1 What Are Pushes and Pulls?

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1 What Are? Each of the actions in the box below is a push, a pull, or both! Write each letter in the correct space in the Venn diagram. The first one has been done for you. Actions A. Dragging a chair
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1 What Are? Each of the actions in the box below is a push, a pull, or both! Write each letter in the correct space in the Venn diagram. The first one has been done for you. Actions A. Dragging a chair B. Rowing a boat C. Pressing a lift button D. Typing on a computer keyboard E. Sweeping the floor F. Combing your hair Push Pull A Science SMART Teacher s Guide Grade 3 395 2 What Is a Force? Rita rolls a ball along the ground. An X is drawn at the position where the ball stops. Left Right a. If Rita rolls the ball with more force, where would the ball stop? b. Tom is now standing at position X. He wants to roll the ball towards Rita. Should Tom exert a force to the left or to the right as shown in the picture? 396 Additional Teacher s Resources 3 What Are the Effects of Forces? Below are some statements about the effects of forces. Write True or False in the box beside each statement. Statements True/False i. Forces can be seen. ii. The effects of a force can be seen and felt. iii. A push is a force that brings an object nearer to us. iv. To move an object, a force must be applied. v. A force can change an object s speed. vi. A force cannot change an object s size. Science SMART Teacher s Guide Grade 3 397 Fun and Games Circle Me Out! Look at the picture below and observe what Smarty, Min, Ari, Rita and Tom are doing. a. Circle in blue those applying only a pushing force. b. Circle in red those applying only a pulling force. c. Circle in green those applying both a pushing and pulling force. 398 Additional Teacher s Resources Name: Class: Date: Exam Practice Process skills: Observing, Analysing, Inferring Tom and Ari have two similar plasticine balls. Tom is trying to stretch his plasticine ball, while Ari is trying to flatten his. Tom s plasticine ball Ari s plasticine ball a. In the pictures above, draw arrows to show the direction of the forces exerted by Tom and Ari. [2 marks] b. What types of force are Tom and Ari using? Tom: [1 mark] Ari: [1 mark] c. What can we conclude from this activity about the effect of forces? [2 marks] Hint: What change have the forces caused to the plasticine balls? Science SMART Teacher s Guide Grade 3 399 Chapter 6 Answers to Additional Teacher s Resources Answers to Additional Teacher s Resources 1 2 What Are? What Is a Force? Each of the actions in the box below is a push, a pull, or both! Write each letter in the correct space in the Venn diagram. The first one has been done for you. Rita rolls a ball along the ground. An X is drawn at the position where the ball stops. Actions A. Dragging a chair B. Rowing a boat C. Pressing a lift button D. Typing on a computer keyboard E. Sweeping the floor F. Combing your hair Left Right Push Pull a. If Rita rolls the ball with more force, where would the ball stop? The ball would stop after the X / on the right of the X. C B A b. Tom is now standing at position X. He wants to roll the ball towards Rita. Should Tom exert a force to the left or to the right as shown in the picture? Tom should exert a force to the left. D E F 400 Additional Teacher s Resources 3 What Are the Effects of Forces? Below are some statements about the effects of forces. Write True or False in the box beside each statement. i. Forces can be seen. Statements True/False False Circle Me Out! Fun and Games Look at the picture below and observe what Smarty, Min, Ari, Rita and Tom are doing. a. Circle in blue those applying only a pushing force. (Rita and Min should be circled in blue.) b. Circle in red those applying only a pulling force. (Smarty and Ari should be circled in red.) c. Circle in green those applying both a pushing and pulling force. (Tom should be circled in green.) ii. The effects of a force can be seen and felt. True iii. A push is a force that brings an object nearer to us. False iv. To move an object, a force must be applied. True v. A force can change an object s speed. True vi. A force cannot change an object s size. False Answers to Additional Teacher s Resources Answers to Additional Teacher s Resources Science SMART Teacher s Guide Grade 3 401 Hint: Answers to Additional Teacher s Resources Exam Practice Process skills: Observing, Analysing, Inferring Tom and Ari have two similar plasticine balls. Tom is trying to stretch his plasticine ball, while Ari is trying to flatten his. Tom s plasticine ball Ari s plasticine ball a. In the pictures above, draw arrows to show the direction of the forces exerted by Tom and Ari. [2 marks] b. What types of force are Tom and Ari using? Tom: Pull [1 mark] Ari: Push [1 mark] c. What can we conclude from this activity about the effect of forces? [2 marks] Forces can change the shape of an What change have the forces caused to the plasticine balls? object. Chapter Additional Teacher s Resources Glossary Chapter 6: Direction Forcemeter Newton Speed Stationary The path on which something is moving An instrument used to measure force The unit of force The rate at which something moves Not moving Science SMART Teacher s Guide Grade 3 403
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