Forces, Energy work and power, circular motion and gravitational field. Flashcards
centre of gravity
the point from where all the weight of a body seems to act
Hooke’s Law
states that the change in length of a material is directly proportional to the force applied on it, provided that the limit of proportionality is not exceeded.
moment of a force about a point
the product of the force and the perpendicular distance of the point from the line of action of the force
work done by a force
the product of the force and the displacement in the direction of the force
gravitational potential energy
the energy of a mass due to its position in the gravitational field
kinetic energy
the energy possessed by a mass due to its speed
elastic potential energy
the ability to do work by the object when it is deformed
angular displacement
the angle swept out by a radius
angular velocity
the rate of angular displacement swept out by a radius
gravitational force of attraction
between two point masses is directly proportional to the product of their masses and inversely proportional to the square of their separation
gravitational field strength at a point in the field is defined as
the gravitational force experienced per unit mass by a small test mass placed at that point in the field
gravitational potential energy of a mass at a point in a gravitational field
the work done by external force in bringing the mass from infinity to that point
gravitational potential at a point
the work done per unit mass by an external force in bringing a small test mass from infinity to that point
