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Year 9 Science > Forces and Motion > Flashcards

Flashcards in Forces and Motion Deck (49)
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1

Upthrust

upwards force on a body due to displacement of water around it. sometimes called bouyancy

2

Lift

upwards force on an aeroplane

3

Weight

force due to gravitational attraction

4

Friction

force created my particles rubbing of surfaces that opposes motion

5

air/water resistance

frictional force caused by particles colliding with the body that opposes motian

6

magnetic

force caused by magnetic attraction

7

Electrostatic

force caused by attraction between charges

8

reaction

forces created by a body as a reaction to a force being applied

9

compression

Force on a body when it is being squashed

10

Tension

force on a body when it is being stretched

11

non-contact

if two objects or materials dont need to be touching for a force to have an effect

12

contact

if two objects or materials need to be touching for an force to have an effect

13

what are the two types of friction

static friction and dynamic friction

14

what is static friction

force to prevent an object from starting to move

15

what is dynamic friction

force that acts when something has started moving

16

equation for average speed

average speed = total distance divided by total time

17

equation for acceleration

acceleration = change in velocity divided by change in time

18

equation to find the force

force - mass times acceleration

19

equation for weight

mass times gravitational field strength

20

what is weight

weight is the force that pulls all objects to the centre of the planet, it depends on the mass and gravitational field strength of an object.

21

what would happen to your weight if it went to a place of a different gravitational field strength

it would change

22

what would happen to your mass if you went to a place of a different gravitational field strength

it would stay the same since the amount of matter hasnt change only the gravitational field strength

23

when would a falling parachutist reach terminal velocity

when its air resistance and weight are the same

24

what is a ticker timer

ticker timer is a tape that marks dots to measure speed and it does this by marking dots at at a certain rate to show distance travelled in a certain time

25

what is the rate of a ticker timer

50 dots per second (1/50s)

26

what is balanced forces

balanced forces is two forces going in opposite directions that have the same amount of newtons and balance each other out

27

what is unbalanced forces

unbalanced forces is when forces acting on an object are not equal and have different amount of newtons, it causes an object that doesn't move to move and an object moving to change speed or direction

28

what is a resultant force

a resultant force is made when there is forces acting on an object, when it is zero then the object wont change what its doing but when it isn't zero it will make un unbalanced force

29

what does stationary look like on a distance time graph

a flat horizontal straight line

30

what does a constant speed look like on a distance time graph

a tilted straight line