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Newton’s First Law

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Newton’s First Law Newton’s First Law of Motion States: an object at rest remains at rest, and an object in motion continues in motion with constant velocity (constant speed in a straight line) unless it experiences a net external force.

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Newton’s Fist Law The net external force is the total force resulting from a combination of external forces on an object.

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Practice Find the net external force: Fnet= 400N up

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Practice Find the net external force Fnet= 200N down

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Practice Find the net external force Fnet= 20N left

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Practice Find the net external force Fnet=0

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**Practice Find the net external force for each A= 50 N B= 200N D= 20 N**

C=1100 N F= x G= 50N H= x

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Practice Joe ponder, from North Carolina, once used his teeth to lift a pumpkin with a mass of 275 kg. Suppose Ponder has a mass of 75 kg, and he stands with each foot on a platform and lifts the pumpkin with an attached rope. If he holds the pumpkin above the ground between the platforms, what is the force exerted on his feet? Fnet= (9.81)(275+75) Fnet= up

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Practice The net force exerted by a woodpecker’s head when it strikes the bark of a tree can be as large as N, assuming that the bird’s head has a mass of 50.0 g. Assume that two different muscles pull the woodpecker’s head forward and downward, exerting a net force of 4.90 N. If the forces exerted by the muscles are at right angles to each other and the muscle that pulls the woodpecker’s head downward exerts a force of 1.70 N, what is the force exerted by the other muscle? Be sure to draw a free-diagram showing the forces acting on the woodpecker’s head. Fnet²=(Fx)² +(Fy)² 4.90N²= Fx² +(1.70N)² Fx= 4.59 N

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Newton’s First Law! An object at rest remains at rest, and an object in motion continues in motion with constant velocity unless the object experiences.

Newton’s First Law! An object at rest remains at rest, and an object in motion continues in motion with constant velocity unless the object experiences.

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