Table of Contents
What is the work done by friction in circular motion?
where θ is the angle between the radial line connecting the present position and the intital position of the object to the center of hoop. With this we have the frictional force as fk=μ(mgsinθ+mv2R), so that the total work done by friction is Wk=∫π/20μ(mgsinθ+mv2R)Rdθ.
How can work done by friction be zero?
Zero= When there is no force acting upon it there is no friction e.g an object which is stationary and has no force causing it to accelerate, so it therefore doesn’t have any forces (friction) acting upon it giving it a value of 0 and therefore would have zero work done by friction.
Does friction perform work?
Static Friction can Perform External Work As an internal force, static friction does zero net work. As an external force, however, static friction can do work. This may seem odd, since “static” generally implies no motion.
Why is the work done by friction?
This is because the force of static friction opposes our force. However, since the block does not move, the displacement is zero. Therefore, zero work is done by friction. Therefore, friction can do positive, negative as well as zero work.
Is work done in uniform circular motion?
In uniform circular motion, only the direction of the velocity is changing, because the force is at right angles to the movement. Since the speed (i.e. the magnitude of the velocity) is constant, no work is being done and the energy remains constant.
What is work done against friction give an example of it?
A car traveling at a constant speed along a level road is working against friction. All of the work being done is to overcome the friction of the wheels against the road, the car against air, and the friction of the moving parts of the car against one another. Compare this to a spacecraft flying to the Moon.
What is friction used for?
Friction is a resistance force that slows down or prevents motion, it is necessary for many applications where you might want to hold items or do things and prevent slipping or sliding. Friction is used in car brakes, when we walk or climb a hill, making a fire, skiing down a hill, and more.
Is friction work done?
Since, the direction of motion of the block and the direction of frictional force is opposite to each other, the work done by friction is negative. The work done by friction can also be zero. However, since the block does not move, the displacement is zero. Therefore, zero work is done by friction.