Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 6

EASY

9th Telangana Board

IMPORTANT

Earn 100

Explain why a long pole is more beneficial to the tight rope walker if the pole has slight bending.

Important Questions on Gravitation

MEDIUM

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 1

A car moves with constant speed of

10 m s^{- 1}

in a circular path of radius

10 m

. The mass of the car is

1000 kg

. How much is the required centripetal force for the car?

MEDIUM

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 2

What is the speed of an apple dropped from a tree after

1.5

second? What distance will it cover during this time? Take

g = 10 m s^{- 2}

.

MEDIUM

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 3

A ball is projected vertically up with a speed of

50 m s^{- 1}

. Find the maximum height, the time to reach the maximum height and the speed at the maximum height. (

g = 10 m s^{- 2}

)

EASY

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 4

Two spherical balls of mass

10 kg

each are placed with their centres

10 cm

apart. Find the gravitational force of attraction between them.

MEDIUM

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 5

Find the free-fall acceleration of an object on the surface of the moon, if the radius of the moon and its mass are

1740 km

and

7.4 \times 10^{22} kg

respectively. Compare this value with free-fall acceleration of a body on the surface of the earth.

MEDIUM

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 6

A ball is dropped from a height. If it takes

0.2 s

to cross the last

6 m

before hitting the ground, find the height from which it is dropped. Take

g = 10 m s^{- 2}

.

MEDIUM

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 7

The bob of a simple pendulum of length

1 m

has mass

100 g

and a speed of

1.4 m s^{- 1}

at the lowest point in its path. Find the tension in the string at this moment. Take

g = 9.8 m s^{- 2}

.

EASY

9th Telangana Board

IMPORTANT

Physical Science Class 9>Chapter 5 - Gravitation>Let us Improve our learning>Q 8

What path will the moon take when the gravitational interaction between the moon and the earth disappears?