# Shared Flashcard Set

## Details

Rote for PA02
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18
Physics
08/26/2006

Term
 A moment of a force (or torque)
Definition
 A moment of a force (or torque) is the product of the magnitude of the force and the perpendicular distance of the line of action of the force from the axis
Term
 couple
Definition
 The torque due to a couple is the product of one of forces and the separation between them.
Term
 The centre of gravity
Definition
 The centre of gravity of a body is the point through which its weight acts. Were it to be supported at that point there would be no net gravitational moment acting on the body.
Term
 centre of mass
Definition
 The centre of mass of a body is the point through which its mass acts. In the absence of a pivot a body acts as if it were pivoted at its centre of mass.
Term
 Absolute zero
Definition
 Is the temperature at which the pressure and volume of an ideal gas would be zero. All vibrational motion of the particles would cease. It is 0K (-273oC)
Term
 principle of moments
Definition
 The principle of moments states that for a body to be in equilibrium, the sum of the clockwise moments about any axis is equal to the sum of the anticlockwise moments about that same axis.
Term
 Newton’s First Law of Motion
Definition
 Every body continues in its state of rest or uniform motion in a straight line unless acted upon by an external force.
Term
 Newton’s Second Law of Motion
Definition
 The rate of change of momentum of a body is directly proportional to the force acting upon it and takes place in the direction of the force.
Term
 Newton’s Third Law of Motion
Definition
 Whenever a body A exerts a force on a body B, body B exerts a force of equal magnitude but opposite direction on body A.
Term
 Principle of Conservation of Linear Momentum
Definition
 The Principle of Conservation of Linear Momentum states that the total linear momentum of a system of interacting bodies, on which no external forces are acting, remains constant.
Term
 Specific heat capacity
Definition
 Specific heat capacity of a substance is the heat energy required to raise the temperature of one kilogram of that substance by one degree Kelvin.
Term
 specific latent heat of fusion
Definition
 The specific latent heat of fusion of a substance is the energy required to change the state of one kilogram of the substance in its solid state to the liquid state without raising its temperature above its melting point.
Term
 specific latent heat of vaporization
Definition
 The specific latent heat of vaporization of a substance is the energy required to change the state of one kilogram of the substance in its liquid state to the gaseous state without raising its temperature above its boiling point.
Term
 What is the equation of state?
Definition
 pV = nRT where: p = pressure V = volume n = number of moles R = molar gas constant T = absolute temperature (measured in Kelvin – make sure you can convert from Celsius to Kelvin and vice versa!))
Term
 What is the equation for kinetic energy?
Definition
 EK = ½ mv2
Term
 What is the equation for change in gravitational potential energy?
Definition
 delta Ep = mg delta h
Term
 What conditions must be met for you to apply Newton’s equations of motion to a body?
Definition
 The body must be under constant acceleration conditions (e.g. falling under gravity).
Term
 What is the equation for momentum?
Definition
 p = mv where: p = momentum (Ns)m = mass (kg) v = velocity (m/s)
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