Forces in action

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Question 31
Medium
a.

A worker uses a pry bar (lever) to lift a heavy wooden crate.

A straight pry bar resting on a pivot. The long left arm of the pry bar, from the pivot to the end where the downward effort force is applied, has a length of 1.6 m. The short right arm, from the pivot to the end where the upward load force acts on the wooden crate, has a length of 0.25 m.

Explain why the effort force needed to lift the crate is less than the load force.

[2]
b.

The effort force needed to lift the crate is 120 N120\text{ N}120 N.

Calculate the load force.

[3]
c.

The worker places a toolbox on a level floor.

Describe the two forces in the interaction (action-reaction) pair between the toolbox and the floor.

[2]
d.

Describe the forces acting on the toolbox that would appear in its free-body diagram, specifying their names, directions, and relative magnitudes.

[2]

Forces in action Questions

  1. GCSE
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  3. /Forces in action