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4 Cards in this Set
- Front
- Back
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What is a scalar quantity and what is a vector quantity |
A scalar quantity is a quantity (like mass) that does not have direction. A vector quantity (like acceleration or momentum) does have direction |
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Distance /time graphs |
On a distance/time graph: -horizontal lines mean object is not moving -straight, sloping lines mean the object is travelling at constant speed -the steeper the line, the faster the object is travelling - the speed is calculated from the gradient of the line |
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Equation for acceleratiom |
Change in velocity (m/s) / time taken (s) = acceleration (m/s2) A=v-u / t To relate velocity to acceleration: V2 - U2 = 2 x a x d |
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Velocity/time graphs |
On a velocity/time graph -a horizontal line means the object is travelling at constant velocity - a sloping line shows that the object is accelerating. The steeper the line, the greater the acceleration. If the line slopes down to the right, the object is decelerating. You can find the acceleration of an object from the the gradient of the line in a velocity time graph (length of verticale axis/ length of horizontal axis) -a negative velocity (a line below the horizontal axis) shows the object moving in the opposite direction Do calculate distance travelled, find the area under the line |
