The phenomenon of collision of two elastic bodies takes place because bodies

Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

A

Is directly proportional to their velocity of approach

B

Is inversely proportional to their velocity of approach

C

Bears a constant ratio to their velocity of approach

D

Is equal to the sum of their velocities of approach

Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?

A

Tensile strength

B

Elastic limit

C

Proportional limit

D

Yield strength

During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

A

Equal to

B

Equal and opposite to

C

Less than

D

Greater than

The total time of collision and restitution of two bodies, is called

A

Time of collision

B

Period of collision

C

Period of impact

D

All the above

A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?

A

Steel

B

Glass

C

Rubber

D

Brass

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?

A

E = 2G (1 + v)

B

E = G (1 + v)

C

$${\text{E}} = \frac{{{\text{G}}\left( {1 + {\text{v}}} \right)}}{2}$$

D

E = 2G (1 + 2v)

All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain

A

Increases very quickly

B

Decreases very quickly

C

Increases in proportion to stress

D

Decreases in proportion to stress

A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

A

v

B

2v

C

4v

D

8v

When two elastic bodies collide with each other,

A

The two bodies will momentarily come to rest after collision

B

The two bodies tend to compress and deform at the surface of contact

C

The two bodies begin to regain their original shape

D

All of the above

For perfectly elastic bodies, the value of coefficient of restitution is

A

0

B

0.5

C

1

D

0.25

The phenomenon of collision of two elastic bodies takes place because bodies

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