Work, power and efficiency work, power and efficiency. Chapter 6 work, kinetic energy and potential energy. The motion must be considered in two parts, before and after the string breaks. In physics we say that work is done on an object when you transfer energy to that object. To calculate the work done on an object by a force. At the bowling alley, the ballfeeder mechanism must exert a force to push the bowling balls up a 1. Work w is the energy transferred to or from an object by means of a force acting on the object.
Calculate the amount of work done by the rocket on the car during the quarter mile run. The total work done on the shopping cart while it is moving at a constant velocity is zero. If one object transfers gives energy to a second object, then the first object does work on the second object. Power is the rate of transfer of energy or the rate of doing work. Energy capacity of doing work by a body is known as energy. This fact is referred to as the work energy principle and is. The further it moves under the influence of your force, the more work you perform. This fact is referred to as the work energy principle and is often a very useful tool in mechanics problem solving. Note energy possessed by the body by virtue of any cause is equal to the total work done by. The change in the kinetic energy of an object is equal to the net work done on the object. Doing work either transfers energy from one object to another or transforms it. A man squatting on the ground gets straight up and stand. Gravitational potential energy to kinetic energy transformation endofchapter test marking scheme.
Work is the measure of energy transfer when a force f moves an object through a distance d. But energy transformed work done energy is measured in joules j so nm must be the same unit as j. Work, energy, and power the physics classroom, 2009 page 2 the amount of work w done on an object by a given force can be calculated using. Conservation of energy links gpe, ke and work done. Pdf work, energy and power muhammad habibie academia. When a force causes a body to move, work is being done on the object by the force. Work, energy and power key concept energy is the ability to do work, and may be obtained in many forms. Note that the mass of the crate is not required to answer the question. Work definition if an object moves in response to your application of a force, you have performed work. At maximum compression, the box has a speed of zero.