Free Force and Motion MCQs with Answers
1,416 Force and Motion MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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1,416 questions · page 58 of 71
- A. 10Ns
- B. 40 Ns
- C. 20 Ns
- D. 80N
Explanation: Area of the triangle shown in the figure would give change in momentum. Area of triangle =1/2 (F) (t) Area=1/2(20)(4) =40Ns.
Correct answer: 40 Ns1142. In projectile motion the
- A. Acceleration is parallel (or antiparllel)to the velocity.
- B. Acceleration is vertical, while the velocity can be in any direction.
- C. Acceleration is prependicular to the velocity.
- D. Acceleration is vertical and the velocity is horizontal.
Explanation: The horizontal velocity of a projectile is constant (a never changing in value).
Correct answer: Acceleration is vertical, while the velocity can be in any direction.- A. 7 m/s north
- B. 43 m/s north
- C. 7 m/s south
- D. 20 m/s north
Explanation: car is moving with decreasing velocity thus it has negative acceleration.
Correct answer: 7 m/s north- A. Zero
- B. 0.5 N s toward wall
- C. 0.5 N s away from wall
- D. 3.5 N s away from wall
Explanation: Pi= mvi= (1)(2) = 2 N s Pr=mvf=(1)(-1.5) =- 1.5 N s △P = mvf - mvi = - 1.5 - 2 = - 3.5 N s
Correct answer: 3.5 N s away from wall- A. A bicycle, when its speed changes from rest to 2.5 m/s in 2 s
- B. A car, when its speed changes from rest to 15 m/s in 5s
- C. A lorry, when its speed changes from rest to 20 m/s in 15s
- D. A motorbike, when its speed changes from rest to 50 m/s in 10s
Explanation: Acceleration = (Vi -Vf)/t - (50 - 0)/10 = 5 ms-2. So, the motorbike travels with an accleration of 5ms-2. Hence, option D is correct.
Correct answer: A motorbike, when its speed changes from rest to 50 m/s in 10s- A. 45o
- B. 65°
- C. 55o
- D. 70o
Explanation: Range = (Vi2 sin(2θ))/g Since Vi and g will remain constants in both cases range = sin(2θ) = sin(2x35) = sin(70) = 0.9397 and sin(2 x 55)…
Correct answer: 55o- A. 8 s
- B. 10 s
- C. 12 s
- D. 15 s
Explanation: When two objects are traveling in opposite directions the relative velocity adds up.
Correct answer: 10 s- A. 10 mls
- B. Zero
- C. 36m/s
- D. Infinite
Explanation: Both man and car have the same speed. So, their relative speed will be zero.
Correct answer: Zero- A. At rest
- B. Move with velocity comparable to velocity of Light
- C. Moving slowly
- D. High velocity
Explanation: Newton's laws are adequate for speeds that are low compared with the speed of light.
Correct answer: Move with velocity comparable to velocity of Light- A. Chance of collision
- B. Velocity
- C. Force acting
- D. Imuplse
Explanation: The average force generated in a collision is equal to the momentum change during the collision divided by the time interval in which…
Correct answer: Force acting- A. the action force is greater than the reaction force
- B. they are on different bodies
- C. they are in the same direction
- D. the reaction force exists only after the action force is removed
Explanation: For every action there is a reaction. This action and reaction are equal magnitude but opposite in direction.
Correct answer: they are on different bodies- A. its acceleration
- B. Instantaneous velocity
- C. variable velocity
- D. zero velocity
Explanation: Uniform velocity means that the velocity of body remains same at any instant. So, Instantaneous velocity = average velocity
Correct answer: Instantaneous velocity- A. R30 = R60
- B. 2R30 = R60
- C. R30 = 2R60
- D. R30 = R60 if initial velocity are same
Explanation: The range of projectile at 30° and 60° will be the same, if they are thrown at same speed.If two bodies thrown at same speed at angles…
Correct answer: R30 = R60 if initial velocity are same- A. variable acceleration
- B. uniform acceleration
- C. uniform velocity
- D. increasing acceleration
Explanation: Uniform acceleration means that the acceleration of body remains same at any instant.
Correct answer: uniform acceleration- A. 50kgm/s
- B. 100kgm/s
- C. 300kgm/s
- D. 1000kgm/s
Explanation: Step 1: Acceleration calculation Applying Newton's second law ∑F=ma ⇒F=ma ⇒10(N)=20(kg) a ⇒a=0.5m/s2 Step 2: Final speed Since…
Correct answer: 100kgm/s- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: When an object is thrown vertically upward its velocity decreases to zero and then it moves downward its velocity increases in reverse…
Correct answer: Option C- A. 15 m/s
- B. 2 m/s
- C. 30 m/s
- D. 0 m/s
Explanation: Explanation is given below. numerical type question so only one answer.
Correct answer: 15 m/s- A. The same speed
- B. Double the velocity of incident particle
- C. Zero velocity
- D. Bounce back with same velocity
Explanation: m1 >> m2 initial v2 is zero after collision v2 = 2v1 as m1 moves with v1 and is heavier than m2
Correct answer: Double the velocity of incident particle- A. 22.5m
- B. 25 m
- C. 25.5m
- D. 30m
Explanation: Explanation is given below. remember that displacement is always the shortest distance covered
Correct answer: 22.5m- A. 15m/s
- B. 10 m/s
- C. 7.5 m/s
- D. 5 m/s
Explanation: t= 75/15 = 5s, vavg = total displacement/time taken = A to D/ t = 25/5 = 5m/s
Correct answer: 5 m/s