# Forces (work, effects and matter) (topic 8,9 and 15) Flashcards Preview

## Physics GCSE > Forces (work, effects and matter) (topic 8,9 and 15) > Flashcards

Flashcards in Forces (work, effects and matter) (topic 8,9 and 15) Deck (17)
1
Q

What is the equation for work done?

A

Force x distance

2
Q

What is the equation for weight?

A

Mass x 9.81(gravitational field strength)

3
Q

What is a scalar quantity?

A

Just Magnitude

4
Q

What is a vector quantity?

A

Magnitude with direction

5
Q

What is the equation to work out weight?

A

mass x gfs (9.81)

6
Q

What is the equation for work done against gravity?

A

weight x distance

7
Q

What is work done?

A

The amount of energy transferred measured in joules

8
Q

What is power?

A

The rate of work done so how fast the energy is transferred

9
Q

What is the equation to work out power?

A

work done/time
or
energy transferred/time

10
Q

How do you find the resultant force when there is a direction?

A

1) Draw a triangle with the two forces labelled and choose an appropriate scale factor (e.g. 1cm = 5m)
2) measure the hypotenuse and times by the scale factor to find resultant force
2) Work out the hypotenuse using a2 + b2 = c 2 to check

11
Q

What is the equation to work out pressure?

A

force/area

12
Q

What is the equation to work out pressure in a fluid?

A

height x density x 9.81

13
Q

What is atmospheric pressure? (actual number)

A

100,000 pascals

14
Q

What is up thrust?

A

The difference between the pressure above and the pressure below

15
Q

What is elastic deformation?

A

when a an object will return to its original shape after the forces stretching it have been removed

16
Q

What is inelastic deformation?

A

When an object will not return to its original shape after the forces stretching it have been removed

17
Q

What is the equation to work out energy transferred in stretching?

A

0.5 x spring constant x extension [squared]