Linear Kinetics 1 Flashcards
Projectile motion ^ vertical velocity = ?
^ Height, flight time, range
Projectile motion ^ horizontal velocity = ?
^ range
same height, flight time
Shot put optimal release angle and why
38-43 degrees because release height > landing height
Long jump maximum range (L1-3) explained
L1 & L3 = body position (take off/landing)
L2 (flight time) = velocity at take off
Long jump optimal release angle and why
15-22 degrees because centre of mass higher at take off than landing
Inertia definition
the resistance of a body to motion
Mass definition
amount of matter in a body (kg)
^ mass = ^ inertia
Force defintion
Causes motion (N - newtons)
Alters a body’s state of rest/uniform motion
1N = 1kg mass accelerated by 1m/s/s
Force explained
Force is a vector (mag + direction)
Point of application is important can be contact (eg in a joint) and non contact forces (gravity)
Newtons law of gravitation explained
Any 2 particles attract one another with directly proportion force to the product of their masses and inversely proportional to the square distance between them
F = m1m2 / d^2
Weight definition
Weight is attractive (gravitational) force that exerts on a body
Weight varies on location mass is constant
Newtons first law of motion explained
Every body is in a state of rest or uniform motion in a straight line unless compelled to change by external forces acting on it
Newtons second law of motion explained
Acceleration of a body is proportional to the force causing it and the change follows the direction the force acts
F = ma
Mass - Weight relationship example
Divers mass = 55kg
Force = weight (W)
f = ma = W = 55x -9.81 m/s = -539.6 N
Newtons 3rd law of motion explained
For every force that is exerted there is an equal and opposite force going the other way (action & reaction)
