Unit 3 Equations Flashcards Preview

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Flashcards in Unit 3 Equations Deck (40):
1

What quantity is speef

Scalar

2

Velocity quantity

Vector

3

Calculate resultant force

biggest force- other forces = resultant force

4

Newtons law (actions)

For every action there is an equal and opposite reaction

5

What happens if resultant force on a stationary object is zero

It remains stationary

6

What happens if the resultant force on a moving object is zero

Then the object remains moving at a constant velocity (same speed and direction)

7

What can unbalanced forces cause

A change in motion

8

What if the forces are balanced

There will be no change in motion so they are stopped or at a steady speed

9

What happens the heavier something is

The more force is needed to make it accelerate

10

Lighter something is?

Less force is needed to make it accelerate

11

Equation linking force and mass

Force = mass x acceleration

12

How to calculate inertia mass

M= f/a

13

What is the extension of a siding directly proportional to

The force applied to it

14

Spring constant equation

Force = spring constant x extension

15

Work out constant

Convert cm to m
Work out distance stretched from original
F➗e

16

100g in newtons

1 N

17

What happens when a spring reaches its elastic potential

It won't return to its original length as it's been over stretched

18

What is mass proportional to

The weight

19

Weight and gravity equation

Weight = mass x gravity

20

Newtons laws?

One: resultant force is needed to make something start moving speed up slowdown or change direction

two: An objects acceleration is directly proportional to the resultant force acting on it

3: two interacting objects will exert equal and opposite forces on each other

21

Work equation

Work done = force x distance moved in direction of force

22

What does 1 joule equal

1 newton metre

23

What does gradient equal

Change in vertical ➗ horizontal change

24

Average: 1.) walking 2.) running 3.) cycling speeds?

1.) 1.5m/s
2.) 3m/s
3.) 6 m/s

25

Acceleration with velocity

Acceleration= change in velocity ➗ time taken

26

What does
1.) the uphill sections
2.) the downhill sections
3.) a curve
4.) area underneath
Mean in a velocity time graph

1.) acceleration
2.) deceleration
3.) changing acceleration
4.) distance travelled

27

Motion equation

Final velocity squared - initial velocity squared = 2 x acceleration x distance

28

What is the average persons reaction time

Around 0.5 seconds

29

Kinetic energy equation

Kinetic energy = 1/2 x mass x velocity squared

30

Momentum equation

Momentum = mass x velocity

31

What equation calculates reducing acceleration

Acceleration = final velocity- initial velocity ➗ time

32

Force with change in momentum

Force = change in momentum ➗ time of collision

33

Moment equation

Moment= force x perpendicular distance from pivot

34

Pressure (normally)

Force normal to surface ➗ area of that surface

35

Pressure at depth

Pressure = density x gravitational field strength

36

Rough density of water that should be used if not given in exam

1000

37

What's upthrust equal to

The weight of the water displaced

38

Density?

Mass ➗ volume

39

Calculating forces

Mass x acceleration

40

Gravitational field strength

Mass x field strength x height