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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

Describe qualitatively the effect of the position of
the centre of mass on the stability of simple objects

centre of the mass is low -> stable
wide base -> stable