An 80 kg man is riding in an elevator from the first floor to the 34th floor. The elevator and man are moving at a constant speed. What is the net force on the man in Newtons.
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Net force = Weight + (mass * acceleration )
To calculate the net force on the man, we need to consider the forces acting on him. There are two main forces at play: the gravitational force and the normal force.
The gravitational force is given by the equation:
Fgravity = mass x acceleration due to gravity
The acceleration due to gravity is approximately 9.8 m/s^2.
The mass of the man is given as 80 kg. So, the gravitational force is:
Fgravity = 80 kg x 9.8 m/s^2
Fgravity ≈ 784 N
Now, let's consider the normal force. The normal force is the force exerted by a surface to support the weight of an object resting on it. In this case, the man is standing on the floor of the elevator. Since he is not sinking through the floor or floating, the normal force must be equal and opposite to the gravitational force.
Therefore, the net force on the man is equal to zero. In other words, the upward normal force on the man cancels out the downward gravitational force.
So, the net force on the man in Newtons is 0 N.