Free Printable Laws of Motion

1.

1. A jet engine works on the principle of______________.

a)

conservation of linear momentum

b)

conservation of mass

c)

conservation of Energy

d)

conservation of angular momentum

2.

2. A large force acts for a short time'dt'.The impulse imparted is equal to change in___________.

a)

mass

b)

velocity

c)

momentum

d)

acceleration

3.

3. A lift is moving from the ground floor to the third floor in a multistoried building. What will happen to the weight of a person in lift, when it starts to move up

a)

W = m(g+a)

b)

W = m(g-a)

c)

W = mg

d)

W = 0

4.

4. A shell of mass 0.01kg is fired by a gun of mass 10kg. What is the recoil speed,if the muzzle speed of shell is 90m/s

a)

0.09 m/s

b)

0.9 m/s

c)

90 m/s

d)

10 m/s

5.

5. Which of the following is known as" law of inertia ".

a)

Newton's third law of motion

b)

Newton's second law of motion

c)

Newton's first law of motion

d)

Law of conservation of momentum

6.

6. Action and reaction don't cancel each other because they:-

a)

act in two different directions

b)

act on two different bodies

c)

are not equal in magnitude

d)

are in same direction

7.

7. A motorcycle and a bus are moving with same momentum. Which has greater KE

a)

Bus

b)

both have same KE

c)

Motorcycle

d)

none of the above

8.

8. It is easier to roll a body than to slide it because:-

a)

kinetic friction > static friction

b)

sliding friction < rolling friction

c)

rolling friction < sliding friction

d)

kinetic friction < rolling friction

9.

9. Max. permissible speed on a banked road is :-

a)

$\sqrt{\mu rg}$ = v

b)

v = $\sqrt{rg\tan\theta}$

c)

v = $\sqrt{\frac{rg\left(\tan\theta+\mu\right)}{1-\mu\tan\theta}}$

d)

v = $\sqrt{\frac{rg\left(\mu-\tan\theta\right)}{1+\mu\tan\theta}}$

10.

10. __________ is the maximum value of static friction

a)

kinetic friction

b)

rolling friction

c)

sliding friction

d)

limiting friction

11.

11. Momentum is a __________ quantity.

a)

dimensionless

b)

unitless

c)

vector

d)

scalar

12.

12. $F\ \propto\frac{\Delta p}{\Delta t}$ represents which law

a)

Newton's first law

b)

Newton's second law

c)

Newton's third law

d)

Newton's law of gravitation

13.

13. Which of the following is the unit of Force:-

a)

Kg.m/s

b)

Kg.m/s²

c)

N.s^-1

d)

J.s^-1

14.

14. For a body of mass 50 Kg inside a lift, when it is freely falling downward, the apparent weight is found to be:-

a)

$500\ N$

b)

$>500\ N$

c)

$<500\ N$

d)

$Zero$

15.

15. What is the constant force acting on a body of mass

2 Kg, changing its speed from 2.0 m/s to 3.5 m/s in 10s.

a)

3 N

b)

0.03 N

c)

0.3 N

d)

30 N

16.

16. Banking of roads is done:-

a)

to avoid skidding of vehicles on a circular road

b)

to reduce wear and tear of tyres

c)

to avoid accidents on a turning

d)

All the above

17.

17. Friction is termed as" a necessary evil ", because

a)

it has only advantages

b)

it has only disadvantages

c)

it is not applicable in daily life

d)

it has both advantages and disadvantages

18.

18. A standing passenger falls back when the bus starts suddenly, due to ________________

a)

inertia of rest

b)

inertia of motion

c)

inertia of direction

d)

none of the above

19.

19. When a car moves in a circular road , which force provides the centripetal force

a)

gravitational force

b)

frictional force

c)

Normal reaction

d)

wind force

20.

20. In this graph the (I)portion OA, (II) point A, (iii) portion BC represents respectively

a)

kinetic,static and limiting friction

b)

limiting, kinetic and static friction

c)

static,limiting,and kinetic friction

d)

static,sliding and rolling friction

Laws of Motion

Total questions: 20

Worksheet time: 11mins

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