# Simple Machines

## 14 terms

### machine

any device, either fixed or moving, that helps in accomplishing a task

### force

a push or pull that acts on an object to initiate or change its motion or to cause deformation

### effort force

an input force; imparting energy into a machine or system

the weight of an object that needs to be moved or resistance that a mechanical device must overcome to accomplish a task

### work

the amount of energy that is transmitted to or removed from an object by the action of a force through a distance

### power

rate of work with respect to time

### energy

a measure of the ability of an object to effect change in itself or the environment. It is a measure of the capacity for doing work (Units: Newton-meter = Joules)

### Conservation of Energy

energy can be neither created nor detsroyed, only altered in form

the ratio of the output force produced by a machine to the input force that is applied to the machine. Ratio that measures the degree to which a simple machine makes a job easier.

distance moved by effort in the direction of effort DIVIDED BY distance moved by resistance in direction opposite resistance

### friction

a type of resistance force that results when two objects move against each other