levers

levers

all human skeletal movements occur in circles or part circles

force defintion

a push or a pull the alters a state of motion of a body

inertia definition

the resistance of a body to change its state of motion whether at rest or while moving

velocity definition

the rate of change in displacement

momentum definition

the quantity of motion possessed by a moving body

acceleration

the rate of change in velocity

newtons first law

law of inertia

a body continues in a state of rest or uniform velocity unless acted upon by an external or unbalanced force

no force = no movement

force applied = movement will occur

newtons first law example

a 100m sprint will remain on the blocks until a large external force is applied, large enough to overcome their inertia creating motion

newtons second law

law of acceleration

a body’s rate of change in momentum is proportional to the size of the force applied and acts in the same direction as the force applied

* the harder you push the faster you will go

the bigger the force = the harder the acceleration

newtons second law example

if you put more force/watts onto the footplate you will go faster

newtons third law

the law of reaction

for every force applied to a body there is an equal and opposite reaction force

newtons third law example

if you take a stroke on your left blade you will turn right

if you jump off you right foot to the side, you will go left

net force definition

the sum of all forces acting on a body, also termed resultant force

balanced forces