Consider the information given below: Meat (unis)
0
200
400
600
800
1000
Wheat (units)
2000
1800
1500
1100
600
0
a
Draw the production possibility curve. (Put meat on the X-axis.)

The direction a chemical reaction occurs is represented by an arrow 

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on