An oil drum of weight 75kgf can be placed in a truck directly or by pushing it up along a wooden plank 3m long, such that height of the floor of truck is 0.80 m above the ground level.
1. How much effort is required to life the oil drum directly upward?
2. How much is (a) mechanical advantage of inclined plane made by the wooden plank (b) effort needed to push up oil drum?
3. If the actual effort needed to push up the oil drum along inclined is 350N, what is the force of friction offered by the wooden plank?
