Driving force
Speed increases
Frictional force increases
Balanced
constant / steady speed
The forces should be unbalanced for
the car to change motion
Engine of the car
streamline shape of the car
Reaction force upwards and
weight downwards
Force A is the weight
Force B is air resistance or drag
No, weight will not change
Force B increases with the surface area then to
be balanced with weight
Force B [air resistance]
Her speed will decrease after she opens the parachute
downwards
reaction force or contact force
upwards
35N
f
a
c
e
g
h
b
d
oxygen
air
carbon dioxide
gas exchange
blood
energy
O2
to heart, for aerobic respiration
CO2
it is a product of body cell's aerobic respipration
Diffusion
Large surface area of the alveoli
Full of blood capillaries for blood supply
Thin and moist walls
As the carbon dioxide is more inside the cell than outside
so diffusionmoves from high concentration to low
concentration
cell membrane
Oxygen molecules will move into the cell as the
molecules of the oxygenwill move from high
concentration outside the cell into low-concentration
inside the cell by diffusion so the cells make aerobic
respiration.
A mixture made of different types of elements
[atoms] that are not chemicallybonded.
Mixture is easily to be separated as the
elements are not chemicallybonded but the
compound is made of different elements
that are chemically
solvent
solution
solute
insoluble
saturated
solubilty