WQ5.6 3/3 points (graded) A man is standing on a bathroom scale. a) What kind of force is the red force on the man? gravity V b) What kind of force is the orange force on the man? normal V c) The free-body diagram shows that the force of gravity (Fc) and the normal force (n) are equal in magnitude and opposite in direction, but they are not an action/reaction pair. Which of the four rules for interacting force pains are violated and why? n Each member of the action/reaction pair acts on a different object, i.e. the V FG Submit Show answer WQ5.7 2/2 points (graded) A frog sits on an incline plane. a) In which direction is the normal force? perpendicular to plain V b) Explain why the normal force and the weight do not form an action/reaction pair (which rules are broken in this case): Each force is a member of a pair of forces, often called action/reaction, tha v
WQ5.8 3/3 points (graded) Jen and Eric push each other while skating. a) Sketch this picture for yourself on a piece of paper. Show the action/reaction force pair that Jen and Eric exert on each other (Jen on the left and Eric on the right). Label these forces as FJ on E and F Eon J to indicate who exerts the force on whom. (We will use these kind of labels much more on the next weorksheet.) Once you've drawn your forces, type 'yes' below. yes v b) The two skaters are both initially at rest. Then 50 kg-Jen pushes 75 kg-Eric. What happens next? Eric remains at rest; Jen moves away with some speed. Jen remains at rest; Eric moves away with some speed. Both Eric and Jen move away from each other with the same speed. Both Eric and Jen move, but Jen has higher speed. Both Eric and Jen move, but Eric has higher speed. c) Explain your choice. Jen is lighter so higher acceleration V