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