jasmine
what is the force between 2 objects that are sliding or trying to slide oast eachother?
friction
The force that acts in the opposite direction to an object's movement as it moves through the air.
air resistance
The force that supports an object on a solid surface
reaction
- The force transmitted through a rope, string or wire when pulled by forces acting on each end.
tension
- The upward force exerted by a fluid on an object floating in it.
upthrust
The force acting on an object due to gravity.
gravitational force
The force exerted by a magnetic field on a magnetic material.
magnetic force
The force that acts between two charged objects.
electrostatic force
how and what do you measure force in??
you measure in newton meter and measure in newtons
forces always act in...
pairs
As an object gets farther away from the object exerting a force...
the field gets weaker
can you see forces??
no but you can see their effects
the longer force arrow on a diargram shows..
the bigger force although the smaller one is the smaller force
do the force arrows always touch the object in the diagram?
yes
does the moon have a bigger or smaller gravitational field strength than the earth??
smaller
would an object or person weigh the same on the moon?
no they would weigh less, although their mass will stay the same
what is mass?
the amount of matter an object is made up of
what is mass weighed in?
kilograms
what is weight?
the total amount of force acting upon an object due to gravity
what is weight measured in?
newtons
what is the equation to calculate weight?
weight= mass x gravitational field strength
how to reduce friction?
use oil or have a smaller surface area
speed
how fast something is travelling at a certain time
speed eauation
speed(m/s) = distance/time
accelaration
an increase in soeed
does oxygen diffuse in or out of the blood?
oxygen diffuses in, carbon dioxide diffuses out
why are alveolis good for gaseous exchange?
large surface area and thin walls