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20 Cards in this Set

  • Front
  • Back
reluctance of body to change its state of motion. i.e. can still be moving
Mass (m)
quantity of matter of which a body is composed. Measure of body's inertia. (kg)
Force (F)
interaction between 2 bodies in push or pull, may/not cause motion. (N)
force required to give 1kg mass an acceleration of 1 m/s²
Weight (W)
attractive force of earth on body. Is a force ∴ a vector.

W=mg g=9.81m/s²
Centre of mass
Point of which mass of a body is evenly distributed (55-57% of height)
Centre of gravity
Point at which the weight of a body can be considered to act.

On earth, both are the same.
Calculation of centre of mass
Cadavers, Math geometric models, Mass scanning
Newton's Law of Inertia
every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces acting on it.
Newton's Law of Acceleration
change of motion α force applied and is made in the direction of the straight line in which that force is impressed.

Momentum (p)
quantity of motion of a body. (kg.m/s)

p=mv (kg.m/s)
F=p/t (N)
Law of action-reaction
To every action there is always an equal and opposite reaction
Measure of what is required to change the motion of a body. If a body is acted on by a force (F) during a certain time (time) the body has received an impulse. (N.s)


area under force-time curve
Moment of Inertia (I)
resistance of body to a change in angular motion. Depends on distribution of mass w.r.t. axis of rotation.

I=Σmr² (kg.m²)
Torque (T)
product of magnitude of force and perpendicular distance from line of action of force to axis of rotation (N.m)

Law 1:angular analogues of Newton's Laws of Motion
Rotating body will continue in state of uniform angular motion unless acted on by external torque
Law 2:angular analogues of Newton's Laws of Motion
External torque will produce angular acceleration of a body that is directly proportional to torque and indirectly proportional to moment of inertia of body

T=Iα = moment of inertia x angular acceleration
Angular Momentum (H)
quantity of angular motion of body (kg.m²/s)
H=Iω (ω is angular velocity in rad/s)
Conservation of angular momentum
remains constant unless an external torque is applied. i.e. decreasing moment of inertia (gymnast tucking) increases angular velocity
Law 3:angular analogues of Newton's Laws of Motion
For every torque exerted by one body on another body, an equal an opposite torque is exerted.