Physics Of Sport Flashcards
Impulse equation
Ft = mv-mu
Coefficient of restitution
Relative speed after collision
——‐——————————-
Relative speed before collision
Vb - Va / Ua - Ub
Coefficient of restitution with height
E = Square root of h / H
H = initial height of object
Moment of Inertia equation
2/3 or 2/5 mr²
Angular acceleration equation
a = w2 - w1 / t
Torque equation
T = inertia x angular acceleration
Angular momentum
L = inertia x angular velocity
Angular KE
KE = ½ x inertia x (angular velocity)²
Air pressure equation w bernoullis principle
P = P⁰ - 0.5 x p x v²
p = density of air
V = velocity of object
P = pressure created
Drag force equation
Fd = ½ x p x v² x A x Cd
Cd = drag coefficient
A = area of object
What are the two elements to mention when asking about when lift occurs
Newton’s third laws
Bernoullis principle
What is bernoullis principle
As an object travels through the air, the air gets accelerated over the wing. The fast air on top creates a low pressure and the slower air underneath creates a high pressure. The difference in pressure is what creates lift
What do you need to consider when there is a question on projectile motion
Both horizontal and vertical components of vectors like the velocities
Which direction is the lift force to the direction of motion
Perpendicular
What is a moment
Force x perpendicular distance from point of rotation
What is a couple
A pair of forces acting in opposite directions on a body with different lines of action
What does it mean to be in equilibrium
Total moments equal 0
Resultant force equals 0
What is the center of gravity
The point at which weight acts on or outside of the object
How do you increase the stability of an object
Give it a wider base
What is the moment of inertia?
A measure of how difficult it is to alter an objects rotational speed
What factors effect the moment of inertia
The mass
The mass distribution of the object
The position of the axis of the rotation and how far away from the mass it is
What is torque
A measure of how much a force causes an object to rotate about an axis
Work done equation
torque x angular displacement
power in a rotating object
torque x angular velocity
what is the difference between elastic and inelastic collision
elastic = all kinetic energy conserved
inelastic = kinetic energy was disapated into other forms
When lifting a weight if the angle of extension increases then what happens to the moments and the force on the arm
As the arm stays in equillibrium then the total moments are the same / equal to each other
The force will increase because it is proportional to the inverse of cos*
