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6 Cards in this Set
- Front
- Back
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Newton's First Law
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A body in uniform motion remains in uniform motion, and a body at rest remains at rest, unless acted on by a nonzero net force.
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Newton's Second Law
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The rate at which a body's momentum changes is equal to the net force acting on the body:
F(net) = dp/dt p = momentum F = ma (N2L, constant mass) |
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Newton's Third Law
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If object A exerts a force on object B, then object B exerts an oppositely directed force of equal magnitude on A.
-- forces come in pairs |
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Different types of forces
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1) tension forces: when objects are suspended from ropes or cables--the ropes stretch until the force they exert balances the force of gravity
2) contact forces: the force is exerted through direct contact 3) action-at-a-distance: forces that seemingly act between distant objects (examples are gravity, electric and magnetic forces) |
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Springs
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convenient for measuring devices, stretching or compressing in response to an applied force
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Hooke's Law
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F(sp) = -kx
k is the spring constant, with units of N/m |
