# FoottoMeter

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Acceleration is the rate of change of velocity per unit time. More simply, acceleration is the change in speed in a given time.

A car that goes from 0mph to 60mph in 3 seconds is said to accelerate faster than a car that goes from 0mph to 60mph in 7 seconds.

`acceleration = velocity / time`

Angle is the rotation between two intersecting lines or surfaces.

For example, on an analog clock displaying a time of 3:00, the minute hand and the hour hand are 90 degrees apart. At a time of 6:00, they are 180 degrees apart.

Another example, is when using a pair of scissors, the angle between the blades is changing with each cut.

Area is the amount of surface a shape covers. The shape can be 2D, like a flat plane or floor, or 3D, like the surface of a sphere.

Data refers to the digital memory used by a computer to store information.

A harddrive with one terabyte (TB) of memory can store more files than a harddrive with 500 gigabytes (GB) of memory.

Energy is a unit that defines the capacity to do work. In simpler terms, it defines how much work a machine or person can do. If you have a lot of energy, you can do a lot of work.

Energy exists in many forms, such as thermal (heat from a burning candle), electrical (electricity powering your device), mechanical (motion of hammering a nail), chemical (gasoline powering a car), radiant (microwaves cooking a meal), and more.

Force is an influence that can change the motion of an object. A force can accelerate (change the speed of) an object, based on its mass.

`force = mass × acceleration`

Length is the distance between 2 points. Any two points, such as two locations on earth, or two ends of an object.

`length = abs(point2 - point1)`

Mass is the amount of matter in an object.

Power is the amount of energy transferred per unit time. Power allows machines to do work, over time.

A machine with more power can work faster, or it can do more work in the same time.

For example, a lightbulb that uses more power (more energy per second) can shine brighter. A car that uses more power can accelerate faster. A computer that uses more power can process faster. As long as a machine has power, it can keep working. Working is the act of using energy.

`power = energy / time`

Pressure is the force applied (perpendicular) to a surface per unit area.

`pressure = force / area`

Speed is the rate of change of position per unit time. More simply, speed is the amount of distance traveled in a given time. A fast object travels a large distance in a short time. A slow object travels a short distance over a long time. A distance along a straight line is called length.

`speed = distance / time`

Temperature is a measure of hotness or coldness. More specifically, the intensity of heat present in a substance or object.

Conversion between units of temperature is not always linear. For example:

0 °Celsius = 32°Fahrenheit
100 °Celsius = 212°Fahrenheit

Time is the period during which things exist and occur. More specifically, time is a continued sequence of existence and events.

Over time, the present becomes the past, and the future becomes the present.

`torque = force × radius`