![]() This law states that every action has an equal and opposite reaction.įor example, if a ball is placed on the table, the ball will exert a force on the table. ![]() This is a consequence of Newton's Second Law. Weight and mass are related by the equation: Mass is the amount of matter that a body contains and is measured in kilograms (kg). Weight is the force due to gravity and is measured in newtons. Students are often confused about the difference between weight and mass. This is sometimes written as F = ma, though you should make sure you understand what this means (in particular, note that F is resultant force). Resultant Force on Body = Mass of Body × Acceleration of Body In fact, from Newton's Second Law we can derive the following equation: By how much the acceleration changes depends upon the magnitude of the force applied. In other words, when an overall force is applied to an object, the acceleration will change. Newton's Second Law of Motion states that the rate of change in momentum of the body is directly proportional to the net force applied. The body moves at a constant speed of 5m/s. The following forces are acting on a body. if it is moving at a constant velocity), we know that the resultant (overall) force in any one direction will be zero. So, if we are told that a body is not accelerating (i.e. Put another way, if the forces on an object balance, there will be no acceleration (the object will continue at the same speed). This means that in order for the acceleration of a body to change, there must be a net force applied to the body. ![]() Newton's First Law of Motion states that a body will remain at rest or will continue to move at a constant velocity, unless an external force is applied. Newton's laws of Motion covers Newtons three laws.Ī force is "an influence tending to cause the motion of a body" (Oxford English Dictionary).įorces are usually represented diagrammatically as an arrow, pointing in the direction the force.
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