iis “enrico mattei” san donato milanese physics course displacement–time equation of uniformly...
TRANSCRIPT
IIS “Enrico Mattei” San Donato Milanese
Physics course Displacement–time equationof uniformly accelerated linear motion
Teacher
Laura Scarpa
What happens when a car accelerates?
What happens when a car goes downhill?
We will study the mathematical relation between time and displacement.
Air track works on the principles of an air cushion
Air spreads out from the air vents and forms an air–cushion between the surface of the air track and the inner surface of a glider.
We need a constant force acting on the glider
To provide a constant force we will incline the track at a precise amount.
a=g*h LL L a
The time measurement is taken by the two photo-gates placed over the air track
The glider triggers the timer passing through the gates.
S(m)
T(s)
K (m/ s2)
K average
(m/ s2)
0,000 0,000 / 0,100 0,925 0,117 0,0970,200 1,373 0,106 0,300 1,736 0,100 0,400 2,036 0,096 0,500 2,276 0,097 0,600 2,567 0,091 0,700 2,818 0,088 0,800 3,030 0,087 0,900 3,214 0,087
Experimental results
K=s/t2
K =s/t2
But what about the value of the constant K?
a=g*h LL
Let ’s compare the two values.
K = 0,097 m/s2
g=9,8 m/s2 h=3,2 cm L= 162 cm
a = 0,194 m/s2
K= 1 a 2