Topic 1: Forces and Motion Flashcards
Newton’s First Law
balanced forces means there is so change in velocity
Newton’s Second Law
if there is an unbalanced force, the object will accelerate in that direction (resultant force)
Force, mass and acceleration equation
F = ma
Newton’s Third Law
if an object exerts a force on another object, then the other object exerts an equal and opposite force on the original object
What is Hooke’s law?
extension is proportional to force
When does Hooke’s law stop working?
at the elastic limit
What happens if you increase the force past the elastic limit?
the material will be permanently stretched
Momentum, mass and velocity equation
momentum = mass x velocity
Momentum is…
conserved
Force causes momentum to…
change
Force, momentum and time equation
force = change in momentum/ time
What is a crumple zone?
increases time taken for momentum to change
How do seat belts act as safety feature?
increase time taken for momentum to decrease - reduces impact/ force acting on passenger
