The following is not a law of static friction:

Dynamic friction as compared to static friction is

A

Same

B

More

C

Less

D

May be less of more depending on nature of surfaces and velocity

The ratio of static friction to dynamic friction is always

A

Equal to one

B

Less than one

C

Greater than one

D

None of these

Static friction is always __________ dynamic friction.

A

Equal to

B

Less than

C

Greater than

D

None of these

In which of the following circumstance should you use a static reference to a non static method?

A

Making a method call using parent

B

Making a method call using child

C

Making an object call using parent

D

Making an object call using child

The static friction

A

bears a constant ratio to the normal reaction between the two surfaces

B

is independent of the area of contact, between the two surfaces

C

always acts in a direction, opposite to that in which the body tends to move

D

all of the mentioned

The dynamic friction is the friction experienced by a body, when the body

A

is in motion

B

is at rest

C

just begins to slide over the surface of the other body

D

none of the mentioned

Coulomb friction is the friction between

A

Bodies having relative motion

B

Two dry surfaces

C

Two lubricated surfaces

D

Solids and liquids

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

A

Magnitude of the forces on journal

B

Angular velocity of journal

C

Clearance between journal and bearing

D

Radius of journal

For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)

A

$$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$

B

$$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

C

$$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$

D

$$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$

The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$ = Coefficient of friction between the shaft and bearing)

A

$${\text{r}}\sin \varphi $$

B

$${\text{r}}\cos \varphi $$

C

$${\text{r}}\tan \varphi $$

D

$$\frac{{\text{r}}}{2}\cos \varphi $$

The following is not a law of static friction:

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