8 Flashcards
what is displacement
distance in a certain direction
does a scalar quantity depenend on direction
no- it keeps adding regardless
give an example of a scalar quantity
odometer on car
what is a vector quantity
a physical quantity that has magnitude and direction
what ways can forces change an object
shape and motion
what are the 2 ways forces can be catoregises
contanct and non-contact
what is a contact force
where the 2 forces must touch
what does newtons third law tell us
when we apply the a force the opposite force must also apply
what is the resultant force
is a single force that has the same effect as all the forces acting on an object
what is the momment of a force
the measure of the turning effect of the force of an object
what is the eqaution for momment
momment =force*perpendicualr distance from line
what does a low gear give
low speed and high turning effect
what does a high gear give
high speed and low turning effect
what is the centre of mass
the point at which its mass can be thought of as being concentrated
when an object is freely suspended where does it come to rest
its centre of mas directly underneath the point of suspension
