Author Question: A 100-N little physics tyke hangs on the ends of a rope suspended over a pulley as shown. The ... (Read 89 times)

Engineer · **on:** Jul 29, 2018

A 100-N little physics tyke hangs on the ends of a rope suspended over a pulley as shown. The tension in the rope is

1) 0 N.
2) 50 N.
3) 100 N.
4) 200 N.

It is interesting to note that
5) the tension in the rope at its midpoint (uppermost part) is 100 N.
6) this is a modified tug-o'-war example (simply draped over a pulley).
7) the net force acting on the rope is in this case identical to the child's weight.

Question 2

You can exert more force on the pedals of a bicycle if you pull up on the handlebars because

1) your center of gravity can be shifted to a position directly above the pedals,
2) the handlebars, in turn, pull down on you and this force is transmitted to the pedals,
3) rotational inertia is lessened,
4) rotational inertia is increased,

all of which illustrates
5) that equilibrium is center-of-gravity dependent.
6) the law of action and reaction.
7) inertia may be both linear and rotational.