Phisics QQQ
Lesson | Question | Answers |
1.1 | Name three stores of energy? | Chemical, Kinetic, Gravitational Potential, Elastic Potential, Thermal Energy, Magnetic, Eloctrostatic |
11 | Name 2 types of energy that is wasted in a car? | Thermal, chemical |
1.1 | Describe the energy transfer when bungee Jumping? | Kinetic to elastic potential to kinetic |
1.1 | What is energy measured in, In terms of unit? | Joules (i) |
1.2 | What does conservation of energy mean? | Energy cannot be created or destroyed only transferred |
1.2 | On a pendulum at what point would the maximum kinetic energy be present? | at the lowest point (pendulum is straight) |
1.2 | What is a closed system? | Energy cannot enter or leave the system |
1.3 | What is the formula for work done? | Work done = force x distance |
1.3 | What force does a brake pad use in order to slow down the car? | Friction between pad and tyre |
1.3 | Name the contact force that causes an object to slow down? | Friction |
1.3 | When is Work done? | When an object is moved by a force. |
1.4 | How can you calculate change of gravitational potential energy? | Change GPE = mass x Gravitational Field Strength x change in height |
1.4 | What is the definition for gravitational potential energy? | The potential energy an object dependant on its mass, the planet it is on (Its GFS) and its height from the ground. |
1,4 | Name one way to decrease the gravitational potential energy of an object? | Lower or drop it |
1.5 | What is the formula used to calculate elastic potential energy? | EPE = / x spring constant x extension? |
1.5 | What law can a ferce extension graph show? | Hooke's law |
1.5 What is the formula for Kinetic energy> 1.6 What does energy dissipation mean? | KE =½ x mass x velocity? Energy that dissipates spreads out and becomes less useful | |
1.6 1.6 | What does the term useful energy mean? What does the term wasted energy mean? | Energy transferred to where it is wanted to do the job that is wanted Is the energy that is not usefully transferred. |
1.7 | If the useful energy is 250J and the total energy is 2000J what is the efficiency? | 250/2000 = 0.125 X 100 = 12.5% |
1.7 | Name two examples of how you could improve efficiency? | Increase useful energy output Decrease total energy output |
1.7 | What does the term efficiency limit mean? | This is the maximum amount of energy transferred to useful energy within a closed system |
1.7 | What is the formula used to calculate efficiency? | Efficiency = useful energy / total energy(x100 for percent) |
1.8 | What is the useful energy in a kettle? | Thermal |
1,8 | What is the wasted energy in a car engine? | Thermal, energy transferred as sound waves |
1.8 | What is the useful energy in a TV? | Energy transferred as sound and light waves |
1.9 | What is power measured in, in terms of units? | Watts (w) |
1.9 | What is power? | The amount of energy supplied per second |
1.9 | What is the equation to calculate power? | Power (in watts) = Energy transferred to appliance (in joules) / time taken for the energy to be transferred(in seconds) |