the force is applied to pulling against gravity and getting the coin to the desired height. The direction of the force you use is the same direction you want the coin to travel which means the distance the coin travels is equal to the height you want the coin off the table (Giancoli, 1991). In the second experiment, when you pull the coin across an angled book with a smooth surface it takes less force to move compared to the first experiment. The surface of the book is supporting the weight of the coin compared to when the coin is hanging freely off the table.
This means you need less force to pull the coin because there is no need to fight as hard against the pull of gravity. (Giancoli, 1991). However, if you pull the coin a distance of 10 cm across the book, when you measure the vertical height of the coin from the tabletop it is less than 10cm. This means, unlike our first experiment, the distance is not equal to the height we want to travel. To get the coin to a 10cm vertical height off the table you must pull the coin a longer distance across the book to get the height you want.
This shows it takes less force to pull the coin but it takes a longer distance to get the height that you want off the tabletop (Giancoli, 1991). As we said before the work is equal the force you use multiplied by the distance it travels. If we change the angle of the book higher from the table it means more force is needed to pull the coin because it supports less of the coin’s weight. Since the edge of the book is closer to the desired vertical height off the table it needs to travel less distance.
When we pull with increased force across a decreased distance the work equals the same no matter what angle the coin travels as long as we get to our 10cm height. Conclusion After performing both experiments we find that the work done is the same for both. The work done depends only on the vertical height we want to achieve and not the angle it travels to get there (Giancoli, 1991). References Giancoli, G. C. (1991) Physics, third edition. New Jersey: Prentice Hall Webster (1987) Webster`s Dictionary, New York, Atlantic Book PublishingSample Essay of Paperial.com