What is an example of a simple machine? a. an electric light b. a small buzzer
c. a car d. a screwdriver

A screwdriver

Explanation:

The devices that are used to enhance of modify the force in order to perform work. Some of the example of simple machines are liver, wheel and axle, etc. A screwdriver is an example of wheel and axle. It consists of two circular and cylindrical objects that rotates about a common axis.

Hence, screwdriver is an example of simple machine.

good for her? ? where is the question?

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.