Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Lorentz force wikipedia , lookup
Coriolis force wikipedia , lookup
Negative mass wikipedia , lookup
Equivalence principle wikipedia , lookup
Newton's law of universal gravitation wikipedia , lookup
Fictitious force wikipedia , lookup
Centrifugal force wikipedia , lookup
Artificial gravity wikipedia , lookup
Modified Newtonian dynamics wikipedia , lookup
Centripetal force wikipedia , lookup
Unit B, Chapter 3, Lesson 4 What is Newton’s Second Law of Motion? Mass, Force, and Acceleration • It is easier to push or pull an object with less mass than an object with greater mass. – For example: pushing an empty desk needs less force than a desk filled with textbooks. • Newton’s second law of motion states an object’s acceleration depends on the mass of the object and the size and direction of the force acting on it. Mass, Force, and Acceleration • Force =mass x acceleration – Force refers to the overall force given to an object. Mass is to the mass of the objects and acceleration to the objects change in velocity. • An object accelerates in the direction of the force that acts on them. Mass, Force, and Acceleration • The greater the force applied, the faster the object accelerates. When a weaker force is given, the object will move slower – For example…when you push a person on roller skates, they will move faster with a greater force applied. • When the acceleration of an object changes, the amount of force acting on the object also must be changing. Falling Objects • Aristotle, the Greek philosopher, claimed that the rate at which an object falls depended on its mass. – Galileo tested that theory by dropping two cannon balls at the same time. Aristotle's theory was wrong. • Two objects dropped with different masses, should hit the ground at the same time. • Mass has no control over the rate at which objects fall. Gravity pulls harder on the object with more mass, but inertia overpowers gravity. – The objects have the same amount of acceleration. Falling Objects • All falling objects have the same acceleration, unless air resistance affects them in some way. – When you drop a flat piece of paper, and a crumbled up paper, air resistance causes the flat piece of paper to fall slower. • Skydivers use streamlining. Streamlining allows someone or something to increase their acceleration – When you streamline an object, you give it the smallest possible surface area