You start to pull upwards on a $10 k g$ bag on the floor to lift it up. At the moment when your applied force is $F_{A} = 70 N$ , which answer is closest to the normal force of the floor acting on the bag?

100 N

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70 N

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170 N

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30 N

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Solution

The correct option is D $30 N$
Given : $m = 10$ kg $F_{A} = 70$ N
Let the normal force exerted by the floor on the bag be $R$ .
$∴$ $F_{A} + R = m g$
OR $70 + R = 10 \times 10$ $⟹ R = 30$ N

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You start to pull upwards on a 10kg bag on the floor to lift it up. At the moment when your applied force is FA=70N, which answer is closest to the normal force of the floor acting on the bag?

The correct option is D 30NGiven : m=10 kg FA=70 NLet the normal force exerted by the floor on the bag be R.∴ FA+R=mgOR 70+R=10×10 ⟹R=30 N

You start to pull upwards on a $10 k g$ bag on the floor to lift it up. At the moment when your applied force is $F_{A} = 70 N$ , which answer is closest to the normal force of the floor acting on the bag?

The correct option is D $30 N$
Given : $m = 10$ kg $F_{A} = 70$ N
Let the normal force exerted by the floor on the bag be $R$ .
$∴$ $F_{A} + R = m g$
OR $70 + R = 10 \times 10$ $⟹ R = 30$ N