Review Introduction to Levers

1. A second-class lever has its __________.

- Effort arm between the fulcrum and the load

- Fulcrum between the effort arm and the load

- Load between the fulcrum and the effort arm

- Effort arm directly on top of the fulcrum

Load between the fulcrum and the effort arm

2. A third-class lever has its __________.

- Effort arm between the fulcrum and the load

- Fulcrum between the effort arm and the load

- Load between the fulcrum and the effort arm

- Effort arm directly on top of the fulcrum

Effort arm between the fulcrum and the load

3. A first-class lever has its __________.

- Effort arm between the fulcrum and the load

- Fulcrum between the effort arm and load

- Load between the fulcrum and the effort arm

- Effort arm directly on top of the fulcrum

Fulcrum between the effort arm and load

A wheelbarrow is an example of a __________ lever.

- First-class

- Second-class

- Third-class

- Fourth-class

Second-class

5. A spring scale is used to measure __________.

- Force

- Mass

- Torque

- Rotary moment

Force

The English unit of measurement of weight is the __________.

- Pound-mass (lb-m)

- Foot-pound (ft-lb)

- Pound-force (lb-f)

- Inch-pound (in-lb)

Pound-force (lb-f)

7. If there is more than one force acting on a lever, the Law of Moments can still be applied by __________ each of the forces acting on the lever.

- Adding

- Subtracting

- Deleting

- Multiplying

User did not select an answer.

Adding

8. A(n) __________ is produced when the forces applied to a lever cause it to rotate.

- Rotary impact

- Rotational moment

- Torque

- Inclined plane

Rotational momen

9. A __________ is a bar or beam atop a fulcrum that is used to transmit force from one point to another.

- Wheel

- Widget

- Inclined plane

- Lever

Lever

10. Hooke's Law states: The __________ of an elastic material is directly proportional to the applied force.

- Hardness

- Elasticity

- Deformation

- Softness

Deformation

The Law of Moments can be used to determine __________.

- How much force is needed to balance a load

- How much force is needed to move a load

- Neither A nor B above

- Both A and B above

Both A and B above

12. To calculate the weight of a object, you need to know the mass of the object and the __________.

- Circumference of the object

- Gravitational acceleration of the Earth

- Diameter of the object

- All of the above

Gravitational acceleration of the Earth

13. Torque can be calculated by multiplying the distance from the fulcrum that a force is applied and __________.

- The distance from the resistance arm

- The diameter of the load

- The mass of the load

- The force applied

The force applied

14. A pair of ice tongs are an example of a __________ lever.

- Third-class

- Fourth-class

- First-class

- Second-class

Third-class

15. The English unit of measurement of mass is __________.

- Pound-mass (lb-m)

- Foot-pound (ft-lb)

- Pound-force (lb-f)

- In-pound (in-lb)

Pound-mass (lb-m)

16. A crowbar is an example of a __________ lever.

- First-class

- Second-class

- Third-class

- Fourth-class

User did not select an answer.

First-class

17. Which of the following is one of the six mechanism safety rules?

- Use your left hand to operate the motor switch.

- Remove the back cover of the panel.

- Keep your work area safe and clean.

- Do not remove the fuse cover.

Keep your work area safe and clean

18. The mechanical advantage of a first-class lever can be found by the ratio of the length of the __________ arm divided by the length of the __________ arm.

- Resistance, effort

- Effort, resistance

- Resistance, fulcrum

- Effort, fulcrum

Effort, resistance

19. The mechanical advantage of a third-class lever can be found by the ratio of the length of the __________ arm divided by the length of the __________ arm.

- Resistance, effort

- Effort, resistance

- Resistance, fulcrum

- Effort, fulcrum

Effort, resistance

The three common types of mechanisms are levers, __________, and inclined planes.

- Chains

- Gears

- Wheels

- Crowbars

Wheels

The mechanical advantage of a second-class lever can be found by the ratio of the length of the __________ arm divided by the length of the __________ arm.

- Resistance, effort

- Effort, resistance

- Resistance, fulcrum

- Effort, fulcrum

- Effort, resistance

22. A machine is a system of __________.

- Pulleys

- Mechanisms

- Gears

- Widgets

Mechanisms

23. The English unit of measurement of torque is the __________.

- Foot-pound

- Newton-meter

- Foot-Newton

- Inch-foot

Foot-pound

24. A force can be defined as a(n) __________ or __________.

- Push or shove

- Pull or tug

- Shove or tug

- Push or pull

Push or pull

25. Mechanical advantage is the ratio of the force required to move a load divided by __________.

- The weight of the load

- The mass of the load

- The diameter of the fulcrum

- The effort force applied

The effort force applied