In your physics lab, you are given a hand generator and an assortment of wires with different values of resistance. you connect the leads of the generator across each wire in turn, and in each case attempt to turn the generator handle at the same constant rate. you find that you must push harder on the handle when the leads of the generator are connected

lower resistance.

Explanation:

Here we connect the leads of generator across each wire in turn, and in each case attempt to turn generator handle at the same constant rate. Now , since the generator handle is rotated with the same rate the emf induced will same across each resistance and power generation will be maximum across the lowest resistance.Hence for rotating the handle more power is required. Therefore, we need to push harder on the lower resistance.

chemical properties of thing

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.