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Measurement and Motion
IGCSE Combined Science Physics Topic 1
13
Science
9th Grade
09/17/2009

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Cards

Term
Force
Definition
a push or a pull (unit: newton - N)
Term
Effects of a force
Definition
change shape, size, direction and speed (accelerate, decelerate)
Term
Relationship between force, mass and acceleration
Definition
F = ma
Term
Relationship between force and extension
Definition
Force is proportional to the extension as long as the elastic limit is not reached (Hooke's law)
Term
Moment
Definition
the product of force and distance (from a pivot); unit - Nm
Term
Principle of moments
Definition
when an object is in equilibrium, clokwise moments equal anticlockwise moments
Term
Mass
Definition
Ammount of matter in an object
Term
Weight
Definition
force of gravity acting on a mass
Term
Centre of mass
Definition
the point in an object where gravity appears to act
Term
Density
Definition
mass per unit volume of a substance (Unit: kg/m3)
Term
speed
Definition
rate of change of distance (Unit: m)
Term
velocity
Definition
rate of change of displacement (unit: m plus direction)
Term
equation for speed
Definition
distance = speed x time
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