Question

T or f

6) Two of the most important, controllable factors for achieving great vertical distance with a projectile are vertical velocity and a 90 degree projection angle

. 7) Projection angle is an important component for maximum horizontal projection because it increases the time the object is in the air.

8) It is possible for a high jumper using the flop technique to cross the bar with her center of gravity located beneath the bar.

9) A hook or slice in golf is caused by the Magnus Effect.

10) Water is a great rehabilitation medium because it provides both resistance through drag and lift through attack angle.

Answer 1

6) True,

Maximum vertical height formula is,

so, maximum vertical velocity and angle projection angle of 90 degree gives maximum vertical height.

7) True,

Horizontal projection or range of projection is given by,

an angle of 45 degree gives maximum range.

8) True,

It is a technique called Fosbury flop . where the center of mass of the body lie beneath the bar while crossing the bar. At no time during the jump does the center of gravity actually reach the level of the bar. This is an o advantage over the straddle because in effect the person does not have to jump as high. In terms of energy he uses less kinetic energy on takeoff because he needs less maximum potential energy to clear the bar compared to a straddle.

9) True,

A slice or a hook is caused by the rotation of the ball on its vertical axis. this creates pressure difference below and above the ball and results in a curvy trajectory. this phenomenon is called Magnus effect

10) True

Water is a great rehabilitation medium because it provides both resistance through drag and lift through attack angle. the resistance created by an object passing through water provides aerodynamic force, lift or drag.