Problem 1 Calculate mass, force, or acceleration as appropriate. If the situatio

Question

Problem 1 Calculate mass, force, or acceleration as appropriate. If the situation is impossible, say so. a. The force on a 20 kg object is 30 N downward. What is its acceleration? b. A 20 kg object is held stationary. What is its acceleration? c. A 20kg object is held stationary on the earth. What is the sum of all forces on the object other than gravity? d. You try in vain to slide an object on the floor, exerting 30 pounds of force. What is the frictional force opposing you? e. A 20kg object accelerates at 10 m/s northeast. What is the total force on the object? f. An object accelerates 10 m/s2 northeast. The total force on the object is 30 N south- east. What is the mass?

Explanation / Answer

a) zero.
since net force is zero.

b) zero
since gravitational force acts downward and normal force acts upward which has same magnitude as gravitational force.
so, net force becomes zero.
as net froce is zero acceleration is also zero.

c) zero

since gravitational force acts downward and normal force acts upward which has same magnitude as gravitational force.
so, net force becomes zero.

d) 30 pounds.

e) usng Newton's second law, Fnet = m*a

= 20*10

= 200 N

f) it is impossible. Because, the direction of acceleration is always in the direction of net force.

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