# Lesson 4

### 26 terms by K14Jules

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### Axle

A shaft on which a wheel rotates.

### Block and Tackle

Pulley blocks with associated rope or cable.

### Class 1 Lever

A lever in which the fulcrum is between the load and the effort.

### Class 2 Lever

A lever in which the load is between the fulcrum and the effort.

### Class 3 Lever

A lever in which the effort is between the fulcrum and the load

### Compound Machine

A machine made of more than one simple machine.

### Efficiency

The ratio of the output to the input of any system.

### Force

Force into or from an action or state, either physically or metaphorically.

### Helix

A structure consisting of something wound in a continuous series of loops.

### Inclined Plane

A simple machine for elevating objects.

### Lever

A rigid bar pivoted about a fulcrum.

### Linear Motion

Movement in a straight line.

### Machine

Any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks.

The ratio of the force exerted by a machine to the force applied to it.

### Mechanism

The technical aspects of doing something.

### Motion

The act of changing location from one place to another.

### Oscillating Motion

A back-and-forth movement that goes between two points; to vibrate.

### Pulley

A simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.

### Reciprocal Motion

Ability to reverse movement between opposing muscle groups.

### Rotary Motion

The act of rotating as if on an axis.

### Screw

A simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole.

### Simple Machine

A device for overcoming resistance at one point by applying force at some other point.

### Wedge

Something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them.

### Wheel

A simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)

### Work

Activity directed toward making or doing something.

### Fulcrum

The pivot about which a lever turns.

Example: