Question

a bag of rice of mass 35 kg is lifted onto a shelf 1.5 m above the ground,determine the amount of force required to lift 35 kg.

Answer 1

Explanation:

The amount of work required to complete an action can be represented by the expression

F

⋅

d

, where F represents the force used and d represents the distance over which that force is exerted.

The amount of force required to lift an object is equal to the amount of force required to counteract gravity. Assuming the acceleration due to gravity is

−

9.8

m

s

2

, we can use Newton’s second law to solve for the force of gravity on the object.

F

g

=

−

9.8

m

s

2

⋅

35

k

g

=

−

343

N

Because gravity applies a force of -343N, to lift the box one must apply a force of +343N. In order to find the energy required to lift the box half a meter, we must multiply this force by half a meter.

343

N

⋅

0.5

m

=

171.5

J

Hope it helps!!