Friction Details Study Guide

FRICTION DETAILS STUDY GUIDE

Friction- the resistance of an object to movement, also causes changes in kinetic energy.

Conservation of Energy: Energy cannot be created or destroyed, only transferred

• One of the most common energy transformations is Kinetic Energy to Potential Energy
  • Kinetic Energy is energy of motion--which can change an object's position
  • Potential Energy is stored energy, usually due to a change in position/shape
    • Potential Energy gives an object the potential to move (turn back to kinetic energy)

*Roller Coaster Example*

Friction: resistance to movement- Often part of kinetic energy is transformed into heat energy by  Friction

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• Causes kinetic energy to transform to heat energy
  • Like rubbing your hands together: the friction between your hands as they move turns to heat energy and your hands warm up

Think about a child on a slide:

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• The child has potential energy (gravitational) at the top of the slide
• As she slides down, that potential energy transforms to kinetic energy
• Friction with the slide (resisting her sliding) transforms some of the kinetic energy to heat energy
  • Loss of kinetic energy causes the child to slow down

The amount of friction can be changed by:

1. Altering the surface: 

• • Smoother surfaces have less friction
  • Rougher surfaces have more friction

https://www.miniphysics.com/friction.html

2. Adding a lubricant:

• • Water, grease, etc on the surface make it more slippery, so less friction

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3. Changing the mass/weight of the object:

• • More weight means more force holding the object to the surface it's on, which means more friction
  • Less weight means less force pushing down, so less frictionRUBE GOLDBERG MACHINE- is a contraption that uses a chain reaction to carry out a simple task. It performs a very basic job in a complicated way
  • https://www.youtube.com/watch?v=qybUFnY7Y8w   OK Go - This Too shall pass