## Physics - Motion

Class-IX

Assignment Sheet

Q1(MCQs) : Choose the correct option from choices given.

A particle is moving in a circular path of radius’ r’. The displacement after half a circle would be
(a) Zero
(b) π × r
(c) 2r
(d) 2 × π × r

The numerical ratio of displacement and distance of a moving object is
(a) always greater than 1.
(b) always equal to 1.
(c) always more than 1.
(d) equal or less than 1.

ⅲ An object has moved through a finite distance
(a) its displacement must be equal to the distance moved by it.
(b) its displacement must be positive .
(c) its displacement is less than the distance moved by it.
(d) Displacement may be zero.

Speedometer fitted in an automobile measure its
(a) average speed
(b) acceleration
(c) instantaneous speed
(d) distance covered

ⅴ An object is said to have a variable velocity if
(a) its speed changes
(b) its direction of motion changes
(c) its speed as well as direction of motion changes.
(d) all of the above

Q2: Answer the following in brief.

(a) The distance time graph of a particle is a straight line parallel to the time axis, it means that the
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(b) What is the value of acceleration for a body at rest?

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(c) Odometer is an instrument fitted in an automobile measures

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(d) A student considered Earth as point object while considering its motion around the sun, Is he justified?

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(e) What is real meaning of negative acceleration?

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Q3:
ⅰ Draw the graphical representation of motion(on graph paper)
(a) Uniform speed
(b) Non uniform speed

ⅱ Draw the Speed-time graphs for the following:
a) When velocity remains constant
b) Uniform acceleration
c) When initial speed of a body is not zero.
d) Non uniform acceleration

Q4: A car is moving on a straight road with uniform acceleration. The following table gives the speed of the car at various instants of time:
```┌───────┬───┬───┬───┬───┬───┬───┬───┐
│ Speed │5  │10 │15 │20 │25 │30 │35 │
├───────┼───┼───┼───┼───┼───┼───┼───┤
│ Time  │0  │10 │20 │ 30│ 40│50 │60 │
└───────┴───┴───┴───┴───┴───┴───┴───┘

```
Draw the speed time graph by choosing a convenient scale. Determine for it:
(a) The acceleration of the car
(b) The distance travelled by the car in 60 seconds?

Q5: Write the differences between:
(a) Distance vs Displacement
(b) Speed vs Velocity

Q6: An object starting from rest covers 20 metres in first 2 seconds & 160 metres in next 4 seconds. What is its velocity after 7 seconds from the start?

Q7: A car moving at speed of 72km/h and applies brakes which provide a retardation of 5m/s².
How much time does the car take to stop?
How much distance does the car cover before coming to rest?
What would be the stopping distance needed if speed of the car is doubled?  #### Post a Comment

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