Momentum - Equation

Test yourself

Momentum

The momentum of an object is its mass multiplied by its velocity.

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Equation for momentum

The equation for calculating momentum is:
- $p = mv$
- Momentum = mass × velocity

Units

Momentum is measured in kg m/s.
Velocity is measured in m/s.
Mass is measured in kg.

Conservation of momentum

The law of conservation of momentum says that momentum cannot be created or destroyed.
If two objects collide, the sum of momentum before the collision is equal to the sum of momentum after the collision.

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Conservation of momentum equation

The equation for the conservation of momentum is:
- $m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2$
- (Mass 1 × initial velocity 1) + (mass 2 × initial velocity 2) = (mass 1 × final velocity 1) + (mass 2 × final velocity 2)
In other words, the sum of the momentums of the two objects that are colliding will remain the same after they have collided.

1Energy

1.1Energy Changes

1.1.1Energy Stores

1.1.2Energy Storing

1.1.3Internal Energy

1.1.4Kinetic Energy Storage

1.1.5Gravitational Potential Energy Storage

1.1.6Elastic Potential Energy Storage

1.1.7Calculating Changes in Energy

1.1.8Changes in Kinetic Energy - Calculations

1.1.9Changes in GPE - Calculations

1.1.10Changes in EPE - Calculations

1.1.11Energy Transfers

1.1.12Energy Transfer Examples

1.1.13Conservation of Energy

1.1.14Mechanical Work Done

1.1.15Mechanical Work Done Equation

1.1.16Mechanical Work - Calculations

1.1.17Electrical Work Done

1.1.18Power

1.1.19Electrical Work Done- Calculations

1.2Energy Losses & Efficiency

1.2.1Energy Wastage

1.2.2Efficiency

1.2.3Reducing Energy Loss

1.2.4Power & Energy Transfer

1.2.5Efficiency - Calculations

1.2.6Grade 9 - Energy & Efficiency

1.3Energy Resources

1.3.1Energy Resources

1.3.2Fossil Fuels

1.3.3Geothermal Energy

1.3.4Wind Energy

1.3.5Water Energy

1.3.6Tidal Energy

1.3.7Nuclear Energy

1.3.8Solar Energy

1.3.9Original Source of Energy

1.3.10Non-Renewable & Renewable Resources

1.3.11Uses of Energy Sources

1.3.12Changing Electricity Use

1.3.13Renewable Energy

1.3.14Limits to Renewable Energy Resources

1.3.15End of Topic Test - Energy

1.3.16Exam-Style Questions - Energy

2Electricity

2.1Electric Charge

2.1.1Circuit Diagrams

2.1.2Circuit Symbols

2.1.3Current

2.1.4Current Equation

2.1.5Current - Calculations

2.1.6Conductors

2.1.7Electrical Conductors - Electrons

2.1.8Potential Difference

2.1.9Voltage Equation

2.1.10Measurements in Circuit

2.1.11Voltage - Calculations

2.2Resistance & Electrical Work

2.2.1Resistance

2.2.2Measuring Resistance

2.2.3Resistance Graph

2.2.4Diodes

2.2.5LDRs & Thermistors

2.2.6Electrical Work

2.2.7Power

2.2.8Ohm's Law

2.2.9Ohm's Law - Equation

2.2.10Resistance & Ohms Law - Calculations

2.2.11Electrical Work - Calculations

2.3Electric Circuits

2.3.1Series Circuits

2.3.2Resistors

2.3.3Cells

2.3.4Potential Difference

