Question

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Fractice Problems 8 :
1. A force of 40 N is required to pull up cylindrical barrel of mass 2.5 kg through a distance of 7.5 m along the
inclined plane as shown in diagram alongside. Calculate.
(a) Force of gravity acting on the barrel. (Take g = 10 ms )
(b) Work done by the force in pulling body along the inclined plane
(c) Work done against the force of gravity.
(a) 25 N, (b) 300 J, (c) 93.25 J]
7.5 m
40N
30°
B
29​

Answer 1

Answer:

1)Force of gravity= mass × acceleration

2.5 × 10

25N

2)work done = force × displacement

40 × 7.5

4×75

300

3)work done against the gravity = m×g×h

2.5×10×7.5

25×7.5

187.5

Answer 2

Answer:

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1 ). Force of gravity = mass × acceleration

= 2.5 ×10

=25

2) Work done = force × displacement

= 40 ×7.5

= 4×75

=300

3) work done against the gravity = m×g× h

= 2.5 × 10 × 7.5

= 25 × 7.5

= 187.5

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