In the study of physics, non-uniform motion occurs, when an object travels an unequal distance in an equal amount of time. An example would be a car that travels 30 miles during the first hour of a trip and 50 miles during the second hour.
Uniform motion, in contrast, involves an object that covers an equal distance in an equal amount of time. An example might be a train that covers 20 miles per hour for an extended period. Because it may change at any given moment, the velocity of non-uniform motion can only be measured at a specific instant in time.Learn More
The law of inertia states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The law of inertia is sometimes referred to as Newton's first law of motion.Full Answer >
Friction is a force that opposes motion, so it is unhelpful in all situations where the motion of an object is desired. A by-product of friction is that energy is wasted in the form of heat, which can cause problems in temperature-sensitive environments.Full Answer >
Kinetic energy is used by exploiting the motion of an object. For example, the energy of a moving piston in an automotive engine provides transportation. The kinetic energy of moving water powers hydroelectric dams that provide electricity.Full Answer >
Unbalanced force occurs when two forces acting on an object are not equal in size, causing a change in motion. Unbalanced forces cause a still object to move or moving objects to slow down or speed up, stop or change direction.Full Answer >