(a) Differentiate between speed and velocity. (b) When is a body said to have uniform velocity ? (c)

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7. MOTION

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$(a)$ Differentiate between speed and velocity.

$(b)$ When is a body said to have uniform velocity ?

$(c)$ How can we describe the position of an object ? Illustrate with suitable example.

Option A

Option B

Option C

Option D

Solution

$(a)$ Speed is distance travelled per unit time while velocity is displacement per unit time. Speed is always positive while velocity can be zero, negative or positive.

$(b)$ Velocity is said to be uniform, if a body covers equal displacements in equal intervals of time.

$(c)$ The position of an object can be described with respect to an origin or some reference point. Flight of a bird with respect to the earth.

Standard 9

Science

State which of the following situations are possible and give an example of each of these

$(a)$ A body moving with constant acceleration but with zero velocity.

$(b)$ A body moving horizontally with an acceleration in vertical direction.

$(c)$ A body moving with a constant velocity in an accelerated motion.

medium

A body moves with a velocity of $2\, m s ^{-1}$ for $5\, s$, then its velocity increases uniformly to $10\, m s ^{-1}$ in next $5\, s.$ Thereafter, its velocity begins to decrease at a uniform rate until it comes to rest after $5\, s$.

$(i)$ Plot a velocity-time graph for the motion of the body.

$(ii)$ From the graph, find the total distance covered by the body after $2\, s$ and $12\, s$.

medium

The displacement $-$ time graph of a body is parallel to time axis. What will you infer about the velocity of the body ?

easy

The following displacement $-$ time graph shows the positions of a body at different times, Calculate the velocity of the body as it moves from : $(i) A-B \,(i i) B-C$ $(iii)$ $C-D$.

medium

Name the physical quantity which corresponds to the rate of change of momentum.

easy

$(a)$ Differentiate between speed and velocity. $(b)$ When is a body said to have uniform velocity ? $(c)$ How can we describe the position of an object ? Illustrate with suitable example.

Solution

Similar Questions

The displacement $-$ time graph of a body is parallel to time axis. What will you infer about the velocity of the body ?

The following displacement $-$ time graph shows the positions of a body at different times, Calculate the velocity of the body as it moves from : $(i) A-B \,(i i) B-C$ $(iii)$ $C-D$.

Name the physical quantity which corresponds to the rate of change of momentum.

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$(a)$ Differentiate between speed and velocity.

$(b)$ When is a body said to have uniform velocity ?

$(c)$ How can we describe the position of an object ? Illustrate with suitable example.