Newton's Third Law and Conservation of MomentumPractice Questions & MCQs
Practice Newton's Third Law and Conservation of Momentum questions from How Forces Affect Motion (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Newton's Third Law and Conservation of MomentumQuiz - Solve & Score
Q1. What constant force changes a 2 kg body's velocity from 0 m/s to 15 m/s in 6 s?
- A.5 N
- B.6 N
- C.30 N
- D.35.1 N
Answer: A. 5 N
Q2. What constant force changes a 2 kg body's velocity from 0 m/s to 20 m/s in 6 s?
- A.6.667 N
- B.7.8 N
- C.40 N
- D.46.8 N
Answer: A. 6.667 N
Given 2 kg, 0 m, 20 m, 6 s, asked for the unknown. By v = u + a*t or s = u*t + (1/2)*a*t^2. v = u + a*t or s = u*t + (1/2)*a*t^2 → so the required answer = 6.667 N. write the kinematic relation that links the named quantities, e.g. Consequently option A) 6.667 N. Others fail: option B) '7.8 N' fails since Wrong: a step was skipped or a unit not converted; option C) '40 N' fails since Wrong: this uses an incorrect intermediate result.
Q3. What constant force changes a 2 kg body's velocity from 0 m/s to 25 m/s in 6 s?
- A.8.333 N
- B.9.75 N
- C.50 N
- D.58.5 N
Answer: A. 8.333 N
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