What is the primary function of any lubricant? What will be an ...

[natalie2426]

What is the primary function of any lubricant?
 
  What will be an ideal response?

Question 2

A 500 pound push cart is rolled up an inclined plane that is 20 feet long. The vertical distance the object is raised is 4 feet. Assuming no friction, how much effort will it take to push the cart up the incline?
 
  What will be an ideal response?

Question 3

Give an example of a First, Second, and Third class lever.
 
  What will be an ideal response?

[gabrielle_lawrence]

Answer to Question 1

The primary function of any lubricant is to prevent metal to metal contact of moving surfaces, whether they are sliding or rolling.

Answer to Question 2

Output work = Output force x Output distance
Output work = 500 lb x 4 ft
Output work = 2000 ft-lbs.

With no friction, Input work equals Output work, therefore:

Input force = Input work / Input distance
Input force = 2000 ft-lbs / 20 feet
Input force = 100 lbs force.

Answer to Question 3

Seesaw, wheelbarrow, and man's arm.

[natalie2426]

Thanks for the timely response, appreciate it

[Viet Thy]

Gracias!