When the object is pushed, the vertical component of the push increases the normal force. Hence, there is an increase in friction.Now when you pull the object, the vertical component of the pull is in the opposite direction of the normal reaction and hence, reduces it, thereby reducing the friction.Hence, friction in (b) is less than friction in (a) Pulling a body is easier than pushing
QuoteWhen the object is pushed, the vertical component of the push increases the normal force. Hence, there is an increase in friction.Now when you pull the object, the vertical component of the pull is in the opposite direction of the normal reaction and hence, reduces it, thereby reducing the friction.Hence, friction in (b) is less than friction in (a) Pulling a body is easier than pushingThe force one must exert (or machine) is not the same, pushing or pulling, because the forces working against the puller are less, due to the reduction in friction force...
SB, you've riddled around both sides of the argument. So what is your opinion? Is a trolling motor best on the front or back of a boat?
Quote from: "seabob4"QuoteWhen the object is pushed, the vertical component of the push increases the normal force. Hence, there is an increase in friction.Now when you pull the object, the vertical component of the pull is in the opposite direction of the normal reaction and hence, reduces it, thereby reducing the friction.Hence, friction in (b) is less than friction in (a) Pulling a body is easier than pushingThe force one must exert (or machine) is not the same, pushing or pulling, because the forces working against the puller are less, due to the reduction in friction force...That's only true if there is in fact a vertical component. Forces acting in a horizontal, whether pushing or pulling will be the same once they overcome the forces holding the object at rest. Humans can pull easier because the mechanical nature of the motion creates more force on a horizontal direction but the force needed to move the object is the same in either direction.
I haven't seen any dozers that pull dirt either, CB. Sometimes you can just overwhelm the object d'jour with brute strength.
PV=nRTAnyone up for that one?
Quote from: "seabob4"PV=nRTAnyone up for that one?Let me guess.It has something to do with "hot air".