Podcast
Questions and Answers
What is the formula for calculating work done when a force is applied at an angle?
What is the formula for calculating work done when a force is applied at an angle?
- Work = F x d x sinθ
- Work = F x d / cosθ
- Work = F x d
- Work = F x d x cosθ (correct)
Which unit is the standard unit of work in the International System of Units (S.I.)?
Which unit is the standard unit of work in the International System of Units (S.I.)?
- Pascal
- Watt
- Joule (correct)
- Newton
If a force of 50N is applied to move an object through a distance of 10m, what is the work done?
If a force of 50N is applied to move an object through a distance of 10m, what is the work done?
- 200 Joules
- 5 Joules
- 500 Joules (correct)
- 50 Joules
What does the equation W = Fd represent in the context of work?
What does the equation W = Fd represent in the context of work?
When lifting an object to a height h, which formula is used to calculate the work done against gravity?
When lifting an object to a height h, which formula is used to calculate the work done against gravity?
How is work done defined when an object does not move, even if a force is applied?
How is work done defined when an object does not move, even if a force is applied?
In calculating work done, if the displacement is perpendicular to the force applied, what is the work done?
In calculating work done, if the displacement is perpendicular to the force applied, what is the work done?
If a boy with a mass of 80kg runs up a staircase 30 steps high, how is the work done calculated?
If a boy with a mass of 80kg runs up a staircase 30 steps high, how is the work done calculated?
What is the formula for calculating work done?
What is the formula for calculating work done?
Which type of energy is stored in chemicals and can be converted to heat?
Which type of energy is stored in chemicals and can be converted to heat?
What is the potential energy of a 30 kg object lifted to a height of 5 m, given that g = 10 m/s²?
What is the potential energy of a 30 kg object lifted to a height of 5 m, given that g = 10 m/s²?
What energy is described as the energy possessed by a body due to its motion?
What energy is described as the energy possessed by a body due to its motion?
How is gravitational potential energy defined?
How is gravitational potential energy defined?
If an object has a mass of 15 kg and a gravitational potential energy of 55 Joules, what is its height?
If an object has a mass of 15 kg and a gravitational potential energy of 55 Joules, what is its height?
Which of the following is NOT a form of energy listed in the content?
Which of the following is NOT a form of energy listed in the content?
What is the distance component in the work done formula when given an angle?
What is the distance component in the work done formula when given an angle?
Flashcards
Work done
Work done
The product of force and distance moved in the direction of the force.
Energy
Energy
The ability to do work.
Potential Energy
Potential Energy
Energy stored due to an object's position.
Gravitational Potential Energy
Gravitational Potential Energy
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Kinetic Energy
Kinetic Energy
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Joules (J)
Joules (J)
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Chemical Energy
Chemical Energy
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Mechanical Energy
Mechanical Energy
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Work (Physics)
Work (Physics)
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Work Formula
Work Formula
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Work Units
Work Units
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Work and Inclined Force
Work and Inclined Force
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Work and Gravity
Work and Gravity
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Force
Force
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Calculate Work, given Force and Distance
Calculate Work, given Force and Distance
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Calculate Work, given mass g & height
Calculate Work, given mass g & height
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Study Notes
Work, Energy, and Power
- Work: Applied force over a distance.
- For work to be done, a force must move an object through a distance in the direction of the force.
- Work is calculated as force multiplied by distance (in the direction of the force).
- The formula for work is: Work = Force × Distance
- The SI unit for work is the joule (J), or Newton-metre (Nm).
- Force: Force is mass multiplied by acceleration.
- Force = mass × acceleration
- Work can also be expressed using the force, mass, acceleration and displacement.
- Work done= mass × acceleration × displacement
Different Types of Energy
- Energy: The ability to do work. It's a scalar quantity measured in joules (J).
- Chemical Energy: Energy stored in chemicals, often used as food, or in chemical reactions (e.g. light given off).
- Mechanical Energy: Energy due to position or motion.
- Nuclear Energy: Energy from the nucleus of atoms.
- Sound Energy: Vibrations of air particles.
- Hydro Energy: Energy from water at a height.
- Solar Energy: Energy from the sun.
Potential Energy
- Potential Energy: Energy stored in an object due to its position or configuration.
- Gravitational potential energy (PE) is the potential energy of an object due to its height.
- The formula for gravitational potential energy is: PE = mgh
- m = mass in kilograms
- g = acceleration due to gravity (approximately 10 m/s²)
- h = height in meters
Kinetic Energy
- Kinetic Energy: Energy stored in an object due to its motion.
- The formula for kinetic energy is: KE = 1/2 × mv²
- m = mass in kilograms
- v = velocity in meters per second.
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