Question

Why is it harder to lift a 100-pound sack of rice than to lift a 5-pound bag of sugar?

Answer 1

It is harder to lift a 100-pound sack of rice than to lift a 5-pound bag of sugar because the 100-pound sack has a greater mass and weight. According to Newton's second law of motion, the force required to move an object is directly proportional to its mass and acceleration. Therefore, the heavier sack of rice requires more force to lift.

Step-by-step explanation:

The reason it is harder to lift a 100-pound sack of rice than to lift a 5-pound bag of sugar is because of the difference in their weights. When you lift an object, you are exerting a force against the force of gravity acting on it, which we refer to as the object's weight. The weight of an object is directly proportional to its mass, so the greater the mass, the greater the weight. Since the 100-pound sack of rice has a higher mass than the 5-pound bag of sugar, it has a greater weight and therefore requires more force to lift. This is because according to Newton's second law of motion, the force required to move an object is directly proportional to its mass and acceleration. Therefore, it is harder to lift the heavier sack of rice compared to the lighter bag of sugar.

Answer 2

1 pound mass is equivalent to 0.454 kg mass

now the weight of the object of mass 1 pound will be

`W = mg = 0.454 * 9.8 = 4.45 N`

now force required to pull upward a 100 pound sack will be given as

`F = 100 * 4.45 = 445 N`

Also we can say that force required to pull a bag of 5 pound mass will be

`F = 5 * 4.45 = 22.2 N`

so here we can see that 22.2 N force is very small as we compare it with 445 N this is the reason it is easy to pull 5 pound bag of sugar then 100 pound sack of rice