Flashcards in General Physics Deck (49)

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1

## In a fair test, what we change is

### independent variable

2

## In a fair test, what we measure is

### dependent variable

3

## Definition of accuracy

### how closely your answers match an already true answer

4

## Definition of precision

### how small a measurement is

5

## Definition of reliability

### can someone else do the same experiment and get the same result

6

## Definition of validity

### you need to carry out a fair test to make sure results are valid

7

## Definition of periodic

### anything that repeats itself over a fixed interval of time

8

## Speed

### Distance/Time

9

## How to calculate distance in a speed-time graph?

### The area under the graph

10

## Difference between speed and velocity

### Velocity is speed with a given direction or Speed is scalar and velocity is vector

11

##
The acceleration of free fall for a body near

to the Earth is

### constant/ terminal speed or velocity/ 10m/s2

12

## acceleration

###
change of velocity per second

(v-u)/t

13

## When free falling,how does the object has terminal speed?

### First, there will be acceleration due to gravity. As you accelerate, resistance gets bigger. Until the forces are balanced -> terminal speed

14

## Weight

###
is a force but mass isn't

= mass x gravity

15

## Definition of inertia

### The inertia of an object is its resistance to a change of its motion

16

## Greater the mass of an object,

### greater the inertia

17

##
Describe, and use the concept of, weight

as the effect of a gravitational field on a

mass

### The weight of an object depends on location (example, pg 19 textbook)

18

## Density equation

### = mass/volme (g/cm3)

19

## Measuring the density of regular solid object

###
1. Measure the mass

2. Measure its dimensions and find the volume

3. Do the calculation

20

## Measuring the density of an irregular object

###
1. Measure the mass.

2. Displacement method

21

## Archimedes Principle

###
weight of displaced water < weight of object= sink

weight of displaced water >weight of object= float

22

## Hooke's Law

### F=kx (k is spring constant, F is force, x is extension)

23

## The extension of the spring is directly proportional

### to the weight

24

## Resultant force equation

### Resultant force = mass x acceleration

25

## Moment equation

### = force x perpendicular distance to pivot

26

## The moment of a force

### is the turning effect. examples

27

## Conditions for equilibrium

###
no resultant force on it

no resultant turning effect on it

28

## Principle of Moments

### sum of clockwise moments about a point = sum of anticlockwise moments about that point

29

## Definition of centre of mass

### the point where all the mass seems to be concentrated

30