Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 4

MEDIUM

9th CBSE

IMPORTANT

Earn 100

How will the equations of motion for an object moving with a uniform velocity change?

Important Questions on Motion

MEDIUM

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 1

Establish the formula

v = u + at

and

s = ut + \frac{1}{2} {at}^{2}

where symbols have usual meaning.

HARD

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 2

Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between

4 th and 5 th

seconds.

HARD

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>EXERCISE>Q 3

Two stones are thrown vertically upwards simultaneously with their initial velocities

{u_{1}}_{}

and

u_{2}

respectively. Prove that the heights reached by them would be in the ratio of

u_{1}^{2} : u_{2}^{2}

. (Assume upward acceleration is

- g

and downward acceleration to be

+ g

).

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9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>Practice Problems>Q 1

Distance $(m)$	0	4	8	12	16
Time $(s)$	0	1	2	3	4

From the given table, plot the distance-time graph.

From the graph, calculate : $(i)$ the average speed, $(ii)$ the distance between $1.5 s$ and $3.5 s$ .

EASY

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>Practice Problems>Q 2

Distance $(m)$	$3$	$6$	$9$	$12$	$12$	$12$	$6$	$0$
Time $(s)$	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$7$

From the given table, plot the distance-time graph. From the graph calculate:

(i) The average speed between $0 - 3 s$ .

(ii) The average speed between $3 s - 5 s$ .

(iii) The average speed between $5 s - 7 s$ .

MEDIUM

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>Practice Problems>Q 1

Velocity $(m / s)$	20	20	10	20	0
Time $(s)$	0	5	7	10	15

The above table shows the velocity of the motorbike at various intervals of time. Plot a velocity-time graph.

Calculate deceleration between $5 s$ and $7 s$ .

MEDIUM

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>Practice Problems>Q 1

Velocity $(m / s)$	20	20	10	20	0
Time $(s)$	0	5	7	10	15

The above table shows the velocity of the motorbike at various intervals of time. Plot a velocity-time graph.

Calculate acceleration between $7 s and 10 s .$

MEDIUM

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 1 - Motion>Practice Problems>Q 1

Velocity $(m / s)$	20	20	10	20	0
Time $(s)$	0	5	7	10	15

The above table shows the velocity of the motorbike at various intervals of time. Plot a velocity-time graph.

Calculate deceleration between $10 s ans 15 s$ .