Ch+2+Sec+1+KirnumB

=Chapter 2 Physics In Action= toc

Section 1
[|Sport Science of Happy Gilmore] This video shows the physics that is related to the "Happy Gilmore" golf swing. Though this "investigation," physicists prove that the "Happy Gilmore" provides a further swing then an average swing. This is true because the golfer gets a running start and has more momentum as he or she hits the ball. This swing results in the ball traveling 30 yards farther then it normally would.

What Do You Think? I think figure skaters keep moving on the ice at high speeds by making little movements with their feet that will push them forwards. They gain the high speed and continue to travel at that speed because there is no force slowing you down. A soccer ball continues to roll because of the force that was put on it, the greater the force the farther it moves.

Investigate Prediction: The steeper the slope it is released on, the further it will travel 1 c) 5.37 m e) 5.37 m 2 a) It will be more then the last time. b) There is less friction from the slope 3 a) 6.12 m, my predication is not correct they are equal. b) 6.12 4 a) They will get higher. b) I was not correct, they were equal. 5 a) No b) 6.12 m c) Force from the previous slope d) He stops 6 a) It grows. b) It stays the same. c) They are equal d) Yes

Physics Talk

Galileo Galilei Newton's First Law of Motion Frames of Reference
 * Italian physicist, mathematician, astronomer, and philosopher
 * he introduced experimental science to the world
 * he concluded that a ball would continue its motion on the horizontal surface with constant speed along a straight line forever
 * From this, he formed the law of __//inertia://__ the natural tendency of an object to remain at res or to remain moving with constant speed in a straight line
 * __inertia__= Property of matter that resists changes in motion
 * to measure it, you measure the mass (kg)
 * Velocity: has direction
 * Speed: only has how fast
 * Acceleration: change in speed, direction, or both
 * how fast your velocity is changing
 * __//Force://__ a push or pull
 * Newton used Galileo's law of inertia as the basis for developing his //__First Law of Motion__ : in the absence of an unbalanced force, an object at rest remains at rest, and an object in motion remains in motion with constant speed in a straight line path //
 * // He also explained that __mass__ is a measure of its inertia (tendency to resist a change in motion) //
 * // d has the greatest mass therefore it has the most inertia //
 * // If you are moving, at 1m/s, on a train which is moving at 8m/s you are moving at a rate of 9m/s //
 * // speed has to be described in relation to something else //
 * __Running starts__: increases distance or speed to give advantage
 * "relative to" adding or subtracting

Checking Up


 * 1) Inertia is he natural tendency of an object to remain at rest or to remain moving with constant speed in a straight line
 * 2) Newton's law of motion is // in the absence of an unbalanced force, an object at rest remains at rest, and an object in motion remains in motion with constant speed in a straight line path. //
 * 3) A force (friction) is needed to act on an object to stop it from moving at a constant speed.
 * 4) The ball is stopped by friction.
 * 5) The one with the greatest mass has the most inertia.
 * 6) If you are getting the speed in reference to the train, it is just the speed of the ball, if you are getting the reference from the ground it has both the speed of the ball and the train.

PTG 1. a. It will roll as far as it takes to reach the hight at which it is dropped. b. It shows that if if there is no friction, the ball will continue rolling until there is a force acting against the ball. 2. 20 cm 3. No, on Earth, there are always forces acting upon objects in motion (gravity) and there isn't an infinite distance that it can travel. 4. Once the puck hits something else, a force interrupts its motion and causes it to change its speed and direction. 10. Three examples
 * Bowling, a ball will roll but the force of friction and the force of hitting the pins slow it down and change its direction.
 * Soccer balls will roll until enough friction acts upon them to even out the pressure that was forced upon it
 * Basket balls will go through the air until the gravity acting on the ball is stronger then the pressure that is acting on the ball



What do you think now? Ice skaters keep moving across the ice at high speeds because "an object in motion will stay in motion" until another force (friction from the ice) acts upon it. Soccer balls roll across the field after it has been kicked because it was put in motion and it needs to stay in motion until a force (friction) acts upon it.

Both of these, if they were compared to a ball rolling along a horizontal track, will have speed distance determined by the friction, the more friction, the faster they slow down

Reflecting on the Chapter Challenge "an object at rest remains at rest" an object in motion will stay in motion until an external force stops it video 1

video 2

video 3

Inquiring Further Curling [|Source]
 * It can be used to illustrate Newton's law because the point of the game is to make the ice smooth so there isn't very much friction. By doing this, they are keeping the curling stone in motion by having the least amount of friction act upon it.