Chapter 7 Application of forces - Year 2

Question 1

If a box is in limiting equilibrium with a force pushing it up a rough slope when will the force be at its maximum?

Answer 1

When forces up the slope = forces down the slope

Question 2

What are the 3 things that we do in this topic?
Why?

Answer 2

Up and down
Left and right
Moments

These must all be balanced for a rod to be in equilibrium

Question 3

Which way do ladders tend to fall?

Answer 3

They tend to split down a wall (to the left)

Question 4

Where are there reaction forces with a ladder?

Answer 4

Wherever it contacts a wall or peg or beam etc (right angles to plane of contact)

Question 5

What is usually messing people up?

Answer 5

The forces from a hinge is random

Question 6

How do you work out the resultant force on a pulley?

Answer 6

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Question 7

What do the harder questions ask you to do?
Explain the main but of doing them?

Answer 7

Find a range of values
You need to consider if it moves up or down a plane

Question 8

Why does the reaction force from a peg act at a right angle?

Answer 8

It is considered to be smooth