Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 8

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IMPORTANT

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Which would require a greater force accelerating a $2 k g$ mass at $5 m s^{- 2}$ or a $4 k g$ mass at $2 m s^{- 2}$ ?

Important Questions on Force and Laws of Motion

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9th CBSE

IMPORTANT

Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 9

A force of

5 N

gives a mass

m_{1}

, an acceleration of

10 m s^{- 2}

and a mass

m_{2}

, an acceleration of

20 m s^{- 2}

. What acceleration would it give if both the masses were tied together?

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9th CBSE

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Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 10

A

150 g

ball travelling at

30 m s^{- 1}

strikes the palm of a player’s hand and is stopped in

0.06 s

. Calculate the force exerted by the ball on the hand.

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IMPORTANT

Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 11

A body of mass

1 k g

is kept at rest. A constant force of

6 N

starts acting on it. Find the time taken by the body to move through a distance of

12 m

.

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IMPORTANT

Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 12

A body of mass

5 k g

is moving with a velocity of

10 m s^{- 1}

. A force is applied to it so that in

25 s

, it attains a velocity of

35

m s^{- 1}

. Calculate the value of the force applied.

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Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 13

An unloaded truck weighing

2000 k g

has a maximum acceleration of

0.5 m s^{- 2}

. What is the maximum acceleration when it is carrying a load of

2000 k g

?

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Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 14

The speed-time graph of a ball of mass

20 g

moving along a straight line on a long table is given in. How much force does the table exert on the ball to bring it to rest?
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Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 15

A constant force acts on an object of mass

5 k g

for a duration of

2 s

. It increases the object’s velocity from

3 m s^{- 1}

to

7 m s^{- 1}

. Find the magnitude of the applied force. Now if the force were applied for a duration of

5 s

, what would be the final velocity of the object?

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9th CBSE

IMPORTANT

Physics For Class 9>Chapter 2 - Force and Laws of Motion>Exercise>Q 16

A bullet of mass

50 g

is fired from a gun of mass

6 k g

with a velocity of

400 m s^{- 1}

. Calculate the recoil velocity of the gun.