Work and energy Core • Relate (without calculation) work done to the

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Work and energy Core • Relate (without calculation) work done to the magnitude of a force and the distance moved Supplement • Describe energy changes in terms of work done • Recall and use ΔW = Fd = ΔE

GREEN SICK Gravitational Radiative (e-m waves) Electrical Elastic Nuclear Sound Internal (Thermal) Chemical Kinetic That’s it Really no other types exist Except maybe dark energy but that is another story

Energy transfers Write the 9 types of energy in a circle on a double page in your notebooks. Draw a straight line from one form of energy to any other and add an arrow Write on the arrow a device or phenomenon that causes that change.

Ek = ½ m v2 Kinetic Energy Moving bodies have it If the mass of a body is m and its velocity is v then its kinetic energy is …….. Ek = ½ m v2

Gravitational Potential Energy If the mass of a body is m and its height above a fixed position is h then its change in gravitational potential energy…………. Ep = mgh where g = the acceleration due to gravity

Work done and energy transferred are measured in joules (J) Work done and energy transferred are measured in joules (J). The work done on an object can be calculated if the force and distance moved are known. You should know, and be able to use, the relationship between work done, force applied and distance moved.

Background Work and energy are measured in the same unit, the joule (J). When an object is moved by a force, energy is transferred and work is done. But work is not a form of energy - it is one of the ways in which energy can be transferred.

The equation This equation shows the relationship between work done, force applied and distance moved: work done (joule, J) = force (newton, N) × distance (metre, m) The distance involved is the distance moved in the direction of the applied force.

Question A force of 10N is applied to a box to move it 2m along the floor. What is the work done on the box? W= Fd W=10x2 W=20J

Notes P78&79 Answer all questions

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