Pressure, moments and workIB MYP Sciences: Mind map

Exam questions on Pressure, moments and work

1. A camel in the Arabian desert has a weight of 6000 N. Each of its four wide feet has a contact area of 0.075 m² with the sand.
   A tourist weighing 750 N stands on the sand on both feet. The total contact area is 0.050 m². Calculate the pressure that the tourist exerts on the sand.2 marks
2. Amara and Ben sit on a see-saw, which is a uniform plank balanced on a pivot at its centre. Amara weighs 400 N and sits 1.5 m from the pivot. Ben weighs 500 N.
   Ben now moves to 1.5 m from the pivot. Explain what happens to the see-saw.2 marks
3. Sana, a student in Colombo, investigates the principle of moments using a uniform metre rule balanced on a pivot at its 50 cm mark. She hangs a 2.0 N weight 20 cm to the left of the pivot. She then hangs different weights on the right and slides each one along the rule until the rule balances horizontally. The balancing distances from the pivot are 40 cm for 1.0 N, 21 cm for 2.0 N, 10 cm for 4.0 N and 8 cm for 5.0 N.
   Describe how Sana should carry out the investigation so that her results are valid, including one safety precaution.3 marks