5.3 Resultant Forces And Work Done

Question 1

If a skydiver is pulled down due to his weight what is the force acting on him in the opposite direction

Answer 1

Drag ( air resistance)

Question 2

If there is a number of forces acting on a single point what can you do ?

Answer 2

Replace it with a single force (resultant force) that has the same effect as all the other forces together

Question 3

How do you find the resultant force ?

Answer 3

Add those in same direction

Subtract those in the opposite direction

Question 4

When a force moves and object through a distance what happens ?

Answer 4

Energy is transferred and work is done

Question 5

What does the thing applying the force need ?

Answer 5

A source of energy

Question 6

To move and object what needs to happen ?

Answer 6

The force has to do ‘work’ to move it and energy is transferred from on store to another

Question 7

Work done equation

Answer 7

Work done = force x distance

Question 8

Example of energy transferred and work done ?

Answer 8

Push something against rough surface -work done

Energy transferred from kinetic stores to thermal stores