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19. # Forces (F=ma)

23. ### Basic Force Problems (F=ma): F=ma, net force, gravity on the moon

24. #### The videos in this chapter cover word problems about elevators, specifically the ones where they tell you how fast the elevator is accelerating up or down and then ask you how much the scale under the passenger would say the person weighs. Examples covered:   25. #### The videos in this chapter cover problems where a mass on a string is being swung around in a circle. Could be a yo-yo, getting whipped in a vertical circle or a horizontal circle around someone's head. Could be a mass on a frictionless table with a weight on the string in a hole in the middle of the table. In each problem, you'll be asked to calculate either the velocity or radius of the circle which would: cause the string to go slack, break the string, or achieve equilibrium. Examples covered:   26. #### These videos cover lots of examples of centripetal force problems where the object going in a circle is a vehicle. In the case of roller coasters and jets (and some car problems), the circle is usually vertical and you're being asked to find the speed at which the person in the vehicle is "weightless" at the top of the loop (i.e. normal force is zero). In other car problems, the circle is horizontal (a curve in the road), and you're being asked how high to bank the turn or what coefficient of friction would prevent the car from sliding off the road. Examples covered:       