A gardener mows a lawn with an old-fashioned pushmower. The handle of the mower makes an angle of 35° withthe surface of the lawn. (a) If a 219-N force is applied along thehandle of the 19-kg mower, what is the normal force exerted bythe lawn on the mower? (b) If the angle between the surface ofthe lawn and the handle of the mower is increased, does thenormal force exerted by the lawn increase, decrease, or stay thesame? Graph and Explain.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!