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Outline

Outline. Newton’s Third Law + Review. Newton’s Third Law Examples Review Quiz. NIII definition. Newton’s 3rd Law. “If object A exerts a force on object B, then object B exerts a force equal in magnitude and opposite in direction on A”. Action  Reaction. The Math.

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Outline

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  1. Outline Newton’s Third Law + Review • Newton’s Third Law Examples • Review • Quiz

  2. NIII definition Newton’s 3rd Law “If object A exerts a force on object B, then object B exerts a force equal in magnitude and opposite in direction on A” Action  Reaction

  3. The Math FA on B = - FB on A B Fapp A

  4. B Fapp A Example: Two blocks are pushed with an applied force. Determine the acceleration of the blocs and the action/reaction forces FAB and FBA.

  5. Review

  6. Walk–Back/Forth Draw the v-t and a-t graphs for the x-t graph x [m] t [s]

  7. QQ29: 2-D Components Exercise Determine the numerical values of the x and y components of each vector: y y 120 5 x x 45 10 Ax = __________ Ay = __________ Bx = __________ By = __________ What would A+B look like ?

  8. normal force : is perpendicular to the surfaces in contact • friction : is parallel to the surface We divide the contactforce into two components”

  9. Demo Ex: Two blocks are connected over a frictionless pulley. What is the acceleration of the system given no friction. m1=2kg m2=1kg

  10. Demo Ex: A block is moving down a ramp that makes an angle θ with the horizontal. What is the acceleration of the system given that there is friction. m1 θ

  11. QQ38: Inequality Example: A horizontal force of 150 N is applied to a 50 kg box on a level floor. The coefficient of static friction between the box and the floor is 0.5. What magnitude of the frictional force on the box.

  12. What to review • look over all the lecture notes • write down ‘key concepts’ that you think are important • be able to use x-t, v-t, a-t graphs • understand normal forces (ramps, level) • be able to find acceleration for simple systems • free body diagrams • look over projectile motion • don’t worry about any long derivations we did in class!

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