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#### Laws of Motion Book Back Questions

11th Standard

Reg.No. :
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Physics

Time : 00:45:00 Hrs
Total Marks : 30
5 x 1 = 5
1. When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to

(a)

inertia of direction

(b)

inertia of motion

(c)

inertia of rest

(d)

absence of inertia

2. A book is at rest on the table which exerts a normal force on the book. If this force is considered as reaction force, what is the action force according to Newton's third law?

(a)

Gravitational force exerted by Earth on the book

(b)

Gravitational force exerted by the book on Earth

(c)

Normal force exerted by the book on the table

(d)

None of the above

3. Force acting on the particle moving with constant speed is

(a)

always zero

(b)

need not be zero

(c)

always non zero

(d)

cannot be concluded

4. When an object is at rest on "the inclined rough surface

(a)

static and kinetic frictions acting on the object is zero

(b)

static friction is zero but kinetic friction is not zero

(c)

static friction is not zero and kinetic friction is zero

(d)

static and kinetic frictions are not zero

5. If a person moving from pole to equator, the centrifugal force acting on him

(a)

increases

(b)

decreases

(c)

remains the same

(d)

increases and then decreases

6. 3 x 2 = 6
7. Why it is not possible to push a car from inside?

8. There is a limit beyond which the polishing of a surface increases frictional resistance rather than decreasing it why?

9. Can a single isolated force exist in nature? Explain your answer

10. 3 x 3 = 9
11. Explain the concept of inertia. Write two examples each for inertia of motion, inertia of rest and inertia of direction

12. State Newton's second law.

13. Define one newton

14. 2 x 5 = 10
15. Prove the law of conservation of linear momentum. Use it to find the recoil velocity of a gun when a bullet is fired from it.

16. What are concurrent forces? State Lami's theorem.