1. The figure below shows the forces exerted on a block that is sliding to the right on a horizontal surface: the gravitational force of 40 N, the 40 N normal force exerted by the
surface, and a frictional force exerted to the left. The coefficient of friction between the
block and the surface is 0.20.
40 N
40 N
The acceleration of the block is most nearly
a. 1 m/s? to the right
b. 2 m/s to the right
C. 1 m/s? to the left
d. 2 m/s? to the left

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

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