Question

A child pushes down on a box lid with a force of 25 N. At
the same time, her friend pushes down on the lid with a force of
30 N. The spring on the box lid pushes upward with a force of 60
N. Can the children close the box? Why or why not?

Answer 1

We need to find whether the two children applying a force can close a box when its lid is being pushed up by a spring.

The children cannot close the box as the force the children applying is less than the force the spring is applying.

The force that one child is providing is 25 N and the other child is 30 N. The force is being applied downward.

The spring on the lid is applying a force of 60 N upwards.

In order to close the lid a force more than 60 N is required downward.

The total force applied to the lid is 55 N which less than the force the lid is applying so the children will not be able to close the lid.

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