Page 127 - Knowledge Organiser Yr7 24-25

2. Conservation of Energy
2.1
What store of energy decreases when a ball is dropped from above the ground?
Gravitational.
2.2
What store of energy increases when a ball is dropped from above the ground?
Kinetic.
2.3
What stores of energy are changing when a rollercoaster rolls down the track?
Gravitational decreases, kinetic increases.
2.4
What stores of energy are changing when a remote- controlled car starts moving?
Chemical decreases, kinetic increases.
2.5
What is meant by dissipated energy?
When energy is transferred to a non-useful store (wasted energy).
1. Energy and Energy Stores
1.1 What is energy? The ability to do work.
1.3 What is energy measured in? Joules (J).
1.2
Energy is conserved. What does this mean?
Energy can be stored or transferred but cannot be created or destroyed.
1.4
Give five examples of energy stores.
Kinetic, chemical, thermal, elastic, gravitational.
1.5
What store of energy would an object have if it was moving?
Kinetic.
1.6
What store of energy does a fuel have?
Chemical.
1.7
What store of energy increases with temperature?
Thermal.
1.8
What store of energy would a stretched or extended object have?
Elastic.
1.9
What store of energy would an object have when it is raised above the ground?
Gravitational.
1.10
Give an example of an object with a kinetic store of energy.
A moving car.
1.11
Give two examples of objects with chemical stores of energy.
Batteries, food.
1.12
Give an example of an object with a large thermal store of energy.
A cup of tea.
1.13
Give two examples of objects with elastic stores of energy.
A stretched elastic band, a squashed football.
1.14
Give an example of an object with a gravitational store
of energy.
A box on a high shelf.
2.6 In most cases what is the cause of dissipated energy? Friction.
3. Energy Transfers
3.1
Name four ways energy can be transferred.
Electrically, mechanically, by heating and by radiation.
3.2
What type of energy transfer involves charge flowing through a circuit?
Electrical.
3.3
What type of energy transfer involves forces acting on the object?
Mechanical.
3.4
What type of energy transfer involves movement of energy from a hotter object to a cooler object?
Heating.
3.5
What type of energy transfer involves waves (e.g. sound or light)?
Radiation.
3.6
Draw an energy transfer diagram for battery-powered toy train.
electrical transfer
chemical store
kinetic store
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Knowledge Base: Science 7.4 Energy Year 7