question
how can we say for any force that it is variable??
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a quantity which can very from one individual to another is called a variable. physics 101 notes: 8/25 (week 2 continued)  force o defined as a push or a pull, and is a vector quantity, meaning that it has direction depending on which way it is being pushed or pulled o it has amount and direction (how much force is being applied and in which direction it is moving)  newton’s first law o first draft: “an object that is free of forces move in a straight line and covers equal distances in equal time” o final: “an object that is free of external forces moves at a constant velocity”  how does a skater start, stop, or turn? o acceleration: “the rate at which an object’s velocity is changing with time o acceleration, s no, the moment of force is a vector quantity. coefficient of friction is defined as the ratio of the force of friction acting between two objects and the force which is pushing them together. the value of the coefficient of friction varies from zero to one. there are two types of the coefficient of friction: static coefficient of friction kinetic (also known as sliding) coefficient of friction. therefore, the coefficient of friction depends on the nature of the surface. when a volleyball player smashes a ball, he changes the speed as well as direction of the ball. this is a change of state of motion. however, a change in state of motion is said to occur also when either of the two changes individually. when the water on the surface of the ocean rises and falls alternately, they are called waves. during a storm, the winds blowing at very high speed form huge waves. these may cause tremendous destruction. yes. let us consider a block a which is resting on another block b. block b is resting on a smooth horizontal surface. let the coefficient of friction between the blocks be \[\mu\] . when a force f is applied on block b in the forward direction as shown in the above figure, block a moves with block b in the direction of the applied force. the frictional force on block a and the displacement will be in the forward direction. therefore, work done by the frictional force is positive. if we consider the reference frame of block b, then displacement of block a will be zero. therefore, work done by the frictional force is zero. that depends on a lot of things. in particular, you would need to find the electric susceptibility of the paper. the field produced by static charge is inverse-square. the polarization of the paper varies directly with the external field, with a proportionality constant equal to the electric susceptibility. the dipole field created by the polarized paper is inverse-cube. overall, the force between the ruler and the paper will vary with the inverse fifth power of distance. to get any more detailed, you would need to know the geometry of the situation, and the charge distribution. chemistry 1010 study guide classify the following properties as intensive or extensive: intensive- doesn’t change (boiling point, temp, color, density, hardness) extensive- changes in size/ amount (volume, mass length scientific method terms experiment: a well-controlled procedure used to obtain data in order to describe a phenomenon. law: a statement that describes natural phenomenon by summarizing collected facts. observation: a statement describing a natural phenomenon that we sense. scientific fact: a statement that is explained by reproducible experimental data hypothesis: guesses that is not verified yet. mass and weight mass is a measurement of the quantity of matter in an object, whereas weigh is a measurement of the force of gravity on the matter of an object; ther we first define our axisupward is along + y direction of axiseastward is along + x direction of axisvelocity of a aeroplane = velocity of a bullet = a person on the earth will see the bullet having a resultant velocity and angle θ with the vertical (y axis)θ = angle with the vertical (y axis)