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A train moving along a straight track and a ball rolling along a flat surface are both examples of objects moving in linear motion where they move in a straight line.
An object can move in a straight line, known as linear motion, or it can rotate around a fixed axis, known as rotational motion.
The two types of motion according to direction are linear motion and rotational motion. Linear motion is when an object moves along a straight path, while rotational motion is when an object spins or rotates around a fixed point.
The two concepts that make up linear motion are distance and time. Distance refers to the displacement of an object in a straight line, while time measures the duration taken for the object to move from one point to another in that line.
Friction is the force that opposes the motion of two surfaces sliding against each other. When two surfaces rub against each other, the friction between them generates heat, which can cause the objects to move. The force of friction works to slow down or stop the movement of the objects.
Uniform linear motion refers to an object moving in a straight line with a constant velocity. This means that the object covers equal distances in equal intervals of time. The speed and direction of the object do not change during uniform linear motion.