Motion Under Gravity Notes

Question 1

What is the value of acceleration due to gravity (g) on the surface of the Earth?

Accepted Answer

9.8 m/s²

Answer

9.8 cm/s²

Answer

980 m/s²

Answer

9.8 km/s²

Question 2

When a body is thrown vertically upwards, what is its velocity at the highest point?

Accepted Answer

Zero

Answer

Maximum

Answer

9.8 m/s

Answer

Equal to initial velocity

Question 3

When a body is thrown vertically upwards, its acceleration at the highest point is:

Accepted Answer

9.8 m/s² downwards

Answer

Zero

Answer

9.8 m/s² upwards

Answer

Variable

Question 4

A heavier object and a lighter object are dropped from the same height in a vacuum. Which will reach the ground first?

Accepted Answer

Both will reach simultaneously

Answer

The heavier object

Answer

The lighter object

Answer

Depends on their shape

Question 5

The time of ascent of a vertically projected body is ________ the time of descent (ignoring air resistance).

Accepted Answer

Equal to

Answer

Greater than

Answer

Less than

Answer

Unrelated to

Question 6

What is the formula to calculate the maximum height (H) reached by a body thrown vertically upwards with initial velocity 'u'?

Accepted Answer

u²/2g

Answer

u/g

Answer

2u/g

Answer

u/2g

Question 7

What is the formula for the total time of flight for a body thrown vertically upwards and returning to the same point?

Accepted Answer

2u/g

Answer

u/g

Answer

u²/2g

Answer

u/2g

Question 8

If air resistance is taken into account, the time of descent will be ________ the time of ascent.

Accepted Answer

Greater than

Answer

Less than

Answer

Equal to

Answer

Half of

Question 9

A ball is dropped from a height. Its initial velocity (u) is:

Accepted Answer

Zero

Answer

9.8 m/s

Answer

-9.8 m/s

Answer

Depends on mass

Question 10

Which equation of motion is used to find the velocity of a freely falling body after time 't'?

Accepted Answer

v = u + at

Answer

s = ut + 1/2 at²

Answer

v² = u² + 2as

Answer

v = s/t

Question 11

The value of 'g' at the center of the Earth is:

Accepted Answer

Zero

Answer

9.8 m/s²

Answer

Infinity

Answer

4.9 m/s²

Question 12

The value of 'g' ________ as we move from the equator to the poles.

Accepted Answer

Increases

Answer

Decreases

Answer

Remains constant

Answer

Becomes zero

Question 13

The value of 'g' ________ as we go higher above the Earth's surface.

Accepted Answer

Decreases

Answer

Increases

Answer

Remains constant

Answer

Fluctuates

Question 14

What happens to the weight of a body in a freely falling elevator?

Accepted Answer

It becomes zero

Answer

It doubles

Answer

It remains same

Answer

It halves

Question 15

Mass of a body is 10 kg. What is its weight on Earth? (Take g = 9.8 m/s²)

Accepted Answer

98 N

Answer

10 N

Answer

9.8 N

Answer

0.98 N

Question 16

The acceleration due to gravity on the Moon is approximately ________ that of the Earth.

Accepted Answer

1/6

Answer

1/2

Answer

1/4

Answer

1/10

Question 17

If a person weighs 600 N on Earth, what will be their mass on the Moon? (Take g=10 m/s² on Earth)

Accepted Answer

60 kg

Answer

10 kg

Answer

100 kg

Answer

3600 kg

Question 18

The path of a projectile thrown horizontally from a height under the influence of gravity is a:

Accepted Answer

Parabola

Answer

Circle

Answer

Straight line

Answer

Hyperbola

Question 19

The escape velocity from the surface of the Earth is approximately:

Accepted Answer

11.2 km/s

Answer

9.8 km/s

Answer

11.2 m/s

Answer

3 * 10^8 m/s

Question 20

A body is thrown vertically upwards with a velocity of 19.6 m/s. How long will it take to reach the highest point?

Accepted Answer

2 s

Answer

1 s

Answer

4 s

Answer

9.8 s

Motion Under Gravity Notes

What is the value of acceleration due to gravity (g) on the surface of the Earth?

When a body is thrown vertically upwards, what is its velocity at the highest point?

When a body is thrown vertically upwards, its acceleration at the highest point is:

A heavier object and a lighter object are dropped from the same height in a vacuum. Which will reach the ground first?

The time of ascent of a vertically projected body is ________ the time of descent (ignoring air resistance).

What is the formula to calculate the maximum height (H) reached by a body thrown vertically upwards with initial velocity 'u'?

What is the formula for the total time of flight for a body thrown vertically upwards and returning to the same point?

If air resistance is taken into account, the time of descent will be ________ the time of ascent.

A ball is dropped from a height. Its initial velocity (u) is:

Which equation of motion is used to find the velocity of a freely falling body after time 't'?

The value of 'g' at the center of the Earth is:

The value of 'g' ________ as we move from the equator to the poles.

The value of 'g' ________ as we go higher above the Earth's surface.

What happens to the weight of a body in a freely falling elevator?

Mass of a body is 10 kg. What is its weight on Earth? (Take g = 9.8 m/s²)

The acceleration due to gravity on the Moon is approximately ________ that of the Earth.

If a person weighs 600 N on Earth, what will be their mass on the Moon? (Take g=10 m/s² on Earth)

The path of a projectile thrown horizontally from a height under the influence of gravity is a:

The escape velocity from the surface of the Earth is approximately:

A body is thrown vertically upwards with a velocity of 19.6 m/s. How long will it take to reach the highest point?

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