Applied Mechanics

Q1:

A retarding force on a body does not

A change the motion of the body

B retard the motion of the body

C introduce the motion of the body

D none of these.

ANS:B - retard the motion of the body

"retard the motion of the body" means to slow down or decrease the speed of the body's motion. This concept is often encountered in physics, particularly when discussing forces acting in opposition to the direction of motion. When a force acts to retard the motion of a body, it applies a resisting force that opposes the direction of the body's motion. This force decreases the body's velocity over time, eventually bringing it to a stop if the force persists. The amount of retardation depends on several factors, including the magnitude of the retarding force, the mass of the body, and the nature of the surface or medium through which the body is moving. In some cases, such as friction between surfaces, air resistance, or drag in fluids, retarding forces are present and can significantly affect the motion of an object. For instance, when a car's brakes are applied, the friction between the brake pads and the wheels generates a retarding force that slows down the car's motion. Similarly, when you throw a ball upwards, gravity acts as a retarding force, slowing the ball's upward motion until it stops momentarily before falling back down.



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