Describing Energy.

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Presentation transcript:

Describing Energy

What is Energy? Energy is the ability to cause change. or….. The ability to do work. Energy is measured in the same units (Joules) as work because energy transfers work.

Different Forms of Energy Chemical potential energy Electrical energy Radiant energy

Types of Energy Kinetic Energy: the energy due to motion. Kinetic energy (J) = ½ x mass (kg) x [speed (m/s)]2

Calculating Kinetic Energy Example 1: A baseball with a mass of 0.15 kg is moving at a speed of 40.0 m/s. What is the baseball’s kinetic energy from this motion? 120 J Example 2: A jogger with a mass of 60 kg is moving forward at a speed of 3.0 m/s. What is the jogger’s kinetic energy? 270 J

Types of Energy Potential: the energy that is stored due to the interactions between objects. 3 Types: Chemical: energy due to chemical bonds Elastic: energy that is stored by compressing or stretching an object. Gravitational: energy that is due to the gravitational forces between objects

Calculating GPE Gravitational Potential Energy equation: GPE (J) = mass (kg) x Gravity (N/kg) x height (m) Example: A 4.0 kg ceiling fan is placed 2.5 m above the floor. What is the gravitational potential energy of the Earth-ceiling fan system? 98 J