Podcast
Questions and Answers
What type of force requires physical contact to act on an object?
What type of force requires physical contact to act on an object?
- Friction
- Gravity
- At-a-Distance Force
- Contact Force (correct)
The weight of an object changes depending on its mass and the gravitational force acting on it.
The weight of an object changes depending on its mass and the gravitational force acting on it.
True (A)
What is the formula used to calculate work?
What is the formula used to calculate work?
W = F × D
The gravitational force on Earth is approximately _N/kg.
The gravitational force on Earth is approximately _N/kg.
Match the following terms with their definitions:
Match the following terms with their definitions:
Flashcards
Contact Force
Contact Force
A force that requires physical contact with an object to push or pull it.
At-a-Distance Force
At-a-Distance Force
A force that can act on objects without physical contact, such as gravity.
Mass vs Weight
Mass vs Weight
Mass is the amount of matter in an object, while weight is the force of gravity on that mass.
Work
Work
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Mechanical Advantage (MA)
Mechanical Advantage (MA)
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Study Notes
Force Categories
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Contact Force: Forces that require physical touch to act on an object. Example: Hitting a hockey puck with a stick.
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At-a-Distance Force: Forces that can act on an object without physical contact. Example: Gravity pulling an apple down.
Mass and Weight
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Mass: The amount of matter in an object. Mass does not change regardless of location.
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Weight: The force of gravity acting on an object. Weight changes based on the gravitational pull of a location. A mass of 10 kg on Earth weighs 98 Newtons.
Work and Energy
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Work: The effort (or energy) used when a force moves an object. Calculated as Work = Force × Distance. Example: Moving a box 3 meters with a force of 200 Newtons requires 600 Joules of work.
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Energy: The ability to do work. Performing work expends energy.
Output vs. Input
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Output: The force exerted by a machine on an object.
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Input: The force exerted on a machine.
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Ideal Mechanical Advantage (MA): The MA calculated without considering friction's energy loss. Calculated as MA = Output Force / Input Force
Calculating Newtons (N)
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Newton's per kilogram (N/kg) on Earth: 9.8 N/kg.
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Calculating Weight in Newtons: Weight (Fg) = mass (m) × acceleration due to gravity (g). Formula is Fg = m × g.
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