1. How do machines make work easier?

Question

2. How do you calculate work (what is the formula for work?)

3. What is the formula for mechanical advantage?

4. How does friction impact work?

Answer 1

1. Machines make you do one of three things:
- Change direction
- Change the amount of force
- Change the amount of distance
They help change these things to your needs, so you won't do everything yourself!
2. work = force x distance
3. mechanical advantage = output force/input force
4. Friction makes it harder to do work. It acts against your force a small bit, and converts some work into heat rather than movement. But don't forget that we need friction for many things, such as driving a screw into a wall, or walking!

Answer 2

I hope I wasn't too late for some, I know this was posted a year ago...