In physics, motion is change with time of the position or orientation of a body. The motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame with a change in time. Mathematically motion is described in terms of displacement (m), velocity (m/s), acceleration (m/s)/s, and time (s). The main quantity that measures a body's motion is momentum, which increases with the object's mass and with its velocity. The standard metric unit of momentum is the Kg•M/s. The total momentum of all objects in an isolated system (one not affected by external forces) does not change with time, as described by the law of momentum conservation. An object's motion, and thus its momentum, cannot change unless a force acts on the body. Isaac Newton discovered that all objects move according to three basic laws; The first law is the Law of Inertia, which says that an object either remains at rest or continues to move at a constant velocity in an inertial reference frame unless acted upon by a net force. The second law is the Law of Forces- If something is not moving in a straight line, a force must be acting on it to change its direction. The third law is the Law of Rockets: for every action, there is an equal and opposite reaction.
Motion impacts on everyday life are inevitable. If we consider humans, they are in motion in various ways, aside from obvious movements of the different external body parts and locomotion. When they are resting, the heart moves blood through their veins.
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If we consider an aircraft's performance, its movement at a constant altitude neglecting the lift and weight, when the thrust and drag are equal, the plane holds a uniform motion. This is the first part cited in Newton's first law; there is no net force on the airplane, and it travels at a constant velocity in a straight line. From Newton's first law, a net external force changes the speed of the object. Now, if the thrust is increased, the aircraft accelerates, and the velocity increases.
Give as many examples of physical quantities (vectors and scalars) don’t forget the SI units
Scalar Quantities: The physical quantities which are specified with the magnitude or size alone. E.g., length (m), speed (m/s), work (J), mass Kg, density Kg/m 3.
Vector Quantities: the physical quantities characterized by the presence of both magnitude as well as direction. E.g., displacement (m), force (N), torque (N ⋅ m), momentum ( Kg•m/s), acceleration (m/s)/s, velocity (m/s)
A sports car is advertised to have a maximum cornering acceleration of 0.85 g. What is its maximum speed for a 50-m radius curve? Ans=20.4 m/s
