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Weight (force) goes up, but so does mass (inertia).

Weight (force) goes up, but so does mass (inertia). The two cancel out, so the two skateboards move at the same rate. Weight due to gravity (down) Amount of weight keeping board on ramp Amount of weight making board move down ramp.

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Weight (force) goes up, but so does mass (inertia).

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  1. Weight (force) goes up, but so does mass (inertia). The two cancel out, so the two skateboards move at the same rate.

  2. Weight due to gravity (down) Amount of weight keeping board on ramp Amount of weight making board move down ramp Although weight doesn’t change, the amount making the skateboard move does

  3. Boards hit bottom at same time (Need similar photo with brick)

  4. Rings of the same size move at the same rate Do the shapes matter? In rolling cases, mass doesn’t matter. Shape does. Rods roll faster than rings

  5. Objects with weight far from the rotation axis spin more slowly than ones that are compact.

  6. Things to Remember • Inertia • Moving things stay moving, stationary things stay stationary • All objects moved by gravity accelerate the same • Rotating objects act funny • Some things don’t change and that’s very useful.

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