelerates at 3 m/s². Using F = ma, find the force.
17.A 5 kg object is on Earth where g = 10 N/kg. Using W = mg, find its weight.
18.A resultant force of 12 N produces an acceleration of 4 m/s². Using m = F ÷ a, find the mass.
19.A 3 kg mass on a smooth surface has a force of 9 N applied to it. Using F = ma, find the acceleration.
20.A weight of 80 N acts on an object where g = 10 N/kg. Using m = W ÷ g, find its mass.
Answer Key
1. a) acted on by a resultant force
2. a) F = ma
3. a) equal and opposite pairs
4. a) W = mg
5. a) the applied force
6. a) perpendicular to the surface
7. Refer to solution guide.
8. Refer to solution guide.
9. Refer to solution guide.
10. Refer to solution guide.
11. Refer to solution guide.
12. Refer to solution guide.
13. Refer to solution guide.
14. Refer to solution guide.
15. Refer to solution guide.
16. Refer to solution guide.
17. Refer to solution guide.
18. Refer to solution guide.
19. Refer to solution guide.
20. Refer to solution guide.
End of Worksheet
People Also Ask
When does an object at rest start moving?
When a resultant force acts, option (a) in this worksheet (Q1).
How is Newton's second law written?
F = ma, option (a) in this worksheet (Q2).
What is weight equal to?
W = mg, option (a) in this worksheet (Q4).
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