NEET Physics: rolling friction Practice Questions

Correct answer: B — A static friction force

For pure rolling motion, the friction force required to maintain the rolling condition is static friction, acting at the point of contact.

Correct answer: C — To provide a necessary resistance to motion

Rolling friction acts as a resistive force that must be overcome by the applied force to cause further motion, thus providing resistance to the vehicle's movement.

Correct answer: A — Rolling friction

Rolling friction is the resistance force experienced when a body rolls over a surface. It is a specific type of friction related to the rolling motion.

Correct answer: B — The interaction between the object's contact surface and the surface.

Rolling friction is caused by the deformation and interaction forces occurring at the interface between the rolling object and the surface due to the rolling action.

Correct answer: D — Deformation of the material

The energy loss associated with rolling friction is due to the work done in deforming the material at the contact surface, which results in energy dissipation (often as heat).

Correct answer: D — The point of contact must be instantaneously at rest.

Rolling without slipping occurs when the point of contact between the body and the surface is instantaneously at rest relative to the surface, which is the defining condition for rolling motion.

Correct answer: C — The object is rolling without slipping.

If the kinetic friction force is zero, it implies that the condition for rolling without slipping is perfectly maintained, meaning the object is rolling freely without slipping.

Correct answer: D — Rolling friction is a component of the total friction experienced during rolling motion.

Rolling friction is the specific friction arising from rolling, whereas kinetic friction is the general friction resisting sliding. Rolling friction is intrinsically related to the rolling condition.

Correct answer: A — the radius of the contact point

While rolling friction involves geometry, the magnitude of the friction force is related to the normal force, which in turn depends on the object's weight (mass) and the inclination, leading to greater friction for heavier objects.

Correct answer: A — Rolling friction.

Rolling friction is the specific friction force present when an object is rolling, and it is generally considered the dominant frictional force when rolling occurs, relative to pure sliding motion.

Correct answer: B — It is doubled

The force of rolling friction is proportional to the normal force times the coefficient of rolling friction, which depends on the area of contact, and thus on the radius. Doubling the radius generally increases the contact area or the mechanism of rolling resistance, leading to a change proportional to the geometry.

Correct answer: B — The contact point must be instantaneously at rest

Pure rolling occurs when the point of contact between the body and the surface is instantaneously at rest relative to the surface, meaning the rotation and translation are linked perfectly.

Correct answer: A — To oppose the rotation and motion, thus influencing translational motion.

Rolling friction opposes the motion and rotation. It accounts for the energy lost due to the deformation and interaction between the rolling body and the surface, thereby influencing the net translational motion.

Correct answer: C — The normal force

Rolling friction arises due to the deformation and interaction between the wheel and the surface, which is fundamentally linked to the normal force acting over the contact area.

Correct answer: D — It remains the same

Rolling friction is primarily dependent on the geometry of contact and the forces involved, which generally means that changes in radius affect the magnitude of the force, but the dependency is complex. For simple conceptual understanding at this level, the relationship is not strictly linear doubling or halving unless specific formulas are applied, so it is best considered dependent on the specific setup. (Conceptual focus: Rolling friction depends on geometry and the normal force distribution).