Flashcards in Yr 10 - Physics Deck (41):

1

## Name contact forces.

### Friction, air and water resistant, thrust

2

## Name non-contact forces:

### Gravitational, magnetic, electrostatic

3

## What is the SI unit of force

### newton (N)

4

## What is the effect of balanced and unbalenced forces.

### Balanced is when the resultant force is 0 because all forces are equal. Unbalanced force is when the resultant force is bigger or smaller than 0.

5

## What is the resultant force.

### Sum of all the forces that act on the object.

6

## Define friction.

### The resistance an object encounters when moving on the surface of another.

7

## Why does friction cause heat.

### Because friction is caused by movement of atoms and the faster movement means more heat generated.

8

## What axis is the independent var?

### X

9

## What axis is the dependent var?

### Y

10

## Define speed.

### The rate of change of distance covered in a given time

11

## Define acceleration.

### Rate of change of speed on a given body over time

12

## Unit speed.

### m/s

13

## Unit acceleration.

### m/s²

14

## How to calculate force.

### F = MA (force = mass * accelaration)

15

## Define mass.

### Is the amount of matter an object has

16

## Unit of mass

### kg

17

## Define weight

### Is the amount of gravitational force acting on an object

18

## Unit of weight

### newtons (N)

19

## On the moon what would be different

### your weight - depends on gravity

20

## What is gravity

### 10 N/kg

21

## How is m/s² related to N/kg?

### They are the same thing

22

## Define velocity.

### Combination of speed and direction.

23

## Unit of velocity.

### m/s

24

## Example of velocity and acceleration.

###
V = North at 5m/s.

A = 5m/s².

25

## How calculate final velocity

###
Vf = Vi + a * t

Vf: final velocity

Vi: initial velocity

a: acceleration

t: time

26

## Define terminal velocity

### The constant speed attained by a body under the force of gravity when the resultant force is 0

27

## How to calculate weight

### W = M*G

28

## What is delta V and how to calculate.

### Change in Velocity and its Vf - Vi

29

## How to calculate velocity.

### V = A*T

30

## How to calculate distance

### D = S*T

31

## What's on the x-axis?

### Independent

32

## What's on the y-axis?

### Dependant

33

## How to calculate diagonal force.

### Pythagoras horizontal and vertical.

34

## How does speed relate to drag?

### Drag is the friction force created by air resistance. As speed increases so does drag. Eventually the forces become balanced and drag equals thrust. This means the speed is constant and the resultant force = 0.

35

## how to decrease friction?

### Make the object aerodynamic to reduce drag because it would break through air particles easier. Make smoother surface because less interaction of molocules. Less mass to help F = MA.

36

## Gravity on moon.

### 1.6N

37

## How to calculate distance in speed time graph?

### Calculate area and divide by two.

38

## Define force

### a push or pull acting on an object

39

## What axis is speed on

### y

40

## What axis is time on

### x

41