Energy and Work Done Flashcards
What is the symbol, SI unit and SI unit symbol for work done?
w, joule, J
What are the 2 conditions required for work to be done?
- A force acts on an object.
- The object moves in the same direction as the force.
If a girl picks up a marble, is work done?
Yes work is done on the marble. A force acts on the girl on the marble when she picks it up. The marble moved in the same direction as the force.
What is the formula for work done?
Work done = Force × Distance
What type of energy is in a torch?
Light energy.
What type of energy is in a flame?
Thermal energy.
What type of energy is in a current flowing in a circuit?
Electrical energy.
What type of energy is in someone’s voice?
Sound energy.
What type of energy is in a moving bicycle?
Kinetic energy.
What type of energy is in a stretched rubber band?
Elastic potential energy.
What type of energy is in a bicycle on top of a hill?
Gravitational potential energy.
What type of energy is in food and batteries?
Chemical potential energy.
State the definition of energy.
Energy cannot be created nor destroyed. It can only be converted from one form to another or transferred from one body to another such that the total amount of energy remains constant.
At which point of a diagram would be the highest kinetic energy?
The lowest point.
At which point of a diagram would be the highest gravitational potential energy?
The highest point.
