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  • Friction increases with pressure
  • Friction is the force working against two surfaces rubbing against each other.
  • The amount of friction depends on direction: it may be harder to pet a cat in one direction than another.
  • Friction slows objects down; it is why rolling objects slow down and eventually stop, including rolling cans and roller coasters!
  • A solid cylinder/sphere will always roll down a ramp faster than a hollow cylinder/sphere if both have the same diameter and mass. This is because of inertia.
  • Inertia is an object's resistance to a change in motion. It is harder to spin a cylinder/sphere with all the mass on the outside (Hollow) than it is to spin a cylinder/sphere with the mass spread out throughout the object.
  • We experience inertia every day without realizing it. Want an example? roller coasters use inertia to stay on track!
  • There are two types of kinetic energy for a rolling object: translational (moving in a straight line) and rotational (spinning).
  • Roller coaster loops can't be perfect circles because the pushing force would be too strong for safety and comfort.
  • Inertia is the force that keeps you from falling out of a roller coaster loop.
  • Roller coasters use gravity to gain speed, just like cans rolling down a ramp. (Sorry there are no pictures on this panel, all of the roller coaster pictures require a storyboard that subscription.
  • Roller coasters gain potential energy as they go higher. This potential energy is converted into kinetic energy when going down.
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