Forces and Motion Flashcards
what would happen if an object at rest is pushed with a force of 6N and pulled with a force of 6N?
it will remain at rest because the forces are balancec
what would happen if an object at rest is pushed with a force of 6N and pulled with a force of 10N?
it will accelerate in the direction it is being pulled because unbalanced forces cause acceleration
the bigger the net force…
the smaller the mass…
the bigger the acceleration
netforce = ?
mass x acceleration
on a graph showing the acceleration of an object, what will a straight line of best fit through the origin mean?
force is directly proportional to acceleration
what is terminal velocity?
the constant speed an object eventually reaches when the resistance of the medium it is moving through prevents further acceleration
ie. a car moving through air eventually cannot go any faster because the air resistance will become equal to the maximum push of its engine
what is Hooke’s Law?
extension is directly proportional to force
what is the name of the point at which an object stops obeying Hooke’s Law?
The Elastic Limit
what is elastic behaviour?
when a stretching force is removed the object will return to its original length
what is plastic behaviour?
beyond the elastic limit the object is permanently stretched even when the object is removed
when is F = kx false?
when the elastic limit has been exceeded
what is the extension of two springs in series and why?
double a single spring extension
because each spring “sees” the applied force
what is the extension of two springs in parallel and why?
half the extension of a single spring
because the force is split between each spring
what is a moment?
the turning effect produced by a force
what does the size of a moment depend upon?
- how big the force is
2. how far away from the turning point the force is
