Physics

Question 1

Acceleration

Answer 1

Acceleration = velocity / time. Acceleration is how fast something speeds up or
slows down.

Question 2

Biomechanics

Answer 2

Biomechanics is the study of how the body moves and the action of external and
internal forces on the body.

Question 3

Drag

Answer 3

Drag is a negative force that resists motion.

Question 4

Force

Answer 4

Force = mass x acceleration. Force is a push or a pull.

Question 5

Friction

Answer 5

Friction is the force that resists the relative motion of surfaces sliding against
each other.

Question 6

Gravity

Answer 6

Gravity is the force that attracts an object toward the center of the earth, or
toward another physical body that has mass.

Question 7

Mass

Answer 7

Mass is the quantity of inertia in an object, or the proportion between force and
acceleration.

Question 8

Power

Answer 8

Power = work / time. Power is the rate of doing work, and is measured in watts.

Question 9

Propulsion

Answer 9

Propulsion is a positive force that causes motion.

Question 10

Speed

Answer 10

Speed refers to how fast an object is moving.

Question 11

Velocity

Answer 11

Velocity is the rate at which an object changes its position.

Question 12

Weight

Answer 12

Weight = gravity x mass. Weight is a force that measures an object’s
gravitational attraction to the earth or another object.

Question 13

Watt

Answer 13

Watts are units of power in joules per second.

Question 14

Hydrodynamics

Answer 14

Certain forces are specifically related to movement in water: drag, lift, gravity and buoyancy. The study of these forces is known as hydrodynamics.

Lift - The flow of fluid over the surface of a body creates force. There is a component of this force that is perpendicular to the oncoming flow direction, and that is known as lift. In the early stages of the stroke, the hand moves diagonally, generating lift.

Buoyancy - Fluid exerts an upward force that opposes the weight of an immersed object. This is known as buoyancy. Buoyancy is what allows a swimmer to float.

Question 15

Forces at play - Cycling

Answer 15

Aerodynamic Drag
Gravity
Rolling Resistance
Acceleration

Question 16

Economy Movement

Answer 16

When the forces produced by the body are large enough and moving in the correct direction to overcome external forces acting to hold the body in place, movement is produced.
This is a tug-of-war that the muscles must constantly fight if an athlete is to keep moving forward.
The amount of energy, or ATP, required to overcome these forces is an important concern for endurance athletes who have a limited amount of stored energy.
To reduce unnecessary energy expenditure, athletes should strive for movement economy.