All GCSE physics equations

GCSE Physics Explained

28 Oct 201803:01

EducationalLearning

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TLDRIn this informative video, Mr. Wilby outlines essential physics equations for exams, emphasizing the importance of memorizing them to better understand and apply them in various contexts. The key equations covered include speed, acceleration, force, efficiency, momentum, density, work done, kinetic energy, power, energy transfer, charge, voltage, electrical power, and pressure. This comprehensive guide aims to help students become familiar with these fundamental principles, ensuring they can select the appropriate equations for different problems.

Takeaways

📚 Mr. Wilby is providing a list of essential physics equations for exam preparation.
🔢 The first equation is for speed: Speed = Distance / Time.
🚀 The second equation defines acceleration: Acceleration = Change in Velocity / Time Taken.
⚖️ Newton's second law is introduced with the equation: Force = Mass × Acceleration.
🌍 The equation for gravitational potential energy is given as: Gravitational Potential Energy = Mass × Gravity.
💡 Efficiency is explained with the formula: Efficiency = Useful Energy Transferred / Total Energy Supplied.
🏋️ Momentum is calculated using: Momentum = Mass × Velocity.
🎵 The relationship between speed, frequency, and wavelength is described with: Speed = Frequency × Wavelength.
📏 Density is defined by the formula: Density = Mass / Volume.
🔨 Work done is related to force and distance: Work Done = Force × Distance Moved in the Direction of the Force.
⚡ Electrical concepts are covered, including Ohm's law: Voltage = Current × Resistance.
🔌 Electrical power is discussed in two ways: Power = Work Done / Time Taken and Power = Energy Transferred / Time Taken.

Q & A

What is the formula for calculating speed?
-Speed is calculated using the formula: speed = distance / time.
How do you determine acceleration according to Newton's laws?
-Acceleration is determined by the change in velocity divided by the time taken before the change.
What is Newton's second law of motion?
-Newton's second law of motion states that force equals mass times acceleration (F = ma).
What is the formula for calculating work done?
-Work done is calculated as the force times the distance moved in the direction of the force (W = F × d).
How is kinetic energy defined in physics?
-Kinetic energy is defined as one-half times the mass times the velocity squared (KE = 1/2 × m × v^2).
What is the relationship between power and work done?
-Power is the rate at which work is done, calculated as work done divided by the time taken (P = W/t).
What is the formula for calculating the efficiency of a device?
-Efficiency is the ratio of useful energy transferred by the device to the total energy supplied to the device (Efficiency = Useful energy / Total energy).
How do you calculate the momentum of an object?
-Momentum is calculated as the mass times the velocity of the object (p = m × v).
What is the formula for Ohm's law?
-Ohm's law states that voltage equals current times resistance (V = I × R).
What is the formula for calculating the spring force in Hooke's law?
-In Hooke's law, the spring force is equal to the spring constant times the extension (F = k × x).
How is pressure defined in physics?
-Pressure is defined as the force perpendicular to the surface divided by the area of the surface (P = F/A).

Outlines

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📚 Physics Exam Equations Overview

Mr. Wilby introduces a comprehensive list of essential physics equations for exams. He emphasizes the importance of memorization for familiarity and quick application. The equations cover a range of topics including speed, acceleration, Newton's laws, efficiency, momentum, wave properties, density, work, gravitational potential energy, kinetic energy, power, energy transfer, electrical concepts like Ohm's law, and spring mechanics. This summary serves as a quick reference for students preparing for their physics exams.

Mindmap

Keywords

💡Speed

Speed is a measure of how fast an object is moving and is defined as the distance traveled per unit of time. In the context of the video, it is the first equation introduced, emphasizing its foundational role in physics. The script mentions 'speed equals distance divided by time,' which is a fundamental concept used to calculate the rate at which an object moves from one point to another.

💡Acceleration

Acceleration is the rate of change of velocity of an object with respect to time. It indicates how quickly the velocity of an object changes. The script defines it as 'acceleration equals change in velocity divided by time taken before the change,' highlighting its importance in understanding motion dynamics, especially when the speed of an object is not constant.

💡Force

Force is an interaction that causes a change in the motion of an object. It is a vector quantity that has both magnitude and direction. The script refers to it in the context of Newton's second law, stating 'force equals mass times by acceleration,' which is crucial for understanding how forces impact the motion of objects.

💡Newton's Second Law

Newton's second law of motion is a fundamental principle in physics that relates the force acting on an object to its mass and acceleration. The script mentions this law in the form 'F = ma,' which is essential for solving problems involving the dynamics of moving objects.

