 |  Work and Energy 48 Flashcards |  Start |
 | What is the SI unit of work? |  Card: 1 / 48 |
| Joule (J) | Card: 2 / 48 |
| A person holds a weight motionless above ground. Is work being done? | Card: 3 / 48 |
| B) No, because there's no displacement | Card: 4 / 48 |
| True or False: Work is done only when force causes displacement in its direction. | Card: 5 / 48 |
| True | Card: 6 / 48 |
| The formula for work done by a constant force is W = _____ × d × cos θ. | Card: 7 / 48 |
| F | Card: 8 / 48 |
| What happens to work done when force and displacement are perpendicular? | Card: 9 / 48 |
| Work done becomes zero because cos 90° = 0 | Card: 10 / 48 |
| A ball falls freely under gravity. What type of work is done? | Card: 11 / 48 |
| C) Positive work | Card: 12 / 48 |
| Which component of force does no work on a moving object? | Card: 13 / 48 |
| The component perpendicular to displacement | Card: 14 / 48 |
| Convert 1 joule to ergs. | Card: 15 / 48 |
| 1 joule = 10⁷ ergs | Card: 16 / 48 |
| True or False: Friction always does negative work on a moving object. | Card: 17 / 48 |
| False. Friction can do positive work, like helping a car accelerate forward. | Card: 18 / 48 |
| What is the dimensional formula for work? | Card: 19 / 48 |
| [ML²T⁻²] | Card: 20 / 48 |
| A force acts at 60° to displacement. If F = 10 N and d = 5 m, find work done. | Card: 21 / 48 |
| W = 10 × 5 × cos 60° = 25 J | Card: 22 / 48 |
| Which forces are examples of conservative forces? | Card: 23 / 48 |
| B) Gravity and spring force | Card: 24 / 48 |
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| A conservative force does _____ work in a complete round trip. | Card: 25 / 48 |
| Zero | Card: 26 / 48 |
| Why is gravitational force called conservative? | Card: 27 / 48 |
| Work done depends only on initial and final positions, not path taken | Card: 28 / 48 |
| True or False: Frictional force is a non-conservative force. | Card: 29 / 48 |
| True | Card: 30 / 48 |
| For variable force F(x), work is calculated using W = ∫ _____ dx. | Card: 31 / 48 |
| F(x) | Card: 32 / 48 |
| What does the area under a Force-displacement graph represent? | Card: 33 / 48 |
| Work done by the force | Card: 34 / 48 |
| A spring with force F = 5x N is compressed by 2 m. Calculate work done. | Card: 35 / 48 |
| W = ∫₀² 5x dx = 5x²/2 |₀² = 10 J | Card: 36 / 48 |
| State the work-energy theorem in simple terms. | Card: 37 / 48 |
| Work done by net force equals change in kinetic energy | Card: 38 / 48 |
| True or False: When only conservative forces act, mechanical energy is conserved. | Card: 39 / 48 |
| True | Card: 40 / 48 |
| A 2 kg block moves with velocity changing from 3 m/s to 5 m/s. Find work done. | Card: 41 / 48 |
| W = ΔKE = ½m(v₂² - v₁²) = ½(2)(25-9) = 16 J | Card: 42 / 48 |
| What happens when work is done against friction? | Card: 43 / 48 |
| Mechanical energy decreases and converts to heat energy | Card: 44 / 48 |
| A pendulum swings from lowest to highest point. What energy conversion occurs? | Card: 45 / 48 |
| Kinetic energy converts to gravitational potential energy | Card: 46 / 48 |
| For minimum speed to complete vertical circular motion, v = √_____. | Card: 47 / 48 |
| 5gR | Card: 48 / 48 |
| Completed! Keep practicing to master all of them. |  Restart |
