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STUDYNEST · CLASS 11 PHYSICS

QUESTION PAPER 1

Chapter 4: Laws of Motion

Original chapter-specific practice paper

Maximum Marks: 40Suggested time: 60 minutes
Instructions: Answer all 20 questions. Marks are shown in brackets. Show calculation steps and units. Original practice questions, not an official examination paper.

Section A · 1-mark questions — 8 × 1 = 8 marks

  1. What measures translational inertia?[1]
  2. Second law at constant mass?[1]
  3. Do action-reaction forces act on one body?[1]
  4. Momentum formula?[1]
  5. Net force at equilibrium?[1]
  6. Kinetic-friction direction?[1]
  7. What provides centripetal force?[1]
  8. Maximum static friction?[1]

Section B · 2-mark questions — 6 × 2 = 12 marks

  1. 5 kg under net force 20 N: a?[2]
  2. 0.2 kg changes velocity +10 to −5 m/s: Δp?[2]
  3. 10 kg resting on level floor, g=9.8: N?[2]
  4. 2 kg at 6 m/s in radius 3 m: force?[2]
  5. 50 N for .2 s: impulse?[2]
  6. Why does swimmer push water backwards?[2]

Section C · 3-mark questions — 4 × 3 = 12 marks

  1. 6 kg trolley pulled 30 N, friction 6 N: a?[3]
  2. 0.15 kg ball at 20 m/s stops in .05 s: average force?[3]
  3. 10 kg block on frictionless 30° incline, g=10: a,N?[3]
  4. 2 kg at 5 m/s in radius 2.5 m: radial force?[3]

Section D · 4-mark questions — 2 × 4 = 8 marks

  1. 4 kg block released on frictionless 30° incline: speed after 3 s, g=10?[4]
  2. 0.5 kg ball rebounds +12 to −8 m/s in .1 s: average force?[4]

End of paper — review signs, units and working.

Open marking scheme and model answers

Attempt the paper before opening the key. Multi-mark answers show expected principles and results; award partial credit for valid intermediate steps.

Q1 · 1 mark
Mass.
Suggested allocation by section: 1-mark questions earn one mark for the correct fact, formula or unit; 2-mark questions normally award one mark for the principle/formula and one for the explanation or result; 3-mark questions award credit for the relation, working/reasoning and result with unit; 4-mark questions award credit for the principle, equation, working and final answer/interpretation. Accept equivalent correct methods.
Q2 · 1 mark
ΣF=ma.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q3 · 1 mark
No.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q4 · 1 mark
p=mv.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q5 · 1 mark
Zero.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q6 · 1 mark
Opposes relative sliding.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q7 · 1 mark
Inward resultant of actual forces.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q8 · 1 mark
μₛN.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q9 · 2 marks
4 m/s².
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q10 · 2 marks
−3 kg m/s.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q11 · 2 marks
98 N.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q12 · 2 marks
24 N.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q13 · 2 marks
10 N s.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q14 · 2 marks
Water exerts a forward reaction.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q15 · 3 marks
4 m/s².
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q16 · 3 marks
−60 N.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q17 · 3 marks
5 m/s²; 86.6 N.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q18 · 3 marks
20 N inward.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q19 · 4 marks
a=5 m/s²; v=15 m/s.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.
Q20 · 4 marks
Δp=−10 N s; force=−100 N.
Suggested credit: award marks for the correct principle, working and result as applicable; accept equivalent correct methods.