A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3m long and the back of the truck is 0.8m above the ground. How much force would be needed to lift a drum into the truck directly, without using the plank? [Take g =10m/s²]

500 N

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600 N

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700 N

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800 N

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900 N

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Solution

The correct option is D
800 N

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A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3m long and the back of the truck is 0.8m above the ground. Assuming that there is no friction between the plank and the drum, calculate i) the MA of the inclined plank, ii) the force needed to push a drum up the plank.

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