Work And Energy Test

Result

Work And Energy Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

300 J of work is done in sliding a 2 kg block, up an inclined plane to a height of 10 meters. Taking value of acceleration due to gravity 'g' to be 10 m/s², work done against friction is

A
100 J

B
200 J

C
300 J

D
400 J

Solution

Work done = 2 × 10 × 10 + w_f
(w_f= work done against friction)
300 = 200 + w_f
w_f= 100J
Question 2
1 / -0

The following question has four choices out of which ONLY ONE is correct.

A force of 60 N is applied on a body at an angle of 60° with a horizontal, and displaces it through 5 m along horizontal. What is the work done?

A
50 J

B
150 J

C
100 J

D
75 J

Solution

F = 60 N
θ = 60^o
S = 5 m
W = FS cos θ
= 60 x 5 x cos 60^o
= 60 x 5 x 1/2 = 150
= 150 J