You want to lift a heavy box. The force of gravity pulls it downwards with a force of 400 N. Your father applies an upward force of 170 N from below. How much force will you have to apply to lift it upwards?
(a) 220 N
(b) 230 N
(c) 300 N
(d) less than 220 N

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Solution

(b) Force of gravity acting in the downward direction = 400 N
Force applied in the upward direction = 170 N
So, net force required to apply to lift the box up = 400 - 170
= 230 N

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Q. 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?
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(d) less than 220 N

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You want to lift a heavy box. The force of gravity pulls it downwards with a force of 400 N. Your father applies an upward force of 170 N from below. How much force will you have to apply to lift it upwards? (a) 220 N (b) 230 N (c) 300 N (d) less than 220 N

(b) Force of gravity acting in the downward direction = 400 N Force applied in the upward direction = 170 N So, net force required to apply to lift the box up = 400 - 170 = 230 N

You want to lift a heavy box. The force of gravity pulls it downwards with a force of 400 N. Your father applies an upward force of 170 N from below. How much force will you have to apply to lift it upwards?
(a) 220 N
(b) 230 N
(c) 300 N
(d) less than 220 N

(b) Force of gravity acting in the downward direction = 400 N
Force applied in the upward direction = 170 N
So, net force required to apply to lift the box up = 400 - 170
= 230 N