Podcast
Questions and Answers
What is the main difference between mass and weight?
What is the main difference between mass and weight?
- Mass is constant regardless of location, while weight varies with gravitational force. (correct)
- Mass is the amount of force an object has, while weight is the total number of particles.
- Mass changes based on gravity, but weight does not.
- Weight is always greater than mass in every environment.
Which of the following statements about contact and at-a-distance forces is true?
Which of the following statements about contact and at-a-distance forces is true?
- Contact forces can act on objects without any physical interaction.
- At-a-distance forces require the objects to be in close proximity.
- Contact forces involve direct physical interaction with the object. (correct)
- Gravity is an example of a contact force.
What does the formula W = FD represent?
What does the formula W = FD represent?
- The total energy used by an object in motion.
- The calculation of mass based on weight and gravity.
- The measure of mechanical advantage in machines.
- The relationship between work, force, and distance in joules. (correct)
If a bike inputs a force of 150N and outputs a force of 350N, what is the mechanical advantage?
If a bike inputs a force of 150N and outputs a force of 350N, what is the mechanical advantage?
What will happen to an object's weight if it is taken from Earth to the Moon?
What will happen to an object's weight if it is taken from Earth to the Moon?
Flashcards
Contact Force
Contact Force
A force that requires touch to push or pull objects.
At-a-Distance Force
At-a-Distance Force
A force that can act on objects without physical contact.
Mass
Mass
The amount of matter in an object that does not change.
Work
Work
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Mechanical Advantage (MA)
Mechanical Advantage (MA)
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Study Notes
Force Categories
- Contact Force: Requires physical touch to exert a push or pull. Example: hitting a hockey puck with a stick.
- At-a-Distance Force: Can influence objects without direct contact. Gravity is an example. Example: an apple falling due to gravity.
Mass and Weight
- Mass: The measure of an object’s matter. It remains constant regardless of location. It is not affected by gravity.
- Weight: The gravitational force acting on mass. It varies based on the strength of the gravitational field. Example: weight differs on Earth and the Moon.
Work and Energy
- Work: The effort required to move an object due to an applied force. Calculated using the formula: Work (joules) = Force (Newtons) × Distance (meters). Example: moving a box 3 meters with a 200N force requires 600 Joules of work.
Output vs Input
- Output: The force a machine exerts on an object.
- Input: The force applied to the machine itself.
- Mechanical Advantage (MA): Calculated by dividing output force by input force. Example: if a bike's output force is 350N and input force is 150N, the mechanical advantage is 2.
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