(5) Work Done

Question 1

What does it mean when a force does ‘work’?

Answer 1

The force causes an object to be displaced through a distance

Question 2

What’s the equation for work done?

Answer 2

Work done = force x distance
(Joules) (newtons) (Meters)

Question 3

What is the distance used when calculating work done?

Answer 3

The distance that is moved along the line of action of the force

Question 4

Under what circumstance is is 1 joule of work done?

Answer 4

When a force of 1 newton caused a displacement of 1 meter. 1 joule = 1 newton meter

Question 5

What happens when work is done against frictional forces?

Answer 5

• a rise is temperature
• kinetic energy is converted to heat

Question 6

Why does air resistance slow down a projectile?

Answer 6

• the object does work against he air resistance
• the kinetic energy is converted to heat, slowing down the object