Physics
The forces acting at a point are called as:
A. Collinear forces
B. Coplanar forces
C. Concurrent forces
D. Unit forces
C. Concurrent forces
The force acting on a body for a short time is called as:
A. Average force
B. Momentum
C. Impulse
D. Tension
C. Impulse
Newton's third law of motion applies to which of these forces?
A. Gravitational
B. Electric
C. Magnetic
D. All of the Above
D. All of the Above
The inability of a body to change its state of rest or motion is known as:
A. Force
B. Momentum
C. Displacement
D. Inertia
D. Inertia
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
C. Both a and b
When one body is actually moving over the surface of the other body, the friction is known as:
A. Kinetic friction
B. Limiting friction
C. Static friction
D. Negative friction
A. Kinetic friction
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
B. Total area of the surfaces in contact
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
D. None of the above
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
B. Centripetal force
What is the rate of acceleration produced by 1 dyne force acting on a body of mass 1 gram?
A. 9.8 m/s²
B. 1 m/s²
C. 1 cm/s²
D. 9.8 cm/s²
C. 1 cm/s²