• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2

# Physics nptes key definitions. Newtons Law And Momentum, Circular Motion And Oscillations, Thermal Physics

Extracts from this document...

Introduction

Physics Unit 1: The Newtonian World

## Module 1: Newton’s Law And Momentum

• Newton’s First Law – A force is necessary to change the state of rest or of uniform motion in a straight line of a body
• Momentum/Linear Momentum – The mass of an object multiplied by its velocity
• Newton’s Second Law – The rate of change of the momentum of an object is directly proportional to the resultant net force acting upon it
• One Newton is the force that gives a mass of one kilogram an acceleration of one metre per second each second
• Mass – The inertia of an object/how difficult it is to accelerate an object

Middle

Inelastic Collision – Momentum is conserved, but kinetic energy is not

## Module 2: Circular Motion And Oscillations

• Radian – The angle subtended at the centre of a circle by an arc of length equal to the circle’s radius
• Period – The time taken to complete one revolution
• Centripetal Acceleration – The acceleration of a body moving in a circle with a constant speed
• Field – The region in which a force operates
• Gravitational Field Strength – The force acting per unit mass at that point
• Newton’s Law Of Gravitation – The gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them

Conclusion

• Phase – Whether a substance is a solid, liquid or a gas
• Internal Energy – The sum of the random distributions of kinetic and potential energies of all the molecules in the body
• Ideal Gas – A gas that has internal energy only in the form of random kinetic energy
• Thermal Equilibrium – Two objects at the same temperature
• Specific Heat Capacity – The quantity of thermal energy required to raise the temperature of a unit mass of a substance by a unit temperature rise
• Specific Latent Heat – The quantity of energy per unit mass required to change it at constant temperature from a  solid into a liquid
• Boyle’s Law – The volume of a fixed mass of gas is inversely proportional to the pressure exerted on it, provided the temperature is kept constant

This student written piece of work is one of many that can be found in our AS and A Level Mechanics & Radioactivity section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

## Here's what a star student thought of this essay

3 star(s)

### Response to the question

The candidate has summarised key points that are relevant to this topic. They have managed to include most of the points outlined on the specification and for the most part the information provided is extremely accurate. This demonstrates a good ...

### Response to the question

The candidate has summarised key points that are relevant to this topic. They have managed to include most of the points outlined on the specification and for the most part the information provided is extremely accurate. This demonstrates a good understanding of underlining principles.

### Level of analysis

Generally the information that the candidate has stated is accurate, though there are a few errors. For example in the first section, when stating Newton’s second law of motion, the candidate has failed to mention that the change in momentum and the net force must be in the same direction. There is also key information missing, for example the candidate fails to mention that momentum is a vector quantity, which is essential when solving problems related to the momentum of given objects, if you fail to state the direction of the velocity of an object your calculations will be incorrect. In addition to this, the section on module three is relatively short and seems to be missing some important facts such as the concept of internal energy related to state changes, a description of Brownian motion and several other points. The candidate’s work could be improved with additional details and further development of key points, for example, when discussing the definitions used for an object demonstrating simple harmonic motion, it would be appropriate to provide graphs of displacement, velocity and energy as these need to be understood and can be tested on in examinations.

### Quality of writing

The candidate uses technical terms accurately and clearly demonstrates a good understanding of this topic. In addition the language used to describe key terms is of the standard I would expect from a grade A/B candidate. Furthermore there are no issues with spelling or grammar and the information is displayed in a clear and coherent manner.

Reviewed by pictureperfect 26/06/2012

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Mechanics & Radioactivity essays

1. ## Investigating the factors affecting tensile strength of human hair.

A gentle oxidising agent (usually hydrogen peroxide) is treated to the hair to make the sulphur bonds reform. This results in a 'permanent wave'. (Figure 3 shows the breaking and reforming of sulphur-sulphur bridges can produce permanent changes in the shape of protein molecules). Permed hair has only 90% of the original disulphide bonds, which leaves hair weaker than before it was permed.

2. ## Investigating the strength of a Supermarkets plastic bag.

by only half a Newton so that more results can be recorded. Whilst carrying out the experiment we did record a set of results as follows- Experiment 1 Force(N)

1. ## Objectives: To determine the center of gravity of a body of irregular shapes

The motion of the board disturbs us to mark the intersection points on the edges. As a result, the intercept point of the lines drawn on the paper do not really represents the center of gravity of the irregularly shaped board.

2. ## physics investigation- stopping distance

not change as the amount of extra momentum it gains will be cancelled out with the increased friction. I will extend my investigation to try and work out this quantity of mass. Test 4 Here I will again be using a toy car and I will change the mass using

1. ## Measure the earth's gravitational field strength.

The parts equation represent as follows, y = y axis, x = x axis, m = gradient, c = intercept. When this is put into the equation of a straight line the lines are replaced as follows, a = y, sin ??= x, g = m, (-F / m)

2. ## Centripetal force

50 revolutions of the bungs was timed and the angular velocity was calculated. 7. The experiment was repeated in several times using different lengths L of the string. Precautions 1. The position of the label should be just below the glass tube.

1. ## Physic lab report - study the simple harmonic motion (SHM) of a simple pendulum ...

Also plot a graph of acceleration against time. Results and Measurements: (Copied from the data of MVA software) Values of velocity is found by the equation: (x2-x1)/(t2/t1), whereas x1=-7.54E-02 x2= -4.08E-02, t1=0.00E+00 ,t2=6.67E-02 Values of acceleration is found by the equation: (v2-v1)/(t2-t1)

2. ## Mass on a spring - and investigation into resonance

We recorded all of our measurements which are shown below. We felt that we could improve our accuracy further by performing a couple of trial experiments to see how we could improve upon our initial ideas. Our trials did not suggest any obvious improvements so we continued with the above method and recorded the following results.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to