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Flashcards by nikeishabk, updated more than 1 year ago
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Created by nikeishabk
almost 6 years ago
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831
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Description
Resource summary
| Question | Answer |
| Scalar | A quantity that has Magnitude only without direction Examples: Length, area, volume, distance, speed, mass, density, pressure, temperature, energy, work, power, electrical potential, charge, time. |
| Vector | A quantity that has (both) magnitude / size and direction Examples: Displacement, velocity, acceleration, momentum, force (lift, drag, thrust, weight), field(s), a.c. voltage, current (when calculating fields only). |
| Displacement | (Net) distance moved in a particular direction. |
| Instantaneous speed | Speed measured between two point a very small time apart. |
| Average speed | Distance covered / time taken. |
| Velocity | Speed in a given direction - the rate of change of distance. |
| Acceleration | The rate of change of velocity/The gradient of a velocity vs time graph. (= change in velocity / time taken). |
| The Newton | The (net) force which gives a mass of 1kg an acceleration of 1 ms-2. |
| Torque of a Couple | One of forces × perpendicular distance (between forces) (Not force x perpendicular distance). |
| Moment of a force | Moment = force x perpendicular distance from pivot / axis / point. |
| Thinking Distance | The distance travelled (by the car) from when the driver sees a problem and the brakes are applied. |
| Braking Distance | The distance travelled (by the car) whilst the brakes are applied and the car stops (wtte). |
| Stopping Distance | Stopping distance: Thinking distance + braking distance. |
| Work done by a Force | Work done = force x distance moved / travelled in the direction of the force. |
| Joule | Energy required to move a weight of 1N (through) a distance of 1 m. |
| Power - rate of work done | Power = work (done)/time or power = energy/time or power = rate of work done. |
| Watt | Power required to move 1N through a distance of 1m in 1 sec (Rate of doing work). |
| Stress | Force/(cross-sectional) area. |
| Strain | Extension/original length. |
| Young's Modulus | Stress/strain. Young modulus is equal to the gradient from stress-strain graph (in the linear region). |
| Ultimate Tensile Strength (UTS) | Ultimate tensile strength = Maximum stress material can withstand (before fracture). |
| Elastic Deformation | Extension (or compression) force (as long as elastic limit is not exceeded). |
| Plastic Deformation | Material does not return to original length / shape/ size (is permanently deformed / longer) when the force / stress is removed. |
| Density | Mass/volume or mass per (unit) volume. |