Answer to Question #140861 in Physics for Saad

Question

2. Determine your weight (e.g., the force of gravity on you).
3. Determine what normal force would be required to accelerate you upwards from ground level at a rate of 2.0 or 3.0 m/s^2 (choose one acceleration value).
4. What would the normal force be if the acceleration described in (3) was directed downwards?

Answer 1

2)

$$W=mg=(80)(9.8)=784\ N$$

3)

$$N=m(a+g)=80(2+9.8)=944\ N$$

4)

$$N=m(-a+g)=80(-2+9.8)=624\ N$$