A boy of mass 40kg is standing in the middle of a park. Questions;
a. Calculate his weight? Use acceleration due to
gravity=9.8m/^2. Direction should be indicated. 2 points
b. Referring to Newton's third law of motion, what does the boy's
weight represent (action or reaction force?)? 1 point
c. What is the boy's acceleration? 2 points
d. How much force is the boy exerting on the earth? Indicate the
direction. 2 points
e. Using the reaction force from d above, calculate the
acceleration of Earth as a result of the boy's weight.
(Estimated mass of earth in kg
5,973,600,000,000,000,000,000,000 kg) 3 points
f. As the boy stands there, he obviously does not feel the earth
moving/accelerating up towards him. Referring to appropriate
Newton's law, Explain why this is the case? 3 points