Transcript Force, Motion & Energy

Force, Motion & Energy:
Newton’s 3 Laws
B. Davis & L. Blackburn
Mathematics & Science Center
Mass vs Weight
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Mass = measure of inertia
(resistance to change in motion)
Weight = force
(caused by gravity, affected by
both planet size and mass of
body)
Mass vs Weight
• Weight in pounds
• Mass in kilograms
• Mass in slugs
• Weight in Newtons
Newton’s 3 Laws
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Sir Isaac Newton
Late 1600’s England
Legend of Apple
Invented Calculus
Prism and Light
Universal Law of
Gravity
Phot from http://www-groups.dcs.stand.ac.uk/~history/Mathematicians/Newton.ht
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Law: Law of Inertia
• A body at rest will remain at
rest
• And
• A body in motion will remain in
motion
• Unless…
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Law: Law of Inertia
• A body at rest will remain at
rest
• And
• A body in motion will remain in
motion
• Unless…
• Acted upon by an outside force
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Law: Law of Inertia
• Keep on keeping on
Truck and Ladder Example
Buckling Up Example
Coin Flick Example
Egg Test
Hammer example
2nd Law:
Law of Acceleration
• The acceleration of a body is:
• Directly proportional to force
• Inversely proportional to mass
Remember: acceleration is
change in speed
2nd Law:
Law of Acceleration
2nd Law:
Law of Acceleration
2nd Law:
Law of Acceleration
Rhino example
Weight on other Planets
• Weigh in
3rd Law:
Law of Reaction
•For every force on one body,
•There is an equal
• but opposite force
• on another body.
3rd Law:
Law of Reaction
•For every action,
•There is an equal but
opposite reaction.
3rd Law:
Law of Reaction
•Forces always
•Come in pairs
•Equal in size
•Opposite in direction
•Acting on 2 different bodies
3rd Law:
Law of Reaction
3rd Law:
Law of Reaction
Pitched ball example
May the FORCE be with you !