Friction Test

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Friction Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Consider the given statements and select the correct option which correctly identifies true (T) and false (F).

(i) When a body is in steady motion on a surface, the force of friction is dynamic friction.

(ii) The force of friction between two bodies always acts parallel to the surface in contact with each other.

(iii) It is easier to push a lawn roller than to pull.

(iv) Limiting friction is greater than sliding friction.

A

(i) (ii) (iii) (iv)

T F T F

B

(i) (ii) (iii) (iv)

F T F T

C

(i) (ii) (iii) (iv)

T T T F

D

(i) (ii) (iii) (iv)

T T F T

Solution

Pushing a lawn roller is harder than pulling it because friction is greater in case of pushing.
Question 2
1 / -0

A box was pushed equal distance on four different surfaces. The force needed for each surface was recorded in the given table.

Surface M N O P

Force Needed (N) 670 570 320 500

On which surface was the friction least?

A
M

B
N

C
O

D
P

Solution

Friction opposes the motion of an object. For surface O, force needed to push the box is least i.e., 320 N, so it has least friction.
Question 3
1 / -0

Complete the passage using the suitable words given in option below.

A rough surface will offer a ___(i)___ frictional force than a smooth surface. The heavier the object, the ___(ii)___ will be the frictional force. Friction is a ___(iii)___ force.

A

(i) (ii) (iii)

Lower Greater Resistive

B

(i) (ii) (iii)

Greater Lower Contact

C

(i) (ii) (iii)

Greater Greater Contact

D

(i) (ii) (iii)

Lower Lower Resistive
Question 4
1 / -0

Identify the methods of increasing and decreasing friction and choose the correct option.

(i) The tyres of vehicles have treads.

(ii) Gymnasts often apply a coarse material on their hands.

(iii) Saliva in our mouth helps us to swallow food.

(iv) A surgeon powders his hand before pulling on his plastic gloves

A

(i) (ii) (iii) (iv)

Increasing Decreasing Increasing Decreasing

B

(i) (ii) (iii) (iv)

Decreasing Increasing Decreasing Increasing

C

(i) (ii) (iii) (iv)

Increasing Increasing Decreasing Decreasing

D

(i) (ii) (iii) (iv)

Decreasing Decreasing Increasing Increasing

Solution

Tread in tyre of vehicle increases resistance with the road to prevent skidding. To dry the hands by applying a coarse material increases the friction. Saliva reduces the friction in mouth so that food can be easily swallowed. Powder can reduce the friction so that gloves of the surgeon can be easily pulled.
Question 5
1 / -0

In which of the following cases the friction is helpful (H) and troublesome (T)?

(a) Lighting a matchstick

(b) Applying the brakes on a cycle

(c) Use a towel to open tightly closed lid of a bottle

(d) Pulling drawer out of a desk

A

(a) (b) (c) (d)

T T H H

B

(a) (b) (c) (d)

H H T T

C

(a) (b) (c) (d)

T T T H

D

(a) (b) (c) (d)

H H H T
Question 6
1 / -0

Read the given statements and select the correct option.

Statement 1: It takes a much longer time and covers more distance to stop a moving ship in water than a moving car with same speed on the road.

Statement 2: The friction on water surface is much less than the solid surface.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true but statement 2 is false.

D
Statement 1 is false but statement 2 is true.

Solution

Water surface offers less resistance to the ship than the road to the car. Hence, a ship covers a longer distance and takes longer time before stop.

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Re-Attempt Weekly Quiz Competition

(i)	(ii)	(iii)	(iv)
T	F	T	F

(i)	(ii)	(iii)	(iv)
F	T	F	T

(i)	(ii)	(iii)	(iv)
T	T	T	F

(i)	(ii)	(iii)	(iv)
T	T	F	T

Friction Test - 5

Result

Friction Test - 5

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Question 1

(i) (ii) (iii) (iv) T F T F

(i) (ii) (iii) (iv) F T F T

(i) (ii) (iii) (iv) T T T F

(i) (ii) (iii) (iv) T T F T

Solution

Question 2

M

N

O

P

Solution

Question 3

(i) (ii) (iii) Lower Greater Resistive

(i) (ii) (iii) Greater Lower Contact

(i) (ii) (iii) Greater Greater Contact

(i) (ii) (iii) Lower Lower Resistive

Question 4

(i) (ii) (iii) (iv) Increasing Decreasing Increasing Decreasing

(i) (ii) (iii) (iv) Decreasing Increasing Decreasing Increasing

(i) (ii) (iii) (iv) Increasing Increasing Decreasing Decreasing

(i) (ii) (iii) (iv) Decreasing Decreasing Increasing Increasing

Solution

Question 5

(a) (b) (c) (d) T T H H

(a) (b) (c) (d) H H T T

(a) (b) (c) (d) T T T H

(a) (b) (c) (d) H H H T

Question 6

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

Statement 1 is true but statement 2 is false.

Statement 1 is false but statement 2 is true.

Solution

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(i) (ii) (iii) (iv)

T F T F

(i) (ii) (iii) (iv)

F T F T

(i) (ii) (iii) (iv)

T T T F

(i) (ii) (iii) (iv)

T T F T

(i) (ii) (iii)

Lower Greater Resistive

(i) (ii) (iii)

Greater Lower Contact

(i) (ii) (iii)

Greater Greater Contact

(i) (ii) (iii)

Lower Lower Resistive

(i) (ii) (iii) (iv)

Increasing Decreasing Increasing Decreasing

(i) (ii) (iii) (iv)

Decreasing Increasing Decreasing Increasing

(i) (ii) (iii) (iv)

Increasing Increasing Decreasing Decreasing

(i) (ii) (iii) (iv)

Decreasing Decreasing Increasing Increasing

(a) (b) (c) (d)

T T H H

(a) (b) (c) (d)

H H T T

(a) (b) (c) (d)

T T T H

(a) (b) (c) (d)

H H H T