#### Laws of Motion Important Questions

10th Standard EM

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
7 x 1 = 7
1. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg

(a)

4 M

(b)

2 M

(c)

M/4

(d)

M

2. If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

(a)

decrease by 50%

(b)

increase by 50%

(c)

decrease by 25%

(d)

increase by 300%

3. ______ deals with the bodies which are at rest under the action of forces.

(a)

Statics

(b)

Kinematics

(c)

Dynamics

(d)

Mechanics

4. The resistance of a body to change its direction of motion is

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

5. Mixing sugar in a glass of milk using a spoon is ______

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

6. The law that gives a qualitative definition of force is _______

(a)

Newton's I law

(b)

Newton's II law

(c)

Newton's III law

(d)

Law of gravitation

7. If two equal forces acting along opposite direction is parallel to each other then they are called as

(a)

resultant

(b)

equilibriant

(c)

like

(d)

unlike

8. 5 x 2 = 10
9. If a 5 N and a 15 N forces are acting opposite to one another. Find the resultant force and the direction of action of the resultant force

10. State the principle of moments.

11. What is Torque? Give examples moment of force.

12. How can you measure torque?

13. Define 1 N.

14. 3 x 4 = 12
15. The ratio of masses of two planets is 2:3 and the ratio of their radii is 4:7 Find the ratio of their accelerations due to gravity.

16. Derive the Relation between g and G?

17. Discuss the apparent weight of a man in lift?

18. 2 x 7 = 14
19. Give the applications of gravitation.

20. A heavy truck and bike are moving with the same kinetic energy. If the mass of the truck is four times that of the bike, then calculate the ratio of their momenta. (Ratio of momenta = 1:2

21. 1 x 7 = 7
22. Calculate the mass of a body weighting 100 dyne. g = 10 m/s2.