equation 4

equation 3

the motion lab---walking graphs

Graph 1:

start at 1 meter away from the sensor and rest for 1 second, and then speed up, walk in positive direction  constant speed for 2 seconds. and then stop for  3 seconds, and then walk in negative direction constant speed for 1.5 seconds, and the graph is done.

Graph 2:

start 3 meters away from the sensor and walk in negative direction constant speed for 3 seconds, and then rest for 1 second and continue walk in negative direction constant speed for 1 second and then rest for 2 seconds and then walk in positive direction constant speed.

Graph 3:

Walk constant speed, run, keep the same speed, slow down and walk constant speed, walk very slowly and walk constant speed.

Graph 4:

 speed up for 4 seconds away from the origion, and then walking for 2 seconds at 0.5m/s away from the origion. slowing down for 0.15 seconds then stopping. then speed up for 0.15s towards the origion. and then walking for 3 seconds at 0.375m/s towards the origion. speed up for 0.1s towards the origion. rest for 0.9s.

Graph 5:

Starts at almost 1 meter from the origion and walk to the positive direction constant speed 1meter for 3 and half seconds, and then rest for 3 seconds and then walk fast to the positive direction in constant speed. 

Graph 6:

Walk at the constant speed for 3 sec at 0.375m. slow down and keep the same speed for 3 seconds, and little bit faster and keep the same speed.



the motor

     Our task for “Building an electric motor” this project was to build an electric motor and make the commutator spin. This simple motor was basically made of materials such as cork, wires, wood, thumbtack nails, and aluminum pieces. Firstly, we hammered the four nails into the wood, the distance between them was 5cm×3cm, and we bent two paper clips and placed each of them at the edges of the nails, the paper clips are used for holding the commutator. Secondly, we started to make our commutator. We firstly made the Axel went though the cork, the commutator involves two pins placed into the centre of the cross-section of the cork, and then we sanded the end of two side of the copper wire and wrapped the wire around one of the commutator pins around the cork until there was only a little bit of the wire left to wrap around the other commutator pin. The next is the brushes; we used two pieces of pop can instead of the metal brushes. We sanded both sides of the pop can pieces to remove its “insulation”, and we placed it between the paper clip holders and the nails. Thirdly we put our commutator upon the paper clip holders, and make sure the pins touch the brushes when it spins. Finally, we put 2 magnets, one on each side, and connect the power supply to make the motor spin.