You want to lift a heavy box. The force of gravity pulls it downwards with a force of $500 N$ . Your father applies an upward force of $220 N$ from below. How much force will you have to apply to lift it upwards?

720 N

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280 N

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180 N

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380 N

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Solution

The correct option is B $280 N$
The force of the gravitational pull is 500 N and the additional force of 220 N is applied in the opposite direction.
So, to lift the box, the box has to apply an extra force of 500 N - 220 N = 280 N in order to lift the box against the gravitational pull.
Resultant force is nothing but the total force acting on a body including their directions. Here, the gravitational force acts opposite to the force applied by the father and the boy.
Hence, the boy has to apply a force of 280 N to lift the box.

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You want to lift a heavy box. The force of gravity pulls it downwards with a force of 500N. Your father applies an upward force of 220N from below. How much force will you have to apply to lift it upwards?

You want to lift a heavy box. The force of gravity pulls it downwards with a force of $500 N$ . Your father applies an upward force of $220 N$ from below. How much force will you have to apply to lift it upwards?