2.3.5Series Circuits - Calculations

2.3.6Parallel Circuits

2.3.7Parallel Current

2.3.8Parallel Resistance

2.3.9Lights in Parallel

2.3.10Parallel Circuits - Calculations

2.3.11Grade 9 - Circuits

2.3.12Exam-Style Questions - Electricity

2.4Electricity in Homes

2.4.1AC/DC

2.4.2Mains Electricity

2.4.3Power Ratings

2.4.4National Grid

2.4.5Domestic Uses - Calculations

2.4.6Fuses & Circuit Breakers

2.4.7Fuse Ratings

2.4.8Earthing

2.4.9Dangers of the Live Wire

2.4.10End of Topic Test - Electricity

2.5Static Electricity

2.5.1Electrical Charge

2.5.2Charging an Object

2.5.3Charged Objects

2.5.4Static Electricity

2.5.5Electric Fields

2.5.6Field Diagrams

3Particle Model of Matter

3.1States of Matter

3.1.1Atomic Model

3.1.2Atomic Structure

3.1.3Sub-Atomic Particles

3.1.4Models of the Atom

3.1.5Alpha Particles

3.1.6Electron Arrangements

3.1.7Density

3.1.8Density Equation

3.1.9Density & the Particle Model

3.1.10Density - Calculations

3.1.11Changes of State

3.1.12Melting & Boiling

3.1.13Exam-Style Questions - Density

3.2Heat

3.2.1Internal Energy

3.2.2Change in Thermal Energy

3.2.3Specific Heat Capacity Experiment

3.2.4Equation for Heat Capacity

3.2.5Leslie's Cube

3.2.6Internal Energy - Calculations

3.2.7Melting & Boiling

3.2.8Latent Heat

3.2.9Energy Change for Change of State

3.2.10Latent Heat - Calculations

3.2.11Latent Heat Experiments

3.2.12Specific Latent Heat of Vapourisation

3.3Particle Motion in Gases

3.3.1States of Matter

3.3.2Properties of Gases

3.3.3Temperature Increase in a Gas

3.3.4Work Done on a Gas

3.3.5End of Topic Test - Particle Model of Matter

3.3.6Grade 9 - Particle Model of Matter

3.3.7Exam-Style Questions - Specific Heat Capacity

4Atoms & Radiation

4.1Atoms

4.1.1Atomic Model

4.1.2Structure of an Atom

4.1.3Sub-Atomic Particles

4.1.4Alpha Particles

4.1.5The Model of the Atom

4.1.6Electron Arrangements

4.1.7Proton & Nucleon Numbers

4.1.8Atoms & Ions

4.1.9Isotopes

4.1.10Isotopes 2

4.1.11Carbon Nuclides

4.1.12Exam-Style Questions - Atomic Structure

4.2Radiation

5Forces

5.1Basics of Motion

5.1.1Velocity

5.1.2Average Speed

5.1.3Adding Vectors

5.1.4Acceleration

5.1.5Distance vs Displacement

5.1.6Contact & Non-Contact Forces

5.1.7Contact Forces - Examples

5.1.8Distance-Time Graphs

5.1.9Speed-Time Graphs

5.1.10Velocity - Time Graph

5.1.11Average Speed - Calculations

5.1.12Acceleration - Calculations

5.1.13Uniform Acceleration - Calculations

5.1.14Grade 9 - Motion

5.1.15Exam-Style Questions - Motion

5.2Forces

5.3Effects of Forces

5.4Pressure

5.4.1Pressure & Force on Container

5.4.2Atmospheric Pressure

5.4.3Liquid Pressure

5.4.4Pressure - Calculations

5.4.5Liquid Pressure - Calculations

5.4.6Upthrust

5.4.7Depth Control of Submarine

5.4.8Pressure Difference

5.4.9End of Topic Test - Forces

5.4.10Exam-Style Questions - Pressure

6Waves

6.1Wave Basics

6.1.1Wave Basics

6.1.2Wave Speed Formula

6.1.3Wave Speed Equation

6.1.4Wave Speed - Calculations

6.1.5Wave Frequency Formula

6.1.6Wavelength & Amplitude

