Simple Machines

Question 1

Of the six simple machines, name the two basic machines.

Answer 1

1. The Lever
2. The inclined Plane

Question 2

Name the six simple machines

Answer 2

1. The Lever
2. The Inclined Plane
3. The Wedge
4. The Screw
5. The Wheel and Axle
6. The Pulley

Question 3

Describe the first class lever

Answer 3

1st class increases effort force and reverses direction. The fulcrum is the pivot point. The effort (E) is the force being applied to move the load. The resistance (R) is the Load. Resistance Distance (RD) is the distance from the (R) to the fulcrum. The effort distance (ED) is the distance from (E) to the fulcrum. EX: pliers, Wrench2nd class multiples force and direction is the same function as the pivot point, the ED is longer than the RD. EX: Wheelbarrow3rd class the lever multiplies speed or distance rather than force, the RD is longer than the ED. EX: Fishing Pole

Question 4

Describe the inclined Plane

Answer 4

Includes a slope or hypotenuse, the RD is the height, the ED is the Slope, the E is the push or pull and the R is the Load. It is basically a right triangle. EX: A ramp

Question 5

The wedge

Answer 5

The ED is the adjacent side of the right triangle, the E is the Force used to push the wedge, R is the Load and the RD is the height of the wedge.EX: Taper shanks, holding device, or cutter.

Question 6

Describe the Screw

Answer 6

A screw is a combination of the inclined plane, the wedge and the wheel and axle, used to transmit motion, apply tremendous force, hold parts together and obtain measurements. The number of threads per inch or pitch is the RD, the ED is the circumference of the tool or handle used to apply the force, E is the force and R is the Load it will lift. EX: Screws on a jack, bolt

Question 7

Describe the Wheel and Axle

Answer 7

Sometimes called a “continuous lever” serves one of the two basic functions of transmitting force or producing a change in speed. Cannot have an increase in speed and force, the relationship is inversely proportional. ED is the distance from the center of the wheel or axle that the E or force is being applied. The RD is the distance from the center of the wheel or axle that the load or R is being raised. EX: Screwdriver, chain hoist, speed handle.

Question 8

Describe the Pulley

Answer 8

Is a wheel that rigidly fastened to a shaft on which it turns and transmits either to or from the shaft. Pulleys are generally used in pairs. There are fixed and movable pulleys, when several pulleys are used together it is called a block and tackle. EX: Crane block and tackle hooks