Department of Mathematics and Science

Grade 2 TEACHERS’ WORKSHOP

Big Idea 13: Forces and Changes in MotionTopic VII

Effects of Pushes and Pulls

November 8, 2013

Facilitator: Jessica Hernandez

Mary Tweedy, Curriculum Support Specialist

Department of Mathematics and Science

Benchmarks• SC.2.N.1.1 - Raise questions about the natural world, investigate them in teams through

free exploration and systematic observations, and generate appropriate explanations based on those explorations. (Cognitive Complexity/Depth of Knowledge Rating: High)

• SC.2.N.1.2 - Compare the observations made by different groups using the same tools. (Cognitive Complexity/Depth of Knowledge Rating: Moderate)

• SC.2.N.1.4 - Explain how particular scientific investigations should yield similar conclusions when repeated. (Cognitive Complexity/Depth of Knowledge Rating: High)

• SC.2.N.1.5 - Distinguish between empirical observation (what you see, hear, feel, smell, or taste) and ideas or inferences (what you think). (Cognitive Complexity/Depth of Knowledge Rating: Moderate)

• SC.2.P.13.1 - Investigate the effect of applying various pushes and pulls on different objects. (Cognitive Complexity/Depth of Knowledge Rating: High)

• SC.2.P.13.4 - Demonstrate that the greater the force (push or pull) applied to an object, the greater the change in motion of the object. (Cognitive Complexity/Depth of Knowledge Rating: Moderate)

Department of Mathematics and Science

Lesson Objectives:

By the end of this lesson, students should be able to:• Describe motion• Define force (in terms of push and pull)• Explain the relationship between force and

motionKey Vocabulary:• force, motion, rest, push, pull

Department of Mathematics and Science

Lesson Essential Questions:

• What is motion?• What happens when we push or pull an

object?• What happens when I push or pull an object

strongly?• What happens when I push or pull an object

gently?• What is a force?

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Playground Activity

We are going to outside to find out how many different ways we can move on the playground.

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What is an object doing if it is in motion?

Moving

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What is motion?

Things are moving.

Things in motion change position.

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Different Ways an Object can Move

• fast• slow• around and around • straight• zig zag• up and down

• slide

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What can you do to make an object move?

Give it a push or a pull

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What are a push or a pull that makes something moved called?

Forces

Department of Mathematics and Science

Pushes and Pullshttp://www.bbc.co.uk/schools/scienceclips/ages/5_6/pushes_pulls.shtml

Department of Mathematics and Science

Forces and Movementhttp://www.bbc.co.uk/schools/scienceclips/ages/6_7/forces_movement.shtml

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Puffer Paths

• Key Question: How many puff does it take to move your sheep from the pasture to the sheep pen? (See game board.)

• Materials per student to make a cotton ball “sheep” : drinking straw, cotton ball, chenille stick (pipe cleaner)• Materials per group: game board and tally sheet• Game Objective: Count and record the number of puffs it takes to blow a cotton ball “sheep” along a path on the game board. Compare your group’s data to the data for the whole class.