Motion on a plane with some friction.

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Presentation transcript:

Motion on a plane with some friction. Up Down Acceleration Motion on a plane with some friction.

A box is sliding up an inclined rough plane (some friction acts) A box is sliding up an inclined rough plane (some friction acts). Draw a force diagram for the box while sliding upwards (after a brief push). velocity

A box is sliding up an inclined rough plane (some friction acts) A box is sliding up an inclined rough plane (some friction acts). Draw a force diagram for the box while sliding upwards (after a brief push). velocity Normal Force f mg

A box is sliding up (after a brief push) an inclined rough plane (incline angle 25 degrees). The box has mass M = 10kg. Friction f = 30N. Calculate the magnitude and direction of the acceleration of the box. x y velocity Normal Force wx f wy q

Moving Up Rough Incline

A box sliding down an inclined rough plane (incline angle 25 degrees) A box sliding down an inclined rough plane (incline angle 25 degrees). The box has mass M = 10kg. Friction f = 30N. Calculate the magnitude and direction of the acceleration of the box. x y velocity Normal Force f wx wy q

Moving Down Rough Incline

Difference in Accelerations

Real Data: Cypress 9/7/10 Track angle: 5 degrees Representative data: a(up) = 0.8743 m/s/s a(down) = 0.8232 m/s/s Average difference in acceleration: 0.0549 m/s/s