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point B point A The same force that causes an apple to fall to the ground also moves the planets. The moon revolves around the Earth because of the gravitational force between them. Newton’s Law of Gravitation Newton’s Law of Gravitation The pins don’t move until the ball hits them. Marbles exert equal force on each other. Both marbles change velocity and direction. Isaac Newton (1642-1727) Sir Isaac Newton is regarded as one of the greatest scientists and mathematicians in history. He used mathematics to develop the laws of motion and gravity. Newton wrote his most famous book Principia Mathematica in which he described and explained the three basic laws that rule the way objects move. Motion is the process of an object changing its place or its position. Speed is a measure of how fast an object is moving. 5 10 15 20 25 30 35 40 45 50 55 Force is a push or a pull upon an object. Newton's Theory of Gravity All objects in the universe apply a gravitational force (force of attraction) on other objects. The strength of the gravitational force is dependent upon the mass of the objects and the distance between them. The larger the mass of the objects, the larger the force is between the two objects. The farther away the two objects are, the weaker the gravitational force is between them. Earth’s gravity pulls all objects toward its center. Newton's Theory of Gravity All objects in the universe apply a gravitational force (force of attraction) on other objects. The strength of the gravitational force is dependent upon the mass of the objects and the distance between them. The larger the mass of the objects, the larger is the force between the two objects. The farther away the two objects are, the weaker the gravitational force is between them. Earth’s gravity pulls all objects toward its center. An object at rest tends to stay at rest and an object in motion tends to stay in motion at the same speed and in the same direction unless a force acts on it. Example: A bowling pin standing on a flat surface will remain at rest, unless a force such as a bowling ball causes it to move. Acceleration is produced when a force acts on an object. Acceleration of an object depends on its mass and the amount of force applied. Example: The same force applied on the larger ball produces a correspondingly smaller acceleration. For every action there is an equal and opposite reaction. Example: When 2 marbles collide, they apply force on each other. The force applied causes both marbles to change their speed and direction. The lighter ball will travel farther faster. 1 2 3 Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion © Copyright NewPath Learning. All Rights Reserved. 94-4509 www.newpathlearning.com Newton’s Laws of Motion similar size similar force larger mass larger force larger distance weaker force

Describe Newton’s First Law of Motion. __________________________________________ __________________________________________ __________________________________________ Describe Newton’s Second Law of Motion. __________________________________________ __________________________________________ __________________________________________ Describe Newton’s Third Law of Motion. __________________________________________ __________________________________________ __________________________________________ © Copyright NewPath Learning. All Rights Reserved. 94-4509 www.newpathlearning.com Newton’s Laws of Motion Provide an example of Newton’s First Law of Motion. ____________________________________________________________________________________ Provide an example of Newton’s Second Law of Motion. ____________________________________________________________________________________ Provide an example of Newton’s Third Law of Motion. ____________________________________________________________________________________ 5 10 15 20 25 30 35 40 45 50 55 is the process of an object changing its place or its position. is a measure of how fast an object is moving. is a push or a pull upon an object. point B point A Isaac Newton (1642-1727) Who is Isaac Newton? ______________________ ______________________ ______________________ ______________________ ______________________ ______________________ ___________________ Newton’s Law of Gravitation What is Earth’s gravity? _________________________________ _____________________________________________________ Describe Newton's Theory of Gravity. _____________________ _____________________________________________________ • acceleration • action • force • gravity • mass • motion • reaction • speed Vocabulary Terms 1 Newton’s First Law of Motion 2 Newton’s Second Law of Motion 3 Newton’s Third Law of Motion \|xiBAHBDy01738nzW How does the Moon revolve around the Earth? ________________________ ________________________ ________________________