 |  Work, Energy and Power 30 Flashcards |  Start |
 | What is the scientific definition of work? |  Card: 1 / 30 |
| Work is done when a force acts on an object and causes displacement. | Card: 2 / 30 |
| True or False: No work is done if an object does not move. | Card: 3 / 30 |
| True. Work requires displacement in the direction of the force. | Card: 4 / 30 |
| Fill in the blank: The SI unit of work is _____ | Card: 5 / 30 |
| Joule (J) | Card: 6 / 30 |
| What is the formula for work done by a constant force? | Card: 7 / 30 |
| W = F d cosθ | Card: 8 / 30 |
| What happens when the angle θ is 90° in the work formula? | Card: 9 / 30 |
| The work done is zero because cos 90° equals zero. | Card: 10 / 30 |
| What is the difference between positive and negative work? | Card: 11 / 30 |
| Positive work occurs when force and displacement are in the same direction; negative work occurs when they are opposite. | Card: 12 / 30 |
| Calculate the work done if a force of 50 N moves an object 4 m. | Card: 13 / 30 |
| W = 50 N × 4 m = 200 J | Card: 14 / 30 |
| Multiple Choice: Which force is a conservative force? | Card: 15 / 30 |
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| B) Gravity | Card: 16 / 30 |
| Why does work done by friction depend on the path taken? | Card: 17 / 30 |
| Friction is a non-conservative force, causing energy loss based on distance. | Card: 18 / 30 |
| What is the relationship between work done and potential energy in a conservative force? | Card: 19 / 30 |
| Work done against conservative forces equals the change in potential energy. | Card: 20 / 30 |
| Scenario: A box is pushed 10 m with a force of 100 N. If friction does 50 J of work, what is the net work done? | Card: 21 / 30 |
| Net work = (100 N × 10 m) - 50 J = 1000 J - 50 J = 950 J. | Card: 22 / 30 |
| What defines a conservative force? | Card: 23 / 30 |
| A conservative force has work that is path-independent and depends only on initial and final positions. | Card: 24 / 30 |
| What is potential energy when an object is lifted to height h? | Card: 25 / 30 |
| Potential energy = mgh, where m is mass and g is gravitational acceleration. | Card: 26 / 30 |
| How is power defined in relation to work? | Card: 27 / 30 |
| Power is the rate at which work is done, calculated as Power = Work / Time. | Card: 28 / 30 |
| What is the work-energy theorem? | Card: 29 / 30 |
| The work done by the net force on an object equals the change in its kinetic energy. | Card: 30 / 30 |
| Completed! Keep practicing to master all of them. |  Restart |
