Question 1: A force F pushes a ball as the ball moves a displacement s. The ball
Answer: it speeds up, since the work done by the force during the displacement, F dot s, is positive
Question 2: A force F pushes a ball as the ball moves a displacement s. The ball
Answer: neither, since vectors F and s are perpendicular: the dot product of F and s is zero.
Question 3: Estimate the work done on the ball due to the force as the ball moves as shown.
Answer: the work done on the ball by the force is work = F dot s = F * s * cos(angle between) The angle between the vectors is about 110 degrees, which is more than 90 degrees -- so the work done will be negative. = something between -15 Joules and 0 Joules
This page maintained by Michael Richmond. Last modified Jan 29, 2002.
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