Posts

VELOCITY AND ACCELERATION

Image
An object is said to be at rest if it doesn’t change its position or move from its position with respect to its surrounding objects. An object is said to be in motion if it changes its position with respect to its surrounding objects. If a body covers equal distance in equal interval of time, it is said to be in uniform motion. If a body covers unequal distance in equal interval of time, it is said to be in variable motion. The quantities which can be measured are known as physical quantities. There are two types of physical quantities. They are: Scalar quantities Vector quantities Physical quantities having only magnitude but no direction is known as scalar quantities. Physical quantities having both magnitude and directions known as vector quantities.  Scalar quantity  Vector quantity It has only magnitude. It has both magnitude and direction. The sum of scalar quantities is always zero. 2.    The sum of vector quantities may be           n...
Post a Comment
Read more

SIMPLE MACHINE

Image
The device consisting of very few parts that makes work easier, faster or more convenient is called simple machine. Complex machine are formed by combination of many simple machines. Functions of simple machines are : A simple machine is used to overcome a load by applying small force. A simple machine is used to change the direction of force. A simple machine increases the speed of work. Effort is the force applied to the machine. Load is the force applied by the machine to the body. Fulcrum is the support point required to turn or rotate the machine. The distance of effort from fulcrum is effort arm. The distance from fulcrum to load is load arm. The work done on the machine is called input work. Input work = effort × effort arm The work done by the machine on the load is output work . Output work = Load × Load arm The ratio of load overcome by a machine to effort applied in the machine is mechanical advantage. Mechanical advantage =  load effort The velocity ratio of a simple ...
Post a Comment
Read more

MEASUREMENT

Image
                                                                         Measurement is the comparison between unknown quantities with known standard quantities. Some of the importance of measurement are: Measurement is important for selling and buying goods in markets. It is essential for doing chemical experiments. It is necessary for doing new inventions. It is important for making laws and rules. Physical quantities are those quantities which can be measured and are countable. For example: height, weight, length, etc. Non-physical quantities are those quantities which cannot be measured and are not countable. For example: love, emotion, anger, ...
2 comments
Read more