An Atwood machine often used to demonstrate Newton’s first and second laws and the free fall apparatus is used to determine the gravitational acceleration.

Equipment list:

• The main frame made of Plexiglass, the lower part : a stand with 4 adjustment screws to level the apparatus and the upper part: a scaled rectangular with 1 mm resolution
• Mechanical key to release the mass
•  Two 100 gr stainless steel weights
•  Aluminum 8cm diameter pulley with the weight of 13.5 g
• Adjustable protector to prevent thread and mass falling
• Thread
• Horizontal leveling rods (up, down and middle)
• Electrical magnet to hold the bullet
• Two optical sensors
• Bench digital chronometer with DC 6V power source to feed the electrical magnet
• Weigh : 6.5 kg and dimensions : 165cm×40cm×40cm