C. Turning Effect-Moment of forces

1.

• A

• B

• C

• D

2. When will two equal and oppositely directed forces acting on an object will be in equilibrium?

a. Only if they act on the same point on the object

b. If they are separated by a distance

c. When they are balanced by a third force

d. when their moments about the same point are equal

• A

• B

• C

• D

3. 3.

• A

• B

• C

• D

4. Which one of the following activities does not apply the turning effect of a force?

a. swinging on a swing

b. sliding down a slide

c. moving up and down on the see-saw

d. rowing a boat

• A

• B

• C

• D

5. The turning effect of a force on a door is greater when it is applied at?

a. A point near the hinges and perpendicular to the door

b. A point near the hinges and parallel to the door

c. A point far away from the hinges and perpendicular to the door

d. A point far away from the hinges and parallel to the door

• A

• B

• C

• D

6. What is the equation for moments?

a. Moment = force x perpendicular distance from pivot

b. Moment = mass x velocity

c. Moment = force x distance

d. Moment = force x parallel distance from pivot

• A

• B

• C

• D

7. 7.

• A

• B

• C

• D

9. Which force and distance produce the biggest moment about a pivot?

a. a 8.0 N force at a perpendicular distance of 4.0 m from the pivot

b. 7.0 N force at a perpendicular distance of 5.0 m from the pivot

c. a 6.0 N force at a perpendicular distance of 6.0 m from the pivot

d. a 3.0 N force at a perpendicular distance of 9.0 m from the pivot

• A

• B

• C

• D

10. 10.

• A

• B

• C

• D

8. Which of the following scenarios demonstrates the principle of moments?

a. A person pushing a car

b. A child on a seesaw

c. A book resting on a table

d. A ball rolling down a hill

• A

• B

• C

• D