10 Questions
What is the energy transferred from the Sun to the Earth's surface mainly in the form of?
Infrared radiation
What is the force that opposes motion between two surfaces in contact, proportional to?
The normal force between the surfaces
What is the process by which an object's kinetic energy is transferred to the surroundings as heat energy?
Dissipation
What is the ratio of the output force to the input force in a machine?
Mechanical advantage
What is the unit of measurement for the amount of electric charge?
Coulomb
What is the main function of the Earth's atmosphere in the context of energy transfer?
To absorb and distribute heat energy around the globe
What is the term used to describe the motion of an object when the force applied is equal to the frictional force?
Dynamic equilibrium
What is the type of energy associated with an object's motion?
Kinetic energy
What is the purpose of a pulley system in a machine?
To change the direction of force
What is the unit of measurement for the amount of electrical resistance in a circuit?
Ohm
Study Notes
Energy and Forces
- Energy transferred from the Sun to the Earth's surface is mainly in the form of electromagnetic radiation (e.g., light and heat).
- Frictional force opposes motion between two surfaces in contact and is proportional to the normal force between the surfaces.
Energy Transfer
- The process where an object's kinetic energy is transferred to the surroundings as heat energy is called friction.
Machines
- The ratio of the output force to the input force in a machine is known as mechanical advantage.
Electricity
- The unit of measurement for the amount of electric charge is the coulomb (C).
Test your knowledge of physics from the UK national curriculum for year 8 and 9 students. Covering topics such as energy, forces, and machines.
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