forces - gravity and weight Flashcards
what type of force is gravity? what type of quantity is it and why?
a non contact force. a vector quantity as it has a magnitude and direction
what does the mass of an object tell us? unit of mass?
how much matter the object has in it. kilogram (kg)
what type of quantity is mass?
scalar as it has no direction
what does the mass of an object not depend on?
where the object is
what is the weight if an object? unit of weight
an object is the force acting on it due to gravity.
unit Newton
what does the weight if an object depend on?
where it is
what is gravitational field strength on surface of earth?
9.8 N/kg
what is the gravitational field strength?
a measure of the force of gravity in a particular location
weight equation
weight (N) = mass (kg) x gravitational field strength(N/kg)
what is the weight if an object directly proportional to?
the mass of an object (double mass, double weight)
what do we use to determine an object’s weight?
a calibrated spring-balance. also called a newtonmeter
what does gravitational field strength depend on?
where you are
what is the centre of mass?
the weight of an object considered to act at a single point
