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Force and Laws of Motion Class 9 MCQ. We covered all the Force and Laws of Motion Class 9 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Force and Laws of Motion for NEET Students
A 20 kg cylinder slides across a surface at 12 m/s. If the coefficient of friction between the cylinder and the plane is 0.3, how far will it travel before coming to a stop? (Use g = 10 m/s²)
(A) 44 m
(B) 24 m
(C) 34 m
(D) 14 m
Option b – 24 m
Two forces of 10 N and 20 N act on an object. Which of the following cannot be the resultant force?
(A) 21 N
(B) 9 N
(C) 12 N
(D) 30 N
Option b – 9 N
A rope 10 m long has a force of 6 N applied at one end. What is the tension at a point 4 m from that end?
(A) 3.6 N
(B) 4.2 N
(C) 5.8 N
(D) 1.9 N
Option a – 3.6 N
A heavy chain lies flat on a table. If the coefficient of friction between the chain and table is 0.5, what is the maximum percentage of the chain’s length that can hang over the edge?
(A) 64.23%
(B) 15.14%
(C) 24.64%
(D) 33.33%
Option d – 33.33%
When a flat object slides across a flat surface, which force resists the motion?
(A) Rolling friction
(B) Static friction
(C) Sliding friction
(D) Normal force
Option c – Sliding friction
A 600 g ball is dropped from 5 m and then hit upwards to reach 20 m height. If a bat applies a 100 N average force, how long was the ball in contact with the bat? (Take g = 10 m/s²)
(A) 0.12 s
(B) 0.18 s
(C) 0.04 s
(D) 0.02 s
Option b – 0.18 s
A 5 kg object has momentum p = 20t + 10 (in SI units). What describes the motion of the object?
(A) Moving at constant speed
(B) Moving with constant acceleration
(C) Acceleration changing over time
(D) Decelerating
Option b – Moving with constant acceleration
A force of 20 N is applied to a 20 kg object for 5 seconds. What is the change in its momentum?
(A) 10 kg·m/s
(B) 40 kg·m/s
(C) 50 kg·m/s
(D) 100 kg·m/s
Option d – 100 kg·m/s
A 0.4 kg stone is thrown vertically upwards. What is the magnitude and direction of the net force acting on it?
(A) 3.92 N downwards
(B) 3.92 N upwards
(C) 1.24 N downwards
(D) 1.24 N upwards
Option a – 3.92 N downwards
A 0.1 kg ball hits a wall perpendicularly at 20 m/s and rebounds with the same speed. If the contact duration is 0.01 s, what force was applied?
(A) 300 N
(B) 100 N
(C) 200 N
(D) 400 N
Option d – 400 N
A 400 N ladder leans against a frictionless wall. If the floor’s coefficient of friction is 0.4, what is the maximum frictional force at the base?
(A) 400 N
(B) 160 N
(C) 180 N
(D) 200 N
Option b – 160 N
A 1 kg particle with 102 C charge slides down a 7 m inclined plane at 45°, in a uniform electric field of 100 V/m. If the friction coefficient is 0.1, how long does it take to reach the bottom?
(A) 1 s
(B) 1.41 s
(C) 3.2 s
(D) 1.91 s
Option b – 1.41 s
A wooden crate of 20 kg rests on a flat surface. A force of 42 N is needed to start sliding it. What is the static friction coefficient? (Take g = 10 m/s²)
(A) 0.1
(B) 0.21
(C) 0.42
(D) 0.54
Option b – 0.21
What happens to friction when two surfaces become extremely smooth?
(A) It increases
(B) It decreases significantly
(C) It stays constant
(D) It disappears
Option a – It increases
A 5 kg block lies on a rough surface (μ = 0.4). A 180 N force acts horizontally. What is its acceleration?
(A) 36 m/s²
(B) 7 m/s²
(C) 14 m/s²
(D) 32 m/s²
Option d – 32 m/s²
A car turns in a circular path at 15 m/s. What is the minimum radius of the turn? (μ = 0.8, g = 10 m/s²)
(A) 19.4 m
(B) 32.6 m
(C) 20.4 m
(D) 28.12 m
Option d – 28.12 m
A rocket expels gases at 100 m/s with a combustion rate of 10 kg/s. What is the thrust force?
(A) 800 N
(B) 9200 N
(C) 1000 N
(D) 1400 N
Option c – 1000 N
A 5 kg stone is raised 5 m using a rope that can bear up to 20 kg-weight. What is the minimum time to do this starting from rest? (g = 10 m/s²)
(A) 1 s
(B) 0.1 s
(C) 0.7 s
(D) 0.6 s
Option d – 0.6 s
A man inside a descending elevator holds a spring balance with a 2 kg load. If the elevator accelerates downward at 4.2 m/s², what does the scale read?
(A) 2 kg
(B) 2.9 kg
(C) 1.14 kg
(D) 0.75 kg
Option c – 1.14 kg
A bullet is fired from a 5 kg gun. The bullet’s speed is 250 m/s, and the gun recoils at -4 m/s. What is the mass of the bullet?
(A) 0.06 kg
(B) 0.08 kg
(C) 0.5 kg
(D) 0.01 kg
Option b – 0.08 kg
Assertion: Two objects of equal mass, one moving and one stationary, have the same inertia.
Reason: Inertia depends solely on mass and not on velocity.
(A) Both assertion and reason are true, and reason explains the assertion
(B) Both assertion and reason are true, but reason does not explain the assertion
(C) Assertion is true, reason is false
(D) Assertion is false, reason is true
Option a – Both assertion and reason are true, and reason explains the assertion
An object of mass M explodes into three parts. Two fragments (each M/4) move perpendicularly at 6 m/s and 8 m/s. What is the velocity of the third fragment?
(A) 1.5 m/s
(B) 2.0 m/s
(C) 2.5 m/s
(D) 5.0 m/s
Option d – 5.0 m/s
A man inside a train faces the engine and tosses a coin. If the coin lands behind him, what can be inferred about the train’s motion?
(A) Moving forward and speeding up
(B) Moving forward and slowing down
(C) Moving at constant forward speed
(D) Moving backward at constant speed
Option a – Moving forward and speeding up
Two forces at a point have a combined magnitude of 20 N. Their resultant is 15 N and perpendicular to the smaller force. What are the individual forces?
(A) 8.46 N, 11.54 N
(B) 2.11 N, 17.89 N
(C) 3.96 N, 16.04 N
(D) 4.37 N, 15.63 N
Option d – 4.37 N, 15.63 N
We covered all the force and laws of motion class 9 MCQ above in this post for free so that you can practice well for the exam.
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