Monday, 10/27/14 1)According to your definition of the word wall word “normal”, what is a “normal” force? 2)What is the normal force that the floor exerts.

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Monday, 10/27/14 1)According to your definition of the word wall word “normal”, what is a “normal” force? 2)What is the normal force that the floor exerts on a 50 kg object? Assume the floor is perfectly level.

Word Wall 11) Perpendicular (adj) – meeting at right angles Example: The walls of this room are perpendicular to each other.

Normal Force (notes) Normal Force: The force a surface exerts back on an object Always perpendicular to the surface

Calculating Normal Force For each of the objects listed, calculate the normal force if they were placed on a level surface. a)Small Weight b)Medium Weight c)Large Weight d)A lab stool e)A Physics Book f)A pencil g)A composition book h)A graphing calculator i)A chair (the blue student chairs) j)You

Newton’s Third Law (notes)

Newton’s Third Law Questions and Problems 1) Wilbur asks Mr. Ed, the talking horse, to pull a cart. Mr. Ed replies that he would like to, but the laws of nature just won’t allow it. According to Newton’s 3 rd law, he says, if he pulls on the wagon it pulls back on him with an equal force. Clearly, then, the net force is zero and the wagon will stay put. How should Wilbur answer the clever horse?

Newton’s Third Law Questions and Problems 2) Your small car breaks in the middle of the road. A kindly truck driver agrees to use his large truck to push your car down the road at a constant velocity. Which is greater, the force of the truck on your car, or the force of your car on the truck? Justify your answer. Would your answer change if the truck caused your car to accelerate? Why or why not?

Monday, 10/27/14 (Enrichment) 1) Will your bridge pass? In other words, will it hold a kilogram? Why or why not?