Work, Ramps and Levers

See why a ramp and a lever change the force you need without changing the work you do.

7 questions, free, marked as you go with a worked explanation on every one.

What this covers

The block drawn is being pushed to the right at a steady speed. What does that tell you about the two horizontal forces?
A 50 N force pushes a box 4 m along the floor, in the direction of the force. How much work is done on the box?
On the lever drawn, what happens if the fulcrum is moved closer to the load?
On a lever, the effort arm is 1.2 m and the load arm is 0.3 m. What effort is needed to lift a 200 N load?
A ramp rises 1.5 m over a sloping length of 6 m. A 400 N crate is pushed all the way up it. Ignoring friction, how much work is done against gravity?
Which of these are true of using a ramp to raise a load, ignoring friction?
A ball on a string is swung in a horizontal circle at a steady speed. Which way does the net force on it point?