Motion Worksheet-15
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Is displacement a scalar quantity?
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State whether distance is a scalar or a vector quantity.
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Change the speed of 6 m/s into km/h.
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What name is given to the speed in a specified direction?
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Give two examples of bodies having non-uniform motion.
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Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.
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What do the following measure in a car?
(a) Speedometer (b) Odometer
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Name the physical quantity which gives us an idea of how slow or fast a body is moving.
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Under what conditions can a body travel a certain distance and yet its resultant displacement be zero?
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In addition to speed, what else should we know to predict the position of a moving body?
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When is a body said to have uniform velocity?
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Under which condition is the magnitude of average velocity equal to average speed?
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Which of the two can be zero under certain conditions: average speed of a moving body or average velocity of a moving body?
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Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
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What is the acceleration of a body moving with uniform velocity?
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What is the other name of negative acceleration?
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Name the physical quantity whose SI unit is :
(a) m/s (b) m/s2
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What type of motion is exhibited by a freely falling body?
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What is the SI unit of retardation?
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Displacement is a …………… quantity whereas distance is a ………….quantity.
Answer:
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Displacement is a vector quantity and its units are meter, kilometer etc
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Distance is a scalar quantity and its units are meter, kilometer etc
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21.6 km/h
6 × 60 × 60/1000
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Velocity
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Walking from home to office.
A ball dropped from roof of a tall building travels unequal distances in equal intervals of time.
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Speed
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A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a land vehicle
An odometer is an instrument that indicates distance traveled by a vehicle, such as a bicycle or automobile
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speed
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When the body comes back to its starting point. For an example a body is completing one round of a circular track.
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Direction of speed
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A body has a uniform velocity if it travels in a specified direction in a straight line and covers equal distances in equal intervals of time.
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When the body moves along a straight line path.
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Average velocity. If displacement of a body is zero then its average velocity will be zero.
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Movement around a circular track. In this case the displacement after one complete round is zero hence velocity will be zero.
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Zero (0)
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Retardation (or Deceleration)
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(a) Speed (or Velocity) (b) Acceleration
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Non uniform motion
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m/s2
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Vector; scalar