6.1.7Wave Frequency - Calculations

6.1.8Transverse Waves

6.1.9Longitudinal Wave

6.1.10Required Practical - Ripple Tank

6.2Waves at a Boundary

6.2.1Waves at a Boundary

6.2.2Waves at a Boundary 2

6.2.3Reflection of Light

6.2.4Refraction of Light

6.2.5Refraction of Light 2

6.2.6Internal Reflection

6.3Sound Waves

6.3.1Sound Waves

6.3.2Sound Waves & our Ears

6.3.3Speed of Sound

6.3.4Speed of Sound Experiment

6.3.5Sound as a Wave

6.3.6Uses of Sound Waves: Ultrasound Waves

6.3.7Uses of Sound Waves: Earthquakes

6.3.8Sound Waves - Calculations

6.3.9End of Topic Test - Introduction to Waves

6.3.10Exam-Style Questions - Wave Speed

6.4Electromagnetic Waves

6.4.1Properties

6.4.2Gamma Rays

6.4.3X-Rays

6.4.4UV Light

6.4.5Infrared Radiation

6.4.6Microwaves

6.4.7Radio Waves

6.4.8Properties 2

6.4.9Visible Light

6.4.10Visible Light 2

6.4.11Specular & Diffuse Reflection

6.4.12Colours

6.4.13Grade 9 - Waves

6.5Lenses

6.5.1Lenses

6.5.2Convex Lens

6.5.3Concave Lens

6.5.4Lenses - Calculations

6.5.5Images

6.5.6Ray Diagrams

6.5.7Ray Diagrams 2

6.6Heat & Radiation

6.6.1Infrared Radiation

6.6.2Radiation & Surface Colour

6.6.3Surface Area & Temperature

6.6.4Temperature

6.6.5Absorption & Emission

6.6.6Greenhouse Effect

6.6.7Energy Balance of the Earth

6.6.8End of Topic Test - EM Waves, Lenses & Heat

6.6.9Exam-Style Questions - EM Radiation

7Magnetism

7.1Magnetism Basics

7.1.1Magnetism

7.1.2Magnetic Materials

7.1.3Induced Magnetism

7.1.4Magnetic Fields

7.1.5Magnetic Field Patterns

7.2Electromagnetism

7.2.1The Magnetic Effect of a Current

7.2.2Solenoid Field

7.2.3Magnetic Field Strength

7.2.4Uses of Electromagnets

7.2.5Motor Effect

7.2.6Direction of Motor Effect

7.2.7Magnetic Flux Equation

7.2.8Magnetic Flux - Calculations

7.2.9Electric Motors

7.2.10Loudspeakers

7.2.11Force Acting on a Coil in a Magnetic Field

7.2.12Induced Potential Difference

7.2.13Increasing the Induced Potential Difference

7.2.14Magnetic Field Direction

7.2.15Forces Between Electricity & Magnets

7.2.16AC/DC

7.2.17AC Generators

7.2.18Generator Effect

7.2.19Microphones

7.3Transformers

7.3.1Transformers

7.3.2Transformer Equation

7.3.3Step-Up & Step-Down Transformers

7.3.4Principles of Transformer Operation

7.3.5High-Voltage Transmission & Transformers

7.3.6Energy in Transformers

7.3.7Power Losses in Cables

7.3.8Transformers - Calculations

7.3.9Transformers 2 - Calculations

7.3.10End of Topic Test - Magnetism

7.3.11Grade 9 - Transformers

7.3.12Exam-Style Questions - Magnetic Fields

8Astrophysics

8.1Astrophysics

8.1.1The Solar System

8.1.2The Sun

8.1.3The Solar System - Calculations

8.1.4Orbits

8.1.5Stable Orbits

8.1.6Orbits HyperLearning

8.1.7Life Cycle of a Star like the Sun

8.1.8Life Cycle of a Star Much Bigger than the Sun

8.1.9Creation of Elements

8.1.10Red-shift

8.1.11The Big Bang Theory

8.1.12Gaps in Knowledge

8.1.13End of Topic Test - Astrophysics

8.1.14Exam-Style Questions - Astrophysics

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