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Description
Flashcards by alicia skinner, updated more than 1 year ago
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Created by alicia skinner
about 9 years ago
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| Question | Answer |
| Science - physics Force Arrows | |
| Balanced and unbalanced forces | |
| Mass | In physics, mass is a property of a physical body. It is generally a measure of an object's resistance to change its state of motion when a force is applied. |
| Weight | The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton. Density is mass/volume. |
| Hooks law | The deforming force may be applied to a solid by stretching, compressing, squeezing, bending, or twisting. Thus, a metal wire exhibits elastic behaviour according to Hooke’s law because the small increase in its length when stretched by an applied force doubles each time the force is doubled. Mathematically, Hooke’s law states that the applied force F equals a constant k times the displacement or change in length x, or F = kx. The value of k depends not only on the kind of elastic material under consideration but also on its dimensions and shape. |
| Work Done | To a physicist, only parts of it are. Work is done when a force that is applied to an object moves that object. The work is calculated by multiplying the force by the amount of movement of an object (W = F * d). A force of 10 newtons, that moves an object 3 meters, does 30 n-m of work. |
| Force multiples | |
| Speed | Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is direction-aware. |
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