Sorority Initiation Paddling

The study of motion

We made our travel cars after drawing lines on the floor 1 m apart from each other and providing observers along the route with the task of recording the transit time.
Only two cars followed a straight path . All but one - who has bumped into the cupboard - they stopped prima di raggiungere il traguardo fissato dall'ultima linea.
Abbiamo diviso lo spazio percorso per il tempo impiegato a percorrerlo ottenendo la velocità in m/s. La velocità finale era nulla (automobiline ferme). Dunque la situazione che abbiamo studiato era caratterizzata da una certa velocità iniziale e da una finale nulla.
E' l' attrito che si oppone al moto ed arresta la corsa. In assenza di attrito, e senza ostacoli frapposti, i corpi continuerebbero la loro corsa.
L'attrito (che è una forza che sempre si accompagna al moto) è però necessario: se vogliamo camminare, se vogliamo che le nostre auto si muovano, i piedi devono fare presa on the ground, the tires on the road. Otherwise I would have the same situation that you have on the ice or in the sand is slipping or the wheels spin freely.
measuring the distance in meters and time in seconds, the speed is expressed in m / s; to transform m / s in km / h note that 1m = 0.001 km = (1 / 1000) and 1 km s = (1 / 3600) h. Calculating (1 / 1000) / (1 / 3600) I find 3.6. So a speed of 42 m / s = 42x3, 6 = 151.2 km / h.
If the speed increases or decreases in a certain amount of time you have an 'acceleration . Try this

animation :
- first reset
- ask a = 0 (acceleration nothing)
- fixed v = 2 m / s shares

When x = 0 reaches the car with you this situation, where the first space-time graph, the second speed-time, the third acceleration-time



If v = 2 m / s after 2m 1s will have traveled, after 2 s, 4 m, after 10 s, 20 m (and arrived at x = 0). The space takes on the values \u200b\u200b0, 2, 4, 20 m for time t = 0, 1, 2, 10 seconds. I get the chart and the leftmost image above. Since v is constant (v = 2 m / s), the graph as a function of time is a straight line parallel to x (remember analytical geometry!), The table would be:

t 1 2 3 4 ... (X axis)
v 2 2 2 2 2 (y axis)

The acceleration is zero by assumption.

Other beautiful animation: The Moving Man The Ladybug and 2D . In the sidebar of the blog IN ITALIAN instructions to download and play offline. This
game makes you understand the role of position, velocity and acceleration: Reach the goal without collisions in the shortest possible time. It 's easy if you act on the position, the less easy if you act fast!