A) the ruler begins to rotate under the action of the forces, but the forces ret

Question

A) the ruler begins to rotate under the action of the forces, but the forces retain their direction (straight up and straight down). After the ruler rotates through a small angle, what happens to the net torque on the ruler net and the force exerted by the fulcrum on the rod?

1. ?net decreases, Ff remains the same

2. ?net increases, Ff increases    

3. ?net remains the same, Ff remains the same

4. ?net remains the same, Ff decreases

5. ?net decreases, Ff increases

6. ?net decreases, Ff decreases

7. ?net increases, Ff decreases

8. ?net increases, Ff remains the same

9. ?net remains the same, Ff increases

B) Assume the ruler is balanced as shown: mass m2 = m on the right, and mass m1= am on the left, where a is a number greater than 1. If m1 is moved 1 cm to the left, how many cm to the right must you move m1 to keep the system in equilibrium?

1. more than a

2. exactly 1    

3. between 1 and a

4. exactly 1/a

5. less than 1/a

6. exactly a

Explanation / Answer

A)net torque decrease but Force remains the same

B)4. exactly 1/a

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