Forces and resultant forceIB MYP Sciences: Mind map

Exam questions on Forces and resultant force

1. A 60 kg astronaut prepares for a mission to the Moon. On Earth the gravitational field strength is 10 N/kg. On the Moon it is 1.6 N/kg.
   Calculate the astronaut's weight on the Moon.2 marks
2. A worker in a warehouse in Mumbai pushes a crate along a level floor with a horizontal force of 150 N. The friction force between the crate and the floor is 90 N.
   The worker now reduces the push until the crate moves at a constant speed. State the size of the push and explain why.2 marks
3. Mateo, a student in Mexico City, investigates how a spring stretches. He hangs the spring from a stand, adds masses to its lower end one at a time and measures the length of the spring with a metre rule after each mass is added. The spring is 10.0 cm long with no load. Its lengths are 12.0 cm with 100 g, 14.0 cm with 200 g, 16.1 cm with 300 g, 18.0 cm with 400 g and 20.0 cm with 500 g. Take g = 10 N/kg.
   State a testable hypothesis for this investigation, and identify the independent variable and the dependent variable.3 marks