level: End of chapter questions
Questions and Answers List
level questions: End of chapter questions
| Question | Answer |
|---|---|
| Explain this equation using words W = Fs cosθ | The work done W when a force F moves through a displacement s in the direction of the force, where θ is the angle between the force and the displacement |
| Define joule | A joule is defines as the work done (or energy transferred ) when a force of 1 N moves a distance of 1 m in the direction of the force. |
| Explain the equation using words E`p = mgh | When an object of mass m rises through a height h, its gravitational potential energy E`p increases by an amount |
| Explain the equation using words E`k = 1/2 mv^2 | The kinetic energy E`k of a body of mass m moving at speed v |
| What does the principle of conservation of energy state for a closed system | For a closed system energy can be transferred to other forms but the total amount of energy remain constant. |
| What is the equation for determining efficiency? | (useful output energy ➗ Total input energy ) ✖️100 |
| Explain following equations in words P=W/t P = Fv | Power is the rate at which work is done(or energy is transferred ) |
| Define watt | Rate of transfer of energy of 1 joule per second |