Flashcards in paper 2 : forces Deck (87)

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1

## what is a scalar quantity

### a scalar quantity is a measurement with only magnitude(size)

2

## what is a vector quantity

### a vector quantity is a measurement withe magnitude and direction

3

## what is a force

### a force is a push or pull that acts on an object

4

## what are some examples of scalar quantities

###
some examples of scalar quantities are :

-speed

-mass

-light intensity

-temperature

-distance

5

## what are some examples of vector quantities

###
some examples of vector quantities are:

-velocity

-friction

-momentum

-force

-displacement

6

## what is meant by 'normal contact force'

### normal contact force is when an object on a flat surface experiences a force perpendicular (at 90 degrees) to the surface

7

## what is weight

### weight is the force acting on an object due to gravity

8

## what can cause an objects weight to alter

### a persons weight can change a]according to the strength of the gravitational field where the object is at

9

## how is weight and an objects mass related

### an objects mass and weight are directly proportional

10

## how do you calculate the weight of an object

###
weight = mass x gravitational field strength

(W=mg)

11

## what is weight measured in

### weight is measured in Newtons (N)

12

## what is gravitational field strength measured in

### gravitational field strength is measured in N/Kg

13

## what is a 'resultant force'

###
a resultant force is a single force that has replaced a number of forces.

a resultant force still has the same effect as all the other forces acting together

14

## what is newtons first law

### newtons first law is : an object in motion will stay in motion at the same velocity until a force is applied

15

## when is 'work done'

### work is done when a force causes an object to move through a distance

16

## how do you calculate work done

###
work done = force x distance(along the line of action of the force)

W=Fs

17

## what is one joule of work equivalent to

### one joule of work is equivalent to when a force of 1 newton causes a displacement of 1m

18

## how can you convert joules to newton metres

### 1 joule = 1 newton metre

19

## what happens to the temperature of an object when work is done

### when work done occurs against the frictional forces already acting on an object, the object experiences a temperature increase

20

## what is elastic deformation

### elastic deformation is when an object can return to its original shape and size after all forces applied have been removed

21

## what is inelastic deformation

### inelastic deformation is when an object is unable to return back to its original shape and size, after all forces applied have been removed

22

## what is the limit of proportionality

### the limit of proportionality is the maximum amount of force which can be applied to an object before it is no longer able to return back to its original shape and size

23

## how are force and extension related

### extension is directly proportional to the amount of force applied

24

## how do you calculate the force applied to a spring

###
force = spring constant x extension

F=ke

25

## how can the calculation for, the force applied to a spring, be adapted when you are given how much a spring has been compressed

### when you are given how much a spring has been compressed, you input the difference between the natural length and compressed length, into the 'e' part of F=ke

26

## what type of energy transfers occur when a spring in stretched or compressed

### when a spring is stretched or compressed, work is done and elastic potential energy is stored in the spring.

27

## how are the values for work done on a spring and the elastic potential energy stored in an spring related

### the values for work done on a spring and the elastic potential energy stored in an spring are equal, only if the spring is not inelastically deformed

28

## how can the work done in stretching or compressing a spring be calculated

###
the work done in stretching or compressing a spring be calculated using the equation :

Ee=0.5 x k (e)^2

29

## what is a turning effect also known as

### a turning effect also known as the moment of the force

30