Podcast
Questions and Answers
In physics, what is 'work' closely related to?
In physics, what is 'work' closely related to?
- The weight of an object
- The color of an object
- The amount of time spent on an activity
- The force applied over a distance (correct)
Which of the following describes a scenario where work is being done?
Which of the following describes a scenario where work is being done?
- Pushing a car that doesn't move
- Holding a heavy box stationary
- Lifting a barbell off the ground (correct)
- Sitting in a chair
If you push against a wall with 50 Newtons of force and the wall doesn't move, how much work have you done?
If you push against a wall with 50 Newtons of force and the wall doesn't move, how much work have you done?
- More than 50 Joules
- 0 Joules (correct)
- 50 Joules
- Less than 50 Joules
What is the standard unit of measurement for work?
What is the standard unit of measurement for work?
What is the mathematical relationship for calculating work when the force and displacement are in the same direction?
What is the mathematical relationship for calculating work when the force and displacement are in the same direction?
What type of quantity is work?
What type of quantity is work?
In the context of physics, what is energy?
In the context of physics, what is energy?
What unit is used to measure energy?
What unit is used to measure energy?
What is energy that is associated with motion called?
What is energy that is associated with motion called?
What is energy that is associated with the position or condition called?
What is energy that is associated with the position or condition called?
Which of the following is an example of kinetic energy?
Which of the following is an example of kinetic energy?
Which of the following is an example of potential energy?
Which of the following is an example of potential energy?
What does the Work-Energy Theorem state?
What does the Work-Energy Theorem state?
If a force does positive work on an object, what happens to the object's kinetic energy?
If a force does positive work on an object, what happens to the object's kinetic energy?
What is power defined as?
What is power defined as?
What is the formula for power?
What is the formula for power?
How many watts are in a kilowatt?
How many watts are in a kilowatt?
If a machine does 1000 Joules of work in 10 seconds, what is its power output?
If a machine does 1000 Joules of work in 10 seconds, what is its power output?
What does it mean to say that 'work' is done on an object?
What does it mean to say that 'work' is done on an object?
What does it mean if an object has 'energy'?
What does it mean if an object has 'energy'?
What is "Energy Consumption" measured in?
What is "Energy Consumption" measured in?
What is the equation to determine power?
What is the equation to determine power?
What is the name of the eighteenth-century developer of the steam engine where the unit "watt" was named in honor of?
What is the name of the eighteenth-century developer of the steam engine where the unit "watt" was named in honor of?
How many watts is equivalent to one megawatt?
How many watts is equivalent to one megawatt?
Which one the following is the formula for Force?
Which one the following is the formula for Force?
Which of the following is an example of doing work?
Which of the following is an example of doing work?
What is the measure of cost from the consumption of Energy?
What is the measure of cost from the consumption of Energy?
What is the formula of work with angle?
What is the formula of work with angle?
What is the formula for kinetic energy?
What is the formula for kinetic energy?
What is the formula for potential energy?
What is the formula for potential energy?
What is the definition of energy consumption?
What is the definition of energy consumption?
What is the work-energy theorem?
What is the work-energy theorem?
Flashcards
What is work?
What is work?
Work is done on an object when a force causes a displacement of the object.
Work formula
Work formula
W = Fd cos(θ), where W is work, F is the force, d is displacement, and θ is the angle between force and displacement.
What is a watt?
What is a watt?
The unit of power is the joule per second, named the watt (W) in honor of James Watt.
What is 1 watt equal to?
What is 1 watt equal to?
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Kinetic Energy
Kinetic Energy
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Potential Energy
Potential Energy
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Study Notes
- Work, energy, and power are physics concepts that define relationships
What is work?
- The formula for work is W = Fd cos(o), where:
- W equals work
- F equals force
- d equals displacement
- o equals the angle between force and displacement; 0 if force direction mirrors displacement
- Work is a scalar quantity
Power Defined
- The unit of power is the joule per second, also known as the watt
- This unit is named to commemorate James Watt, the 18th-century steam engine developer
- One watt (W) of power goes into doing 1 joule of work within 1 second
- One kilowatt (kW) equals 1000 watts
- One megawatt (MW) equals 1 million watts
Work-Energy Theorem
- Relates the work done to the change in kinetic energy
Energy
- Stored energy
- Doing Work
- Kinetic Energy
- Potential Energy
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