Newton's Second Law and MomentumPractice Questions & MCQs
Practice Newton's Second Law and 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 Second Law and MomentumQuiz - Solve & Score
Q1. A heavier truck and a lighter car apply equal braking forces. Which stops in a shorter distance, assuming same initial speed?
- A.Both stop in the same distance
- B.The truck, because it has more kinetic energy
- C.The car, because it has smaller mass and hence greater deceleration
- D.The truck, because it has more momentum
Answer: C. The car, because it has smaller mass and hence greater deceleration
F = ma => a = F/m. Same F, smaller m (car) => larger deceleration => shorter stopping distance.
Q2. A 5 kg body (rest) is pushed by 24 N with 4 N friction. How far does it move in 5 s?
- A.50 m
- B.60 m
- C.4 m
- D.20 m
Answer: A. 50 m
Quick parse - a typical physics numerical. The data on the table: 5 kg, 24 N, 4 N, 5 s. We are after the quantity the stem asks for. Tool of choice - v = u + a*t, F = m*a, PE = m*g*h, n = m/M. Rearrange it for the unknown before substituting. Numbers in: hence the required answer = 50 m. Common-sense check: the stem provides numerical data: 5, 24, 4, 5. Lock in option A) 50 m. Trap-watch: option B) '60 m' is incorrect: Wrong: a step was skipped or a unit not converted; option C) '4 m' fails since Wrong: this uses an incorrect intermediate result.
Q3. A 6 kg body (rest) is pushed by 24 N with 4 N friction. How far does it move in 5 s?
- A.41.667 m
- B.50 m
- C.3.333 m
- D.16.667 m
Answer: A. 41.667 m
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