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FORCES AT AN ANGLE Tightening the loose ends Physics 11-3-14.

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Presentation on theme: "FORCES AT AN ANGLE Tightening the loose ends Physics 11-3-14."— Presentation transcript:

1 FORCES AT AN ANGLE Tightening the loose ends Physics

2 TODAY’S GOAL – REMEDIATE ISSUES FROM QUIZ  Today –  Go over quiz as a class  In table groups (i.e. new groups), work through guided practice on the whiteboard for the items we had trouble with.

3 GO OVER QUIZ AS A CLASS

4 CONCEPTS WE DID WELL ON  Vector terminology (6-9)  Resolving a vector into x and y components (1)  Adding vectors using the Pythagorean theorem (2,10)  Relative velocity (10)

5 CONCEPTS WE NEED TO PRACTICE  Determining when to use  F net =ma vs  F net =sum of all the forces acting in that plane  Specific problem types  Applied forces at an angle, horizontal surface (3)  Forces on an incline (5)  Tension at an angle (4)

6 HOW DO YOU KNOW WHICH EQUATION TO USE?

7 FORCES AT AN ANGLE EXAMPLE  An object in equilibrium has three forces exerted on it. A 33.0N force acts at 90.0 degrees from the x-axis and a 44.0N force acts at 60.0 degrees from the x-axis. What are the magnitude and direction of the third force? 74.4N, 253 degrees

8 FORCES ON AN INCLINE EXAMPLE  If the coefficient of kinetic friction between the ground a boulder and the mountainside is 0.40, the mass of the boulder is 20 kg, and the slope of the mountain is a constant 30 degrees, what is the force that a person must apply to the boulder to move it up the mountain at constant velocity? 166N

9 TENSION AT AN ANGLE  Joe wishes to hang a sign weighing 750 N so that cable A, attached to the store, makes a 30.0 degree angle. Cable B is horizontal and attached to an adjoining building. What is the tension in cable B? 435N, right

10 PROBLEM SET PRACTICE - FORCES


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