Push and Pull Objects PDF

Push and Pull Objects ESSENTIAL QUESTION How do forces move an object? This material is provided solely for individual educational use by licensed student users Start here As you read, underline evide...

Push and Pull Objects ESSENTIAL QUESTION How do forces move an object? This material is provided solely for individual educational use by licensed student users Start here As you read, underline evidence to answer the Essential Question. Pushes and Pulls Are Forces only and may not be further reproduced or distributed. How do you open a door? Sometimes you must push it. Other times, you pull. Pushes and pulls are forces. Many things move when they are pushed or pulled. Desk drawers, carts, and wagons are examples. When you push or pull something, you touch it. A touch is a form of contact. Pushes and pulls caused by touching are called contact forces. You use contact forces all of force force, forces, the time. forced, forcing An object’s movement is called motion. When you kick a motion motion, motions, motioned, soccer ball, you make it move. If someone else kicks the motioning ball, the ball’s motion changes. Every kick is a contact force. What is a force? A force (fórs) is a push or pull on an object. What is a contact force? A contact force (CON-tact fórs) Think About It: What do you is a force that requires things to touch. know about Morsa Images/Getty Images What is motion? Motion (MO-tion) is changing place forces? or position. Copyright © McGraw Hill 28 Science Literacy Essentials Push and Pull Objects This material is provided solely for individual educational use by licensed student users only and may not be further reproduced or distributed. Forces can be weak or strong. You need to use just a little force for some things, like picking up a pencil. You need to use a lot of force for some things, like picking up a bed! Look at the photo of the wagon. The children are pulling a wagon with a big dog in it. They are using a lot of Think About It: force, but it still looks hard to move. How could the If a third child children make it easier? They could add more force. If pulled the wagon, another child pushed from the back, they could put the what would wagon into motion more easily. happen? Sometimes a force does not change an object’s motion. If you pushed on a large tree, you would not be able to change its motion. The tree would push back at you without moving. A very strong force from a bulldozer would be needed to push over a tree. LWA/Getty Images  uick Check: If you were trying to move an empty splash pool, would Q you need help? What if the pool was full of water? Explain. Copyright © McGraw Hill Talk About It: How do forces affect the motion of a gyro wheel? Push and Pull Objects Science Literacy Essentials 29 Start here Read the title. Make connections to what you already know. Motion in the Park Read the Infographic: Forces make objects move. They put objects in motion. The motion of an object This material is provided solely for individual educational use by licensed student users changes its position. Position is where an object is. Trace with your finger where forces put objects The player zigzags to hit the ball. The in motion. tennis racket pushes the ball to the other only and may not be further reproduced or distributed. side of the court. The dog pulls the dog walker toward the tree. Think About It: Tell about a time you used a push or a pull while playing a game. Copyright © McGraw Hill The skateboarder pushes off the ground to move forward. 30 Science Literacy Essentials Push and Pull Objects  The player pushes the basketball off their fingertips toward to the basket. Think About It: This material is provided solely for individual educational use by licensed student users Are there other examples of pushes and pulls in this picture? only and may not be further reproduced or distributed. The climber pulls up to climb to the top. The adult pulls the child back on the swing. They push forward to make the child swing higher. Copyright © McGraw Hill Push and Pull Objects Science Literacy Essentials 31