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Forces and Newton’s Laws
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Galileo
• 1st to state that forces are not necessary to keep things moving
• In the absence of friction, things will continue to move if already moving and stay at rest if already at rest
• Every material has a resistance to a change in its state of motion - INERTIA
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An inertia example
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Newton’s 1st law. (The law of Inertia)
• Every body continues in its state of rest, or of constant motion in a straight line at a constant speed, unless it is compelled to change that state by an unbalanced FORCE
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Demonstrations
I HOOP IT WORKS?
HOW’S IT HANGING?
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Question.
• Would it be correct to say that the reason an object resists change, and persists in its state of motion is because of inertia?
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Bad Inertia
•Jumping to Breinigsville•Helicoptering to
California
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A painful inertia example
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Fact• If an astronaut is in space for any
extended period of time, it is extremely important that He or She does not lose mass. How can an astronaut measure his or her mass while in a “weightless” environment?
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An objects inertia is measured by its MASS
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Mass VS Weight
• Mass• Amount of matter in
an object• Does not depend on
location
• Weight• The gravitational
force that acts on an object
• Depends on location
Mass and weight are not the same, but are proportional to each other in
any one location
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…unless it is compelled to change that state by anUNBALANCED FORCE