A wheelbarrow has its center of mass located in the center of the load its carri

Question

A wheelbarrow has its center of mass located in the center of the load its carring. The task is to compare two different ways of moving the load; one with force F1                applied by lifting and pushing forward, the other force F2 applied by lifting and pulling the wheelbarrow behind you. The length of the wooden handles is 2 meters,                and the mass of the load plus the wheelbarrow is 80kg. The axle is 30cm from the front end, and F1 is applied 10 cm from the other end of the handles. The handles                make an angle of 30

Explanation / Answer

if all you need to do is compare, then this could be a general case which can be applied to your above said case.

when you pull the wheelbarrow at an angle 'theeta' , the angle it subtends at the centre of mass would be,say 'alpha'<'theeta'. taking the component of the force applied along the centre of masswould give us Fcos('theeta -alpha'). this force would slightly be in the upper direction, since you are pulling.

but when you are pushing, the force applied is slightly downward , thus increasing the friction acting on the body, which results in more force required for the same amount of work done.

this principle when applied to your question gives the particular answer.

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