Download - 0708 laws of_motion leks
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WELCOME
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Newton’s First Law(law of inertia)
An object at rest tends to stay at rest and an object in motion tends to stay
in motion unless acted upon by an unbalanced force.
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Balanced Force
Equal forces in opposite directions produce no motion
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Unbalanced Forces
Unequal opposing forces produce an unbalanced force
causing motion
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Newton’s First Law (law of inertia)
• MASS is the measure of the amount of matter in an object.
• It is measured in Kilograms
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1st Law
• Unless acted upon by an unbalanced force, this golf ball would sit on the tee forever.
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• There are four main types of friction:– Sliding friction: ice skating– Rolling friction: bowling– Fluid friction (air or liquid): air or water resistance– Static friction: initial friction when moving an object
What is this unbalanced force that What is this unbalanced force that acts on an object in motion?acts on an object in motion?
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1st Law
• Once airborne, unless acted on by an unbalanced force (gravity and air – fluid friction) it would never stop!
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Inertia
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Terminal Velocity
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Newton’s Second Law
Force equals mass times acceleration.
F = ma
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Newton’s Second Law• Force = Mass x Acceleration
• Force is measured in NewtonsACCELERATION of GRAVITY(Earth) = 9.8 m/s2
• Weight (force) = mass x gravity (Earth)
Moon’s gravity is 1/6 of the Earth’sIf you weigh 420 Newtons on earth, what will you weigh on the Moon?
70 NewtonsIf your mass is 41.5Kg on Earth what is your mass on the Moon?
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Newton’s Second Law
• WEIGHT is a measure of the force of ________ on the mass of an object
• measured in __________
gravity
Newtons
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Newton’s Second Law
One rock weighs 5 Newtons.The other rock weighs 0.5 Newtons. How much more force will be required to accelerate the first rockat the same rate as thesecond rock?
Ten times as much
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THANK YOU