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Q:

# What are the different kinds of motion?

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The better-known forms of motion include rotary motion (turning round in a circle), linear motion (moving in a straight line), reciprocating motion (moving backward and forward in a straight line), oscillating motion (swinging from side to side), irregular motion (moving with no obvious pattern) and uniform motion (moving at constant speed in a straight line). Kinematics is the science that studies the motion of objects.

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Motion is movement, and it can also be defined as a continuous change in the position of an object along a specific vector. Each type of motion is controlled by a different type of force.

There are two types of basic motion. Translation means motion along a path and is defined by the net force (the sum of different forces) acting on an object, while rotation means motion around a fixed axis and is defined by torque (force that causes the rotation of an object).

Many mechanisms take one type of input motion and output it as a different type of motion. For example, a chain and sprocket changes rotary motion to linear motion. A cam and follower changes rotary motion to reciprocating motion, and a peg and slot changes oscillating motion to rotary motion.

## Related Questions

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Air resistance, also called drag, acts upon a falling body by slowing the body down to the point where it stops accelerating, and it falls at a constant speed, known as the terminal velocity of a falling object. Air resistance depends on the cross-sectional area of the object, which is why the effect of air resistance on a large flat-surfaced object is much greater than on a small, stream-lined object.

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Uniform motion describes an object that is moving in a specific direction at a constant speed. While uniform motion typically describes objects moving in a straight line, uniform circular motion consists of an object moving in a perfect circle at a constant speed.

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When an object reaches its terminal velocity, it can no longer accelerate, so its acceleration becomes zero, and it falls at a constant speed. As an object falls freely through the air, it has two forces acting upon it: gravity and drag.