Question

4) 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 left. Copy these into your lab notebook and then draw acceleration vectors for the ball on each one 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 (v-0). Explain how you know that 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 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 of the acceleration at B compare to C? Explain. . H

4 and 5

Answer 1

(4) Let's number the figure as shown in the figure,

in figure 2 as the ball is turning around that means acceleration in the figure 1 should be in the right direction as shown in figure attached.

At position 2 also the acceleration should be in the right as in figure 3 the velocity is in right with higher magnitude.

Now, figure 4 has maximum velocity in the right, and figure 5 is with relatively low velocity as compared to figure 4.So at position 4 the acceleration is zero and at position 5 acceleration is apposite to the velocity. Similarly for position 6 the acceleration is as shown in figure and the position 7 is same as the position 1.

(5) Velocity and acceleration as shown in figure attached. Velocity is in the direction tangent to the motion.

Acceleration at B is towards right direction , and acceleration at C is normal to the tangent of the direction of motion. Al so as speed is increasing magnitude of acceleration at C is more than the acceleration at B.