1. A smuggler wants to check in 40kg of luggage, but the regulation says that th

Question

1. A smuggler wants to check in 40kg of luggage, but the regulation says that the maximum mass is 30kg. What should a smuggler do after he puts the luggage on the scale to make the scale show a 30kg reading? Your answer should indicate the direction and the magnitude of the force that he should exert on the luggage while it is on the scale. To answer the question, draw a free body diagram with the luggage as the system and then apply Newtons third law to relate your diagram to the reading of the scale.

2. What is the equation for magnetic force? What is the force from, and what is the force acting on ?

Explanation / Answer

The luggage would exert a downward force of 40*9.8 = 392N. But you wish it to exert a 30*9.8 = 294N force downwards. Therefore you must exert an UPWARD force of 392-294 = 98N upward.
The free body diagram will show an applied downward force of 392N, an upward aplied force of 98N and a resultant downward force of 294N.

The force acting on the luggage

here, gravitational force: F=mg= 40*9.8 = 392N

downward force of 392N.

But we need: gravitational force F=mg= 30*9.8 = 294N

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