Is work dependent on angle between force and displacement?
The acting force on the body : Work is directly proportional to the acting force at constant displacement and constant angle between force and displacement . The displacement of the body : Work is directly proportional to the displacement at constant force and constant angle between force and displacement .
How does force affect work?
Whenever a force is applied to an object, causing the object to move, work is done by the force. If the force has a component in the direction opposite to the displacement, the force does negative work.
What happens to work done to overcome friction?
Note that the work done by friction is negative (the force is in the opposite direction of motion), so it removes the kinetic energy.
What are two ways friction can be reduced?
By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
Can energy be lost to friction?
The mechanical energy of the system increases provided there is no loss of energy due to friction. The energy would transform to potential energy when the speed is increasing. The mechanical energy of the system remains constant provided there is no loss of energy due to friction.
What happens to energy due to friction?
Friction is a force that opposes motion. When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy. Friction can sometimes be useful.
What is the disadvantages of friction?
Three disadvantages of friction are : Friction produces heat which damages the moving parts of a machine. Friction produces wear and tear on the contacting surfaces. This reduces the life of machine parts, tyres and shoe soles. A lot of energy is wasted in overcoming the friction before an object starts moving.
Can friction ever do positive work?
If you observe the application of friction from a frame fixed to any one of the surfaces on which friction is acting, work can never be positive. Friction, by its nature, always acts opposing the relative motion between two surfaces. work done by friction can be zero, when there is no relative motion.
Which type of friction occurs when objects are not moving?
static
Is friction never useful?
Friction always slows a moving object down. Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding.
What is the three types of friction?
The reason we are able to control cars at all is because of friction between the car’s tires and the road: more accurately, because there are three kinds of friction: rolling friction, starting friction, and sliding friction.