Machines make our work simpler. It is a force producing device by which a large force called load can be overcome by a small applied force called effort Terminologies Used In Machines FORCE RATIO (MECHANICAL ADVANTAGE ) VELOCITY RATIO EFFICIENCY MECHANICAL ADVANTAGE We define effort as the force applied to a machine and load as […]
MEANING OF PROJECTILE A projectile motion is one that follows a curved or parabolic path .It is due to two independent motions at right angle to each other .These motions are a horizontal constant velocity a vertical free fall due to gravity Examples of projectile motion are the motion of; a thrown rubber ball re-bouncing
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CONCEPT OF SCALAR AND VECTOR QUANTITIES Physical quantities are divided into scalar and vector quantities. A scalar is one which has only magnitude (size) e.g. distance, speed, temperature, volume, work, energy, power, mass etc. A vector quantity has both magnitude and direction e.g. force, weight, magnetic flux, electric fields, gravitational fields etc. VECTOR REPRESENTATION A
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CONDITIONS FOR EQUILIBRIUM A body is said to be in equilibrium if under the action of several forces, it does accelerate or rotate. The sum of the upward forces must be equal to the sum of the downward forces. The sum of the clockwise moment above a point must be equal to the sum
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BASIC DEFINITIONS Displacement: This is the distance traveled in a specified direction. It is a vector quantity. Its unit is metres Distance: This is the space or separation between two points. It is a scalar quantity. Its unit is metres Speed: this is the rate of change of distance with time. It is a scalar
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NEWTON’S LAWS OF MOTION Newton’s first law of motion states that everybody continues in its state of rest or of uniform motion in straight line unless it is acted upon by a force. The tendency of a body to remain at rest or, if moving, to continue its motion in a straight line is called
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This is the periodic motion of a body or particle along a straight line such that the acceleration of the body is directed towards a fixed point . A particle undergoing simple harmonic motion will move to and fro in a straight line under the influence of a force. This influential force is called a
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POSITION The position of an object in space or on a plane is the point at which the object can be located with reference to a given point (the origin). DISTANCE This is a measure of the separation between two points. It has magnitude but no direction. Hence, it is a scalar quantity DETERMINATION
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