💡Efficiency

Efficiency is a measure of how well a device or process performs its intended function, often expressed as a ratio of useful work to total energy input. The script explains it as 'efficiency equals useful energy transferred by the device divided by total energy supplied to the device,' which is key in understanding the performance of various mechanical and energy systems.

💡Momentum

Momentum is the product of an object's mass and its velocity and is a measure of the 'quantity of motion.' It is a vector quantity, having both magnitude and direction. The script states 'momentum equals mass times by velocity,' which is important in understanding the motion and impact of moving objects.

💡Frequency and Wavelength

Frequency and wavelength are related properties of waves. Frequency is the number of wave cycles that pass a point in a given time, while wavelength is the distance between two consecutive points in a wave that are in the same phase. The script mentions 'speed equals frequency times by wavelength,' which is a fundamental relationship in wave physics.

💡Density

Density is a measure of mass per unit volume of a substance. It is an important property that can be used to identify materials and understand their behavior under various conditions. The script defines it as 'density equals mass divided by volume,' which is a key concept in understanding how materials occupy space.

💡Work Done

Work done is the measure of energy transfer that occurs when an object is moved by a force along a displacement. It is a scalar quantity and is important in physics for understanding energy transformations. The script states 'work done equals force times by distance moved in the direction of the force,' which is essential for calculating mechanical work.

💡Gravitational Potential Energy

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. It is dependent on the object's mass, the acceleration due to gravity, and its height above a reference point. The script mentions 'change in gravitational potential energy equals mass times by gravity times by change in vertical height,' which is crucial for analyzing the energy changes in systems under the influence of gravity.

💡Kinetic Energy

Kinetic energy is the energy that an object possesses due to its motion. It is directly proportional to the mass of the object and the square of its velocity. The script defines it as 'kinetic energy equals 1/2 times by mass times velocity squared,' which is fundamental in understanding the energy dynamics of moving objects.

💡Power

Power is the rate at which work is done or energy is transferred over time. It is a scalar quantity and is important for understanding the intensity of energy transfer processes. The script mentions 'power equals work done divided by time taken' and 'power equals energy transferred divided by time taken,' which are key concepts for analyzing the efficiency and speed of energy processes.

💡Electrical Power

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is a measure of how quickly electrical work is done. The script introduces two formulas for calculating electrical power: 'electrical power equals current times by voltage' and 'electrical power equals current squared times by resistance,' which are essential for understanding electrical systems and their performance.

💡Spring Constant

The spring constant is a measure of the stiffness of a spring. It is a proportionality constant that relates the force needed to compress or extend a spring by a certain distance. The script mentions 'spring equals spring constant times by extension,' which is important in Hooke's Law and for understanding the behavior of springs in mechanical systems.

💡Moment of Force

The moment of force, also known as torque, is a measure of the rotational effect of a force about a specific point or axis. It is a vector quantity and is important in mechanics for understanding rotational motion. The script defines it as 'moment equals force times by distance moved perpendicular to the force,' which is crucial for analyzing forces that cause rotation.

💡Pressure

Pressure is the force applied per unit area and is a scalar quantity that indicates the magnitude of force exerted on a surface. It is important in fluid mechanics and materials science. The script states 'pressure equals force perpendicular to the surface divided by area of the surface,' which is essential for understanding how forces are distributed over an area.

Highlights

Speed is defined as distance divided by time.

Acceleration is the change in velocity divided by the time taken before the change.

Newton's second law states that force equals mass times acceleration.

Formulation of gravitational potential energy as mass times gravity.

Efficiency is calculated as useful energy transferred divided by total energy supplied.

Momentum is the product of mass and velocity.

The relationship between speed, frequency, and wavelength in wave physics.

Density is mass divided by volume.

Work done is the product of force and distance moved in the direction of the force.

Change in gravitational potential energy is mass times gravity times change in vertical height.

Kinetic energy is half the product of mass and the square of velocity.

Power is work done divided by the time taken, or energy transferred divided by time taken.

Energy transferred is equal to charge times voltage.

Charge is the product of current and time.

Ohm's law is expressed as voltage equals current times resistance.

Electrical power is the product of current and voltage.

Another form of electrical power is current squared times resistance.

Spring force is the spring constant times extension.

Moment of force is the product of force and the distance moved perpendicular to the force.

Pressure is force perpendicular to the surface divided by the area of the surface.

Transcripts

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