![]() Making Science Accessible: A Guide for Teaching Introductory Physics to Students Who Are Blind or Visually Impaired by Michele Engelbrecht and Kate Fraser. Parsippany, NJ: Globe Fearon Inc., Pearson Learning Group, 2009, pages 280 to 281. (Grades 6-8)Īrticle and activity adapted from Concepts and Challenges: Physical Science, Fourth Edition. PS2.A: Forces and motion: The role of the mass of an object must be qualitatively accounted for in any change of motion due to the application of a force.Which is the action force? Which is the reaction force? At the same time, the ground pushes against your feet. When you walk, your feet push against the ground.With what force is the object pushing on the table? With what force is the table pushing on the object? An object resting on a table weighs 100 N.Action forces and reaction forces always act on _ objects. ![]() In a rocket engine, the _ force pushes the rocket upward.How are action and reaction forces different?.For every action force, there is an equal and _ reaction force.What effect would blowing more air into a balloon have on the motion of the balloon when released?.If a book is sitting on a table, is the table exerting a force? If so in what direction?.Let go of the balloon and it will take off like a rocket.Have someone hold the balloon under the straw and tape the balloon to the straw in two places.Blow up the balloon and hold it so that no air can escape but don’t tie it.Tie the string to stationary objects on opposite sides of the room.Feed one end of the string through the straw.The gases exert an equal and opposite force on the rocket itself. These gases expand rapidly and are forced out of the back of the rocket. When rocket fuel is burned, hot gases are produced. The action of the air rushing from the balloon pushes against the balloon, moving it in the opposite direction. The air rushes out of the neck of the balloon. When the neck of an inflated balloon is released, the stretched rubber material pushes against the air in the balloon. Newton’s third law explains how balloons and rocket engines work. Every time your feet hit the ground when you are running, the ground hits your feet with an equal and opposite force. The more force you use to a hit a tennis ball, the more reaction force your arm receives from the racket. Newton’s third law explains how many sports injuries are caused. The ball exerts an equal and opposite force on the racket. ![]() The law states that for every action force, there is an equal and opposite reaction force. Newton’s third law of motion describes action and reaction forces. Notice that the two forces act on different objects. ![]() This reaction force will cause the rolling chair to move backwards. Now, the desk pushes back against the person with a force of the same size. When the person sitting in a rolling chair pushes on the desk, this push or force is the action force. Imagine a person sitting in a rolling chair at a desk. When you push on an object, the object pushes back with an equal force. The two forces act in opposite directions. Reaction force – force acting in the opposite direction Action and Reactionįorces always act in pairs. Action force – force acting in one direction If in a latex-free school, use mylar balloons. *NOTE: Balloons should NOT be used by students with latex allergies. The whole class will want to do this activity again and again. Also beneficial is an opportunity to be at the end when the balloon rocket arrives. The student with a visual impairment can best experience the activity as the person who has a chance to release the balloon*. The activity described below works well for all students.
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