This document contains 15 multiple choice questions about physics concepts related to motion and friction. The questions cover topics such as weight in an accelerating elevator, forces, inertia, types of friction (kinetic, static, limiting), methods to reduce friction, centripetal force, Newton's third law of motion, and acceleration produced by a force. The correct answers are not provided.

1. Physics - Motion & Friction
1.What is the apparent weight of the person when the elevator is
accelerating downwards?
[A] equal to the actual weight
[B] greater than the actual weight
[C] less than the actual weight
[D] 0
2.The forces acting at a point are called as:
[A] Collinear forces
[B] Coplanar forces
[C] Concurrent forces
[D] Unit forces
3.The force acting on a body for a short time are called as:
[A] Average force
[B] Momentum
[C] Impulse
[D] Tension
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

2. Physics - Motion & Friction
4.Newton’s third law of motion applies to which of these forces?
[A] Gravitational
[B] Electric
[C] Magnetic
[D] All of the Above
5.The inablity of a body to change its state of rest or motion is known as:
[A] Force
[B] Momentum
[C] Displacement
[D] Inertia
6.Which of these is the cause of Friction?
[A] Roughness of surfaces in contact
[B] Force of adhesion between the molecules of the surfaces in contact
[C] Both a and b
[D] None of the above
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

3. Physics - Motion & Friction
7.What is the relationship between Kinetic and limiting friction?
[A] Kinetic friction is slightly greater than limiting friction
[B] Kinetic friction is slightly less than limiting friction
[C] Kinetic friction is equal to limiting friction
[D] No relationship
8.When one body is actually moving over the surface of other body, the
friction is known as:
[A] Kinetic friction
[B] Limiting friction
[C] Static friction
[D] Negative friction
9.The value of coefficient of limiting friction does not depend on which
of the following?
[A] nature of the surfaces in contact
[B] total area of the surfaces in contact
[C] material of the surfaces in contact
[D] All of the above
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

4. Physics - Motion & Friction
10.Which of the following is NOT a method to reduce friction?
[A] By lubrication
[B] By polishing
[C] throwing sand on the ground
[D] None of the above
11.Which of these is the force required to move a body uniformly in a
circle?
[A] Centrifugal force
[B] Centripetal force
[C] Kinetic force
[D] None of the above
12.The centripetal force and centrifugal force are ______:
[A] equal in magnitude and have same direction
[B] unequal in magnitude and have same direction
[C] equal in magnitude and have opposite direction
[D] unequal in magnitude and have opposite direction
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com

5. Physics - Motion & Friction
13.What is the rate of acceleration produced by 1 dyne force acting on a
body of mass 1 gram?
[A] 9.8 m s-2
[B] 1 m s-2
[C] 1 cm s-2
[D] 9.8 cm s-2
14.The Newton’s third law is applicable when:
[A] bodies are at rest
[B] bodies are in motion
[C] bodies are in the air
[D] bodies are at rest or in motion
15.The apparent weight of the body becomes zero in which of the
following cases in the elevator?
[A] during free fall of a body under gravity
[B] when elevator is accelerating downwards
[C] when elevator is at rest
[D] when elevator is accelerating upwards
Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com