Flashcards in Topic five - forces Deck (17):
what is the difference between vectors and scalar quantities
vectors have a direction in association with them whereas scalar quantities do not
what are the two types of forces
contact and non-contact
how do you work out the distance from the pivot if you are not applying the force perpendicular to it.
you work out the perpendicular distance from the pivot i.e. continue along with the force until it is 90 degrees to the distance
how do you work out the pascals
newtons per metre squared
how do you work out the pressure in a liquid
the height of the column of liquid x the density of the liquid x the gravitational field strength
how do you work out the upthrust in water
the mass of the displaced water.
what is a typical walking speed
what is a typical running speed
what is a typical cycling speed
what is a typical car speed
what is a typical train speed
what is a typical plane speed
what is newton's first law of motion
if the resultant force on a stationary object is zero, the object will remain stationary. if the resultant force on a moving object is zero, it will just carry on moving at the same velocity.
what is newton's second law of motion
the acceleration of an object as produced by a net force is directly proportional to the magnitude of the force and inversely proportional to the mass.
what is newton's third law of motion
when two objects interact, the forces they exert on each other are equal and opposite.
what two main factors affect thinking distance
speed and your reaction time