| What is the principle of conservation of energy? | Energy can not be created or destroyed; it can only be converted from one form to another |
| A bow and arrow are pulled and soon enough flies in the air. What equation is used to show that the energy throughout the bow and arrow is the same? | Ee+Ek=constant |
| A child drops a football and soon enough drops and hits the ground. What equation is used to show that the energy throughout the football is the same? | Ek+Ep=constant |
| A child drops a football and soon enough drops and hits the ground. What happens to the energy stored as it hits the ground? | Ep decreases, Ek increases |
| When the boy drops the football, the ball falls but had a few bounces against the rock. Why does the ball still bounce, however gets slower? | The Ep and Ek gets lower and some of the energy which the ball originally had, get transferred to the surrounding air (and thermal energy in the ball itself) whilst it falls. |
| What is dissipate mean? | spread out |
| What is air resistance? | A type of friction between air and another material |
| How is energy dissipated in a cog? | Kinetic energy gets transferred to thermal energy so the energy will rise up and cause energy to the surroundings. |
| How is thermal energy lost through the walls of a house? | The thickness |
| What prevents the maximum speed of a car? | Friction |
| What is the energy transfer if a car is moving at a constant speed? | Chemical energy is transferred to its thermal energy |
| A plane takes off. How is its energy being transferred? | The chemical energy of fuel of a plane is transferred to its kinetic and gravitational potential energy |
| How does the energy in the plane is given to the surrounding and the air? | Air resistance |
| How is energy dissipated in a circuit? | Electrical resistance |
| What is the energy transfer in a circuit? | Chemical energy is transferred to electromagnetic energy, heat energy and light energy |
| Animals can also lose energy with being on fire or thermal energy. How can this happen? | Conduction |
| How can useful heat energy be dissipated? | All the thermal energy released by fire gets transferred to the surroundings |
| How can we reduce amount of energy dissipated from a system? | Lubrication |
| How can lubrication reduce amount of energy dissipated from a system? | It reduces the friction between the moving parts of the machine |
| How can using wheels reduce the amount of energy dissipated from a system? | It decreases the friction between an object and the surface over whch it is moving |
| How can making vehicles more streamlined reduce the amount of energy dissipated from a system? | It reduces the amount of air resistance exerted on them |
| How can using low resistance cable in an electric current reduce the amount of energy dissipated from a system? | It reduces the amount of energy dissipated as heat |
| How can adding thermal insulation to a building reduce the amount of energy dissipated from a system? | It reduces the rate at which thermal energy is transferred from it |
| How can a home be insulated? | Cavity wall insulation |
| If the thermal conductivity of a material was lower, what will this mean? | the lower the rate of heat transfer |
| What is efficiency? | The ratio of the useful power output to the total power output |
| What is the equation for efficiency? | useful output energy transfer/total input energy transfer |
| Efficiency decimal goes from what? | 0-1 |
| Efficiency percentage goes from what? | 0-100 |
| True/ false - no device is 100% efficient and the wasted energy is usually transferred to the useless thermal energy store | True |
| What is a U-value? | Energy per second which is passing through 1m^2 of material with temperature difference across it of 1C |
| What can a U-value be measured in? | J |
