A penny has a mass of 2.5 grams. It is laying on level ground. What is the normal force acting on the penny?

0.0245 N

Explanation:

Given that a penny has a mass of 2.5 grams. Convert the gram to kilogram by dividing it by 1000

2.5/1000 = 0.0025kg

It is also given that it is laying on level ground.

The normal force will be directly opposite direction to the weight of the penny. Which will be of equal magnitude.

What is the normal force acting on the penny ?

Normal force = weight of the penny

Weight = mg

Where g = 9.8 m/s^2

Weight = 0.0025 × 9.8

Weight = 0.0245 N

Therefore, the Norma force = 0.0245N

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