work,energy and power Flashcards
What is the formula for calculating work?
Work = Distance moved x Horizontal force
Work is measured in Joules.
How is work represented visually?
Work may be represented by a diagram drawn to scale.
What is energy?
Energy is the capability to do work and exists in various forms.
Define chemical energy.
Chemical energy forms when energy is released or absorbed during chemical reactions.
What is fission in atomic energy?
Fission is the liberating or splitting of atoms, often produced from uranium in a nuclear reactor.
What is fusion in atomic energy?
Fusion is the combining of atoms, which is the process by which the sun gives out light and heat.
What causes heat energy?
Heat energy exists due to the motion of molecules in matter.
What are the three types of mechanical energy?
- Potential energy
- Kinetic energy
- Strain energy
Define potential energy.
Potential energy is possessed by a body by virtue of its position.
What is kinetic energy?
Kinetic energy is possessed by a body by virtue of its velocity.
What is strain energy?
Strain energy may be stored in a piece of strained elastic material.
What is the definition of power?
Power is the rate at which work is done.
What is the formula for power?
Power = Work done / Time taken
Also expressed as Power = Force x Velocity.
Fill in the blank: Work can be done slowly or quickly depending upon _______.
[power available]
How is power measured?
Power is measured in watts.
What is the relationship between work, time, and power?
Power (watts) = Work (NM) / Time (S) = Work (J) / Time (S).
