Thus 50 Joules of work was done by the archer on the bow which will be transferred to the arrow when it is released. The force causes energy to be transferred to the object and. The potential energy transferred to the load d.efficiency of pulley system. the energy transferred by the man to the pulley system in raising the load through 1 m c. Define power as work done per unit time and derive power as the product of force and velocity. Efficiency (useful output energy / total input energy) x 100. the energy stored in a bow when it is stretched.Įlastic potential energy is equal to the work done to stretch or deform the material.Īn Olympic archer applies a force of 100N in pulling back her bow by 0.5m. When a force acts on an object and causes it to move, we describe this as work done on the object. A 4 Pulley system is used to lift a mass of 10 kg If a 40 Newton force is applied by the man to lift this Mass through 1 M a.calculate the velocity ratio of system b. Potential energy is the energy associated with intermolecular forces. The elastic potential energy is, The spring constant k has units Newtons per meter,, and the potential energy unit is the Joule (J). This is the energy stored by a material or object as a result of deformation e.g. Whenever we lift up an object we are providing a force to act against gravity. The elastic potential energy can be defined using this equation for work done by the spring. We define this to be gravitational potential energy (PEg) put into, or gained by, the object-Earth system. PE = 3920000 Joules = 3920 kilojoules (kJ) The work done on the mass is then W Fd mgh. It is this worked that is done to the object that is transferred and stored as gravitational potential energy.Ĭalculate the gravitational potential energy of a skydiver with a mass of 80kg about to jump out of a plane at an altitude of 5000m? In order to raise an object to a certain height above the Earth's surface work is done on the object against the force of gravity. Like kinetic energy gravitational potential energy also depends on the mass of the object. Thus the higher an object is moved from the Earth's surface the more potential energy it will possess. The formula for gravitational potential energy is: In simpler terms it can be considered as the energy an object possesses due to its height from the Earth's surface. The potential energy is equal to the amount of work done to get an object into its position. This is the energy an object possesses by reason of its position in a gravitational field.
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