# danvan13's Blog

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## Why is the face of a golf driver curved?

When the club head hits the ball the club head is rotating around the center of gravity axis which is in the middle of the club. When the head rotates and hits the ball the gear effect comes into play. The gear effect is thinking of the golf ball as one gear and the face of the driver as another gear. So as you hit the ball if you catch it on the toe then the ball will slice and have side spin moving to the right of the hole and if on the heel of the driver you will hook it so the ball curves to

## Why dimples on a golf ball?

Why do golf balls have dimples in them? Dimples in the golf ball cause it to fly further than a smooth ball. When hit the smooth ball will not generate enough lift to go far. The shape when hit will be a parabolic shape. Dimples in a golf ball even tho the dimples cause drag it is not enough to hurt the flight of the ball. With the dimples impressed on the golf ball, the ball will generate more lift than a smooth one. When hit the magnus lift, force on the golf ball cause it to curve slightly up

## Stopping a shot

During soccer season I have had to stop all kinds of shots from m team and other teams as well. The physics behind stopping a shot is the force of which you apply to the ball. Newtons 3rd law states that forces come in pairs and that for every force there is and equal force acting against it. In this case force 1 would be the soccer ball hurling at me and the force that would be acting against it once it hits me would be my hands. So the force that I apply to the ball has to be equal to the

## Speakers

The physics behind speakers is quite amazing. The speaker consits of 3 parts. The cone, The coil, and the permenant magnet. The electro coil will recive a pluse of electricty and that will make it be drawn to the permenant magnet and will make the cone vibrate which sends vibrations into the air which the ear will recive.

## Sonic Boom

Sonic boom that is produced by an aircraft or other object flying at a speed equal to or exceeding the speed of sound(331 m/s) and that is heard on the ground as a sound like a clap of thunder. When a plane or other aircraft travels at subsonic speed, the pressure disturbances, or sounds, that it generates extend in all directions. Thus why you get the cone that flows around the aircraft. The intensity of the sonic boom is determined not only by the distance between the craft and the ground but

## Sonar waves

Sonar is an acoustic wave (whose uses are roughly analogous to radar) and whose name is an acronym for "sound navigation and ranging." Sonar consists of pulses of sound waves are transmitted into water, usually at ultrasonic frequencies in the range of 20-100 kHz. They travel out and are reflected by a solid object. The reflected signals are detected and then correlated to give the operator an indication of the distance and bearing of the object. There are some fundamental differences to note b

## Snow ball and Force

We all know when we throw a snowball we apply a force to it and when it hits somthing that other object is applying the same force that the snowball applied to it. So if Seth throws a snowball at Joe and it hits Joe in the face. Joe's face applied a force to the snowball and the snowball applied the same force to Joe's face.