the rest of physics

how does upthrust work

• when an object is submerged in fluids pressure of the fluid exerts a force on it from every direction

• pressure increases with depth, larger at bottom

• resultant force upwards

elasticity

• a force that stretches or compresses a spring does work, and e.p.e is stored in the spring, equal,

• extension of an elastic object is directly proportional to the force applied, provide limit of proportionality isn’t exceeded

levers

• allow a larger force to act upon the load then is supplied by the effort, so easier to move larger and heavier objects

high gear

• driving gear larger than driven gear

• high speed in driven

• lo turning moment in driven

• good for speeding up

low gear

• driving gear smaller than driven gear

• lo speed in driven gear

• high turning moment in driven gear

more upthrust

• object that’s less dense than fluid its paced in weighs less than the equivalent volume of fluid

• means it displaces a volume of fluid that’s equal to its eight before its completely submerged