Class 9 Science: Force & Motion - Set 3

Question 1

The SI unit of momentum is

Accepted Answer

kg $m/s$

Answer

kg $m/s^2$

Answer

g $m/s$

Answer

g $m/s^2$

Question 2

The natural tendency of objects to resist a charge in their state of rest or uniform motion is called ________.

Accepted Answer

Inertia

Answer

force

Answer

momentum

Answer

Energy

Question 3

The resultant force of balanced force is _________

Accepted Answer

0 N

Answer

10 N

Answer

15 N

Answer

none of the above

Question 4

The value of inertia depends on the _______ of an object.

Accepted Answer

mass

Answer

length

Answer

force

Answer

Momentum

Question 5

The rate of change of momentum with respect to time is measured in

Accepted Answer

kg $m/s^2$

Answer

kg $m/s$

Answer

kg m

Answer

kg

Question 6

When an unbalanced force acts on a body, the body

Accepted Answer

must experience acceleration

Answer

must move with uniform velocity

Answer

must remain at rest

Answer

must move in the assumed path

Question 7

A man throws a ball of 200g vertically upwards with a speed of 10 $m/s$. Its momentum at the highest point of its flight will be

Accepted Answer

0

Answer

2 kg $m/s$

Answer

2000 kg $m/s$

Answer

1500 kg $m/s$

Question 8

Find the time taken by a body of mass 16kg to come to rest form of the uniform velocity of magnitude 10 $m/s$, when a force of 4N is applied continuously

Accepted Answer

40 Sec

Answer

20 Sec

Answer

30 Sec

Answer

50 Sec

Question 9

If the force acting on the body is Zero its momentum is

Accepted Answer

Content

Answer

Zero

Answer

Infinite

Answer

None of the above

Question 10

What force can change the velocity of a body of mass. 1kg from 20 $m/s$ to 30 $m/s$ in 2 second?

Accepted Answer

5 N

Answer

10 N

Answer

15 N

Answer

25 N

CHAPTER-9 FORCE AND LAW OF MOTION (SET-3)

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