Work and Power Flashcards Preview

Physics Module 3 > Work and Power > Flashcards

Flashcards in Work and Power Deck (12):
1

Recall everyday examples in which work is done and
power is developed

• lifting weights
• climbing stairs
• pulling a sledge
• pushing a shopping trolley.

2

Describe how energy is transferred when work is
done.

Work done and energy transferred are measured in joules (J). The work done on an object can be calculated if the force and distance moved are known

3

What does the amount of work done depends on?

• the size of the force in newtons (N)
• the distance travelled in metres (m)

4

What is joule (J) the unit for?

work and energy

5

Equation for work done

work done = force × distance

6

Describe power

a measurement of how quickly
work is being done

7

Units for power

watts (W)

8

What do cars have?

• have different power ratings
• have different engine sizes
which relate to fuel consumption

9

Equation for weight

weight = mass × gravitational field strength

10

Equation for power

power = work done / time

11

What does car fuel consumption depends on?

- the engine size, larger engines use more fuel
- the force required to work against friction
-driving style and speed - more accelerating and braking uses more fuel
- road conditions
- pressure

12

Drawbacks of high car fuel consumption:

- expensive for the driver
- damaging to the environment