PHYS 101 Newton’s second law. Example 1 A sled with a mass of 20kg slides along frictionless ice at 4.5 m/s. It then crosses a rough patch of snow that.

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Presentation transcript:

PHYS 101 Newton’s second law

Example 1 A sled with a mass of 20kg slides along frictionless ice at 4.5 m/s. It then crosses a rough patch of snow that exerts a friction force of f = 12 N (kinetic or static?). How far does the sled slide before it comes to rest?

Example 2 Students help you move into you dorm and push your boxes up a 20° slope with a horizontal force. How hard do they have to push to get the box moving? Could they make their lives a bit easier?

mass vs. weight Moon Olympics note: John Young’s weight is still stated as 300 pounds …