Forces

anything that causes a body to accelerate

when there is no net force; cause an object to stay stationary or move at a constant velocity

cause an object to accelerate or change velocity

the larger force with a thicker arrow , think of balance and unbalanced

a force that opposes motion.

less slipping, make brakes work, slow down hailstones reducing damage

slows down moving bodies and wastes energy causes wearing of surfaces casues excessive heating and noise

oiling streamlining (making objects moving through air more aerodynamic) smoothing surfaces using wheels between surfaces

a measure of the force of attraction between two bodies with mass

the measure of the force of gravity acting on an object

weight = mass (kg) x g value ((use N unit for weight)

acceleration due to gravity; m s-2

retort stand, with a spiral spring attahced to the top and metre stick at the bottom, running alongside the retort stand vertically. pointer at the bottom of the spiral spring, note length. Add a slotted weight to the bottom of the spring, note the length and caluclate extension. Draw extension vs applied force graph. CONCLUSION: Hooke’s law.

The extension of a spiral spring is directly proportional to the applied force