# Classical Mechanics Topics

**6.67e-11 Nm**^{2}kg^{-2}- Gravitational constant.
**9.80665 ms**^{-2}- Standard acceleration due to gravity.
**Absolute Motion**- Motion relative to a fixed point.
**Absolute Space**- Space that is not affected by what occupies it or occurs within it and that provides a standard for distinguishing inertial systems from other frames of reference.
**Absolute Velocity**- The vector sum of the velocity of a fluid parcel relative to the earth and the velocity of the parcel due to the earth′s rotation.
**Accelerate**- To increase the speed of an object.
**Acceleration**- The change in velocity divided by the time it takes to make the change.
**Angular Frequency**- The frequency of a steady recurring phenomenum in radians per second.
**Angular Momentum**- A vector quantity giving the rotational momentum.
**Angular Rate**- The rate of change of angle.
**Angular Velocity**- The rate of change of angle turned in radians.
**Ballistics**- Ignoring the curvature of the Earth, frictional losses and that g is constant it is possible to calculate the trajectory of a projectile that is fired with a given initial velocity and elevation.
**Classical Mechanics Books**- Lists all Classical Mechanics Books in the Encyclopaedia
**Classical Mechanics Calculations**- Lists all Classical Mechanics Calculations in the Encyclopaedia
**Classical Mechanics Conversions**- Lists all Classical Mechanics Conversions in the Encyclopaedia
**Classical Mechanics Weblinks**- Lists all Classical Mechanics Weblinks in the Encyclopaedia
**Collision**- An encounter between two ojects that changes their existing momentum and energy conditions.
**Conservation of Angular Momentum**- The total angular momentum of a system is constant unless an external torque acts on it.
**Conservation of Momentum**- If the net external force on a system is zero, the total linear momentum of the system does not change.
**Density**- The derived SI unit of density is kgm
^{-3} **Elastic Collisions**- When two bodies collide their total momentum is conserved unless external forces act on them.
**Equivalence Principle**- Constant acceleration is completely equivalent to a uniform gravitational field.
**Escape Velocity**- This is the initial velocity that an object would have to have if projected from the surface of a body (e.g. Earth) to reach infinity before coming to rest.
**G-Force**- The apparent increase in weight of an object due to gravitational forces.
**Gravity, Standard Acceleration due to**- g = 9.80665 ms
^{-2} **Group Velocity**- A group may be made up of a number of different frequencies, wavelengths and velocities that are superposed. Such a group would disperse with time if the wave velocity of each component is different.
**Kinematics**- A branch of mechanics dealing with the motion of rigid bodies without reference to their masses or the forces acting on the bodies.
**Kinetic Energy**- The energy that a body possesses solely because it is moving.
**Kinetic Heating**- Heating as a result of air friction.
**Linear Momentum**- A vector quantity equal to the product of an object's mass and its velocity.
**Mass Density**- Mass per unit volume.
**Momentum**- Usually refers to linear momentum, a vector quantity equal to the product of an object's mass and its velocity.
**Newtonian Mechanics**- The system of mechanics based upon Newton laws of motion in which mass and energy are considered as separate, conservative, mechanical properties, in contrast to their treatment in relativistic mechanics.
**Parallelogram of Forces**- A method of resolving two forces acting on an object. This is also a great way of visualising the forces and hence resultant.
**Periapsis**- The point of an orbit nearest to the centre of attraction of an orbiting body.
**Pericentre**- The point on a spacecrafts orbit at which it is nearest to the centre of mass of the system.
**Pericynthian**- That point in the trajectory of a vehicle which is closest to the moon.
**Perigee**- The point of a satellite's orbit closest to Earth.
**Perigee Speed**- The speed of an orbiting body when at perigee.
**Perihelic Opposition**- When the Earth passes between a planet and the Sun when the planet is at its closest from the Sun.
**Perihelion**- The point of closest approach for any object orbiting the sun.
**Potential Gradient**- The local space rate of change of any potential.
**Rotational Inertia**- The property of an object that measures its resistance to a change in its rotational speed.
**Rotational Kinetic Energy**- The energy a body possesses due to it's rotation about an axis.
**Standard Acceleration due to Gravity**- g = 9.80665 ms
^{-2} **Static**- A fixed nonvarying condition, without motion.
**Static Equilibrium**- Equilibrium which does not include inertial forces.
**Static Friction**- The frictional force between two surfaces at rest relative to each other.
**Steady State**- A condition devoid of transient effects.
**Theoretical Density**- This is the density of a material calculated from the atomic weight and crystal structure.
**Theoretical Rocket**- An ideal Rocket.
**Torque**- The torque or turning moment acting on a body is defined as the product of the magnitude of the force and the perpendicular distance of the line of action of the force from the axis about which the body is being rotated.
**Two Body Problem**- Classical celestial mechanics which treats of the relative motion of two point masses under their mutual gravitational attraction.
**Velocity**- Velocity is a vector quantity that specifies the time rate of change of displacement with respect to a reference frame.
**Velocity of Escape**- This is the initial velocity that an object would have to have if projected from the surface of a body (e.g. Earth) to reach infinity before coming to rest.
**Velocity Time Profile**- A plot of velocity versus time. The area under thge graph is the total distance travelled.

**Subjects: ** Mechanical Engineering Physics