Forces and Motion. Main Injector, 2 miles around Tevatron, 4 miles around Fermilab.
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Transcript of Forces and Motion. Main Injector, 2 miles around Tevatron, 4 miles around Fermilab.
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Forces and Motion
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Main Injector,2 miles around
Tevatron,4 miles around
Fermilab
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Physics explains things that are very, very large.
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Physics explains
things that are very,
very small.
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Physics explains things that are right in front of us.
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Newton’s First Law• Objects at rest remain at rest
• Objects in motion remain in motion
UNTIL YOU APPLY A FORCE
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Objects tend to resist a change
in motion. This is called:
Inertia
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Newton’s Second Law
F = ma
What is a force?
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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
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Boards hit bottom at same time
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Weight (force) goes up, but sodoes mass (inertia).
The two cancel out, so the twoskateboards move at the samerate.
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What do we expect to see with rings of the same size ?
Rods roll faster than rings
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Rings of the same size move at the same rate
Rods roll faster than rings
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Do the shapes matter?
Rods roll faster than rings
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Rods roll faster than rings
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Rings of the same size move at the same rate
Rods roll faster than rings
In rolling cases, mass doesn’t matter.Shape does.
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Newton’s Third Law
For every action there is an equal and opposite reaction.
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Conservation of Momentum
If m1 = m2 , then v1 = v2
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Conservation of Energy
Potential Energy
Kinetic EnergyKinetic Energy
Compression Energy
Heat and Sound Energy
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Spins in Figure Skating
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Objects with weight far from the rotation axis spin more slowly than ones that are compact.
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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.