Exercises 18 show two of the three forces acting on an object in equilibrium. Redraw the diagram, showing all three forces. Label the third force .
The net force of should be acting on the object such that the object is at equilibrium.
From the given diagram, one can observe that .
The net force acting on the given diagram is
F=F1 + F2
Since both the forces are in opposite directions, the net force will be reduced and acting along F1.
It can be seen from the below force diagram:
Since the net force is along F1, the third force F3 should act in such a direction to nullify the net force F.
Therefore, the F3 must be acting along F2 as shown in the below force diagram:
If a car stops suddenly, you feel “thrown forward.” We’d like to understand what happens to the passengers as a car stops. Imagine yourself sitting on a very slippery bench inside a car. This bench has no friction, no seat back, and there’s nothing for you to hold onto. a. Draw a picture and identify all of the forces acting on you as the car travels at a perfectly steady speed on level ground. b. Draw your free-body diagram. Is there a net force on you? If so, in which direction? c. Repeat parts a and b with the car slowing down. d. Describe what happens to you as the car slows down. e. Use Newton’s laws to explain why you seem to be “thrown forward” as the car stops. Is there really a force pushing you forward? f. Suppose now that the bench is not slippery. As the car slows down, you stay on the bench and don’t slide off. What force is responsible for your deceleration? In which direction does this force point? Include a free-body diagram as part of your answer.
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