Question

The diagrams below show a ball swinging on a string. The diagrams show the ball's position at equal time intervals, The first position is when the ball is moving up and leit Copy these into your lab notebook and then draw acceleration vectors for the ball on each one. You will need your answers to 6) of Part C to do this, Explain how you know that the acceleration points the way you drew it for each diagram. The arrows show the ball's relative speed and direction at each instant and turnaround points have no arrow tve) 4) 5) In the diagram below, a car travels around a curved track. The car starts at rest at point A and speeds up uniformly until just before it reaches point D. It travels at a constant speed until just beyond E and then slows down uniformly to come to rest at H. Copy this diagram into your lab book. See Part C of the lab for help. Draw an arrow to represent the car's velocity at each of the labeled points. Draw the lengths of the vectors to represent the car's speed at each point. . On the same diagram, draw arrows to represent the car's acceleration at each labeled point. Remember that the acceleration vector tells you how the car's velocity (not its speed) is changing in the vicinity of the point. . How does the magnitude H of the acceleration at B compare to C? Explain.

4 and 5. Part C question 6 is not relevant to question 4 and 5 despite what the question says.

Answer 1

4) Neglecting air resistance, the only force acting on the ball is the gravity of the Earth, which is always towards the ground. Since the ball is constrained by a string, the acceleration the ball experience will be different. The acceleration will always be to the central equilibrium, ie to the position 4 given in the question( neglecting the arrow representing the speed). So the acceleration will always point to the center. so all the positions to the left of the equilibrium position will have acceleration vector pointing right, towards the center and all positions to the right will have acceleration vector pointing left.

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