What happens when work is done against a frictional force?

If a force acts on an object and causes it to move along a surface work is done on the object; it will also be opposed by friction between the surface and the object. Thus, we may say that the work is done ‘against’ the friction since they act in opposing directions.

Is work done by friction positive or negative?

The force of friction opposes the displacement (always), and does negative work.

What is friction on horizontal plane?

Consider a particle of mass M, which is on a rough horizontal plane. Given a horizontal force of magnitude S is applied (as in Figure 1), then assuming the particle remains in equilibrium, the magnitude of the frictional force, F, opposing any motion, will be equal to S, i.e. F = S.

Is work done against friction same as work done by friction?

When the body is stationary, work done by friction is equal to work done against friction. Work done by friction never increases work done against friction.

What is the difference between work done against friction and work done against gravity?

If there is no motion produced in the body, the work becomes zero. When we lift something then it is work done against gravity and when we slide something then it is work done against friction.

What is the effect on kinetic energy due to work done by the body against friction?

Friction always opposes motion. A body does work against friction at the expenses of its kinetic energy. Hence, the work done by a body against friction always results in loss of kinetic energy.

What happens to an object when net work is done upon the object by external forces?

When net work is done upon an object by an external force, the total mechanical energy (KE + PE) of that object is changed. If the work is positive work, then the object will gain energy. If the work is negative work, then the object will lose energy. In such cases, the object’s energy changes form.

Is friction force negative?

Students must note that generally friction is considered to be a dissipative force in nature that generally acts opposite to the direction of motion of an object and tries to decrease its kinetic energy. Hence, in general friction does negative work.

What will happen if the friction force is negative?

If the friction is negative then the direction will be the same as you rub an object against another object.

Is friction to horizontal force?

There are two horizontal forces – friction and the applied force.

Which friction is the force of friction experienced by a body when it is in motion?

dynamic friction
When a body is moving relative to another body, the friction experienced by the body is dynamic friction.

What is the work done against friction force on a surface?

Since the surface is frictionless, there’s no work done against friction force. Since the motion (and hence the surface) is horizontal, there’s no change in potential energy. But nothing is said about the nature of the motion.

What is the force of friction on a body of 5kg?

A body of mass 5kg is placed on a horizontal plane. It is found that a force of 10N applied horizontally to the body is just about to move it. Calculate the coefficient of static friction between the body and the plane.

What is the force required to pull a body up an inclined plane?

If we neglect friction between the body and the plane – the force required to move the body up an inclined plane can be calculated as A body with mass 1000 kg is located on a 10 degrees inclined plane. The pulling force without friction can be calculated as

What is the force pushing the body along a horizontal surface?

The force pushing – or pulling – a body along a horizontal surface can be expressed as Q = F cos α (1)