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20 Cards in this Set
- Front
- Back
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Rest
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Rest :A body is said to be in rest of it does not change its position with respect to its surroundings.
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Motion
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A body is said to be in motion if it changes its position with respect to its surroundings
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Distance
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It is the length of actual path traversed by the body between the initial and final positions
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Displacement
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It is the shortest distance moved by a body from the initial and final positions
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Uniform motion/speed
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If an object covers equal distances in equal intervals of time however small the tine intervals may be, then the motion is uniform motion/speed
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Non-uniform motion/speed
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If an object covers unequal distance in equal intervals of time, then it is said to be in Non-uniform motion/speed
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Speed
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s=v/t
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Average Speed
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Average speed =total distance/total time
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Velocity
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Velocity =displacement /time
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Scalar quantities
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The physical quantities which need only magnitude for their complete description, are called Scalar quantities.
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Vector quantities
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The physical quantities which need both magnitude and direction for their complete description,are called Vector quantities.
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Average velocity
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average velocity= net displacement / total time
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Acceleration
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a= v-u / t
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Retardation
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Negative acceleration
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Uniform acceleration
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If an object travels in a straight line and its velocity changes by equal amounts in equal intervals of time, the object is said to be in Uniform acceleration.
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Non-uniform acceleration
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If the velocity of an object changes by unequal amounts in equal intervals of time, the object is said to be in Non-uniform acceleration.
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3 Equations of motion
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1st: v = u+at
2nd: s= ut+½ at² 3rd: 2as= v² - u² |
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Distance-Time graph
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It is the graph between the time(t) and distance(s) of a particle relative to a fixed origin. Its slope at any point gives the instantaneous velocity at that point.
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Velocity-time graph
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Or is the time versus velocity. Its slope at any point gives the acceleration at the corresponding instant. Distance covered in time(t) equals area under the graph.
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Uniform circular motion
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When a body moves along a circular path with uniform speed, its motion is called Uniform circular motion. The motion is accelerated due to the change in direction and not due to the change in magnitude of velocity.
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