Biomechanics

What are scalar quantities- distance and speed

Information needed to calculate acceleration- initial and final velocity and change and time.

What affects the time that a horizontally projected object remains in the air? projection height

What quantity is calculated as the inverse of speed? Pace

Neglecting the effect of air resistance what is true regarding the horizontal component of projectile velocity? Remains constant throughout flight

Distance and displacement 100 meter know the difference between the two

If acceleration is constant and positive, velocity is what?Increasing

Why do elite long jumpers have take-off angles far less than the optimal 45°? Take of velocity it higher at lower take off angles.

What influences the shape of a projectiles trajectory? Angle of projection and air resistance

Trajectory- flight path of projectile

Angular acceleration- rate of change in angular velocity

Radial acceleration- the component of angular acceleration directed toward the center of curvature.

Radian- unit of angular measure

Angular velocity- unit is Rad per second. Know the equation for this. W=q/t. rate of change in angular position.

Angular distance- scaler quantity

Right hand rule- procedure for identifying the direction of an angular motion vector.

Radius of rotation- v=rw r stands for radius of rotation  

Momentum- quantity of motion possessed by an object

What is radial acceleration directly affected by? Directly affected by tangential velocity and radius of rotation

Two variables that determine momentum- mass & velocity.

Which mechanical quantity is not dependent on time? Potential energy

Coefficient of restitution- number relating to the elasticity of a ball against a particular surface

Kinetic energy- the energy of motion

Mechanical power- mechanical quantity that is evident in explosive track and field events such as the long jump. Looking a explosive event/power

Unit of mechanical energy- Joules

When two bodies collide head-on and then continue to travel collectively in the original direction of motion of one of the bodies, what factor determines the direction of collective motion after the collision? The relative moments of the two bodies.

What is true of the amount of horizontal force required to start an object sitting on a horizontal surface in motion? Greater than the coefficient of static friction  

How does wearing gloves increase the friction between the hands and the bat? Meow the u looking thing s

A projectile is a body in free fall subject to only the forces of gravity and air resistance.

Projectile-

Gravity-

Air resistance-

Apex- the highest point in the trajectory of a projectile

Newton’s law of inertia/ conservation of momentum- inertia can be restated as the conservation of momentum

Clockwise in rotational motion- negative direction

Number serves a index of elasticity- is restitution

Short answer:

Define velocity and acceleration, include the formulas for each and explain the relationship between the two by providing examples.

Discuss the 3 mechanical factors that influence a projectile, including how a change in one will affect the others. Angle of projection, projection speed and relative height of projection. Explain more…

Explain tangential acceleration using an example in sport, danceor rehabilitation.

Provide 2 examples in sport, dance or rehabilitation where it is advantageous to increase friction and 2 examples where it is better to decrease friction, including methods used.