Physics

3. This is the proportion of useful energy output compared to total energy input.
4. This is the product of an object's mass and velocity.
6. heat capacity This is the energy needed to raise the temperature of 1 kg of a substance by 1°C.
8. force This is the single force that has the same effect as all the forces acting on an object.
11. This is the rate of flow of electric charge in a circuit.
13. This is an atom with the same number of protons but a different number of neutrons.
14. This is the process by which radiation removes electrons from atoms.

1. This opposes the flow of current through a component.
2. This is the number of waves passing a point each second.
5. This is the mass per unit volume of a substance.
7. This states that energy cannot be created or destroyed, only transferred or stored.
9. This is the bending of a wave as it changes speed when entering a new medium.
10. left-hand rule This predicts the direction of force on a current-carrying conductor in a magnetic field.
12. This is a coil of wire that produces a strong magnetic field when current flows.