Newtons First Law of Motion

Newtons First Law of MotionGalileos Law of InertiaWhen the ball was released, it tended to come within a few centimeters of the original height at the other endWhat would happen to the ball if it was released and allowed to roll without friction?

If there was no friction, then the ball would rise up to the same level (on the other side) from which it was dropped (see next slide)2Investigate

Galileos Law of InertiaWhat would happen if there was an infinite amount of room for the ball to roll (on a flat track)?

The ball will not stop if there is no unbalanced force to cause it to stop or change direction4VocabularyInertia the natural tendency of an object to remain at rest or to remain moving with constant speed in a straight lineForce a push or a pullNewtons First Law of MotionIsaac Newton used Galileos law of inertia as the basis for developing his law of motion

Newtons First Law of Motion is basically the same as Galileos Law of Inertia6Vocabulary(Newtons) First Law of Motion in the absence of an unbalanced force, an object at rest remains at rest, and an object already in motion remains in motion with constant speed in a straight line pathInertia the natural tendency of an object to remain at rest or to remain moving with constant speed in a straight lineForce a push or a pull

Newtons First Law of MotionObject at rest stays at restDoes this make sense?Object in motion stays in motionDoes this make sense?8VocabularyMass the amount of matter in an object; measured in grams (g); it is a measure of inertia(Newtons) First Law of Motion in the absence of an unbalanced force, an object at rest remains at rest, and an object already in motion remains in motion with constant speed in a straight line pathInertia the natural tendency of an object to remain at rest or to remain moving with constant speed in a straight lineForce a push or a pullHow does mass affect inertia?Newtons First Law of MotionAs the mass of an object increases, so does its inertia10Running StartsWhy do some athletes use running starts?ie. Javelin, pole vault

Running starts give athletes an opportunity to increase the final speed of what theyre launching. The speed of the runner is added to the speed of the launched object. 11VocabularySpeed the change in distance per unit of timeVelocity speed in a given directionAcceleration the change in velocity per unit of timeMass the amount of matter in an object; measured in grams (g); it is a measure of inertia(Newtons) First Law of Motion in the absence of an unbalanced force, an object at rest remains at rest, and an object already in motion remains in motion with constant speed in a straight line pathInertia the natural tendency of an object to remain at rest or to remain moving with constant speed in a straight lineForce a push or a pull

Frames of ReferenceWhy is the frame of reference important?relative toThe speed of an object is different depending on ones frame of reference (where one is). For example, a person is on a moving train (10 m/s), and that person is walking in the same direction as the moving train (2 m/s). To those inside the train, the person is moving at 2 m/s. To those outside of the train, that person is moving 12 m/s. 13Frames of Reference Videohttp://youtu.be/5oSrDrDLylwVocabularyFrame of Reference a vantage point with respect to which position and motion may be described; relative toSpeed the change in distance per unit of timeVelocity speed in a given directionAcceleration the change in velocity per unit of timeMass the amount of matter in an object; measured in grams (g); it is a measure of inertia(Newtons) First Law of Motion in the absence of an unbalanced force, an object at rest remains at rest, and an object already in motion remains in motion with constant speed in a straight line pathInertia the natural tendency of an object to remain at rest or to remain moving with constant speed in a straight lineForce a push or a pull

What Do You Think Now?How do figure skaters keep moving across the ice at high speeds for long times while seeming to expend no effort?Why does a soccer ball continue to roll across the field after it has been kicked?Figure skaters keep moving at high speeds while seemingly expending no effort because there is not much friction on the ice. In addition, once the skaters begin moving, they will not stop unless an unbalanced force stops them because they have inertia (Newtons First Law of Motion).The soccer ball continues to roll across the field after it has been kicked because it has inertia; therefore, it will keep moving unless acted on by an unbalanced forceThe skaters have more mass than the soccer ball, so they have more inertia than the soccer ball.16Claim and EvidenceClaim: Lake Superior has frozen over and become a frictionless surface. If I place a note in a frictionless container, it will slide all the way to Toronto to my long lost twin.Evidence: