Physics Of Sport

Question 1

Impulse equation

Answer 1

Ft = mv-mu

Question 2

Coefficient of restitution

Answer 2

Relative speed after collision
——‐——————————-
Relative speed before collision
Vb - Va / Ua - Ub

Question 3

Coefficient of restitution with height

Answer 3

E = Square root of h / H
H = initial height of object

Question 4

Moment of Inertia equation

Answer 4

2/3 or 2/5 mr²

Question 5

Angular acceleration equation

Answer 5

a = w2 - w1 / t

Question 6

Torque equation

Answer 6

T = inertia x angular acceleration

Question 7

Angular momentum

Answer 7

L = inertia x angular velocity

Question 8

Angular KE

Answer 8

KE = ½ x inertia x (angular velocity)²

Question 9

Air pressure equation w bernoullis principle

Answer 9

P = P⁰ - 0.5 x p x v²
p = density of air
V = velocity of object
P = pressure created

Question 10

Drag force equation

Answer 10

Fd = ½ x p x v² x A x Cd
Cd = drag coefficient
A = area of object

Question 11

What are the two elements to mention when asking about when lift occurs

Answer 11

Newton’s third laws
Bernoullis principle

Question 12

What is bernoullis principle

Answer 12

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

Question 13

What do you need to consider when there is a question on projectile motion

Answer 13

Both horizontal and vertical components of vectors like the velocities

Question 14

Which direction is the lift force to the direction of motion

Answer 14

Perpendicular

Question 15

What is a moment

Answer 15

Force x perpendicular distance from point of rotation

Question 16

What is a couple

Answer 16

A pair of forces acting in opposite directions on a body with different lines of action

Question 17

What does it mean to be in equilibrium

Answer 17

Total moments equal 0
Resultant force equals 0

Question 18

What is the center of gravity

Answer 18

The point at which weight acts on or outside of the object

Question 19

How do you increase the stability of an object

Answer 19

Give it a wider base

Question 20

What is the moment of inertia?

Answer 20

A measure of how difficult it is to alter an objects rotational speed

Question 21

What factors effect the moment of inertia

Answer 21

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

Question 22

What is torque

Answer 22

A measure of how much a force causes an object to rotate about an axis

Question 23

Work done equation

Answer 23

torque x angular displacement

Question 24

power in a rotating object

Answer 24

torque x angular velocity

Question 25

what is the difference between elastic and inelastic collision

Answer 25

elastic = all kinetic energy conserved
inelastic = kinetic energy was disapated into other forms

Question 26

When lifting a weight if the angle of extension increases then what happens to the moments and the force on the arm

Answer 26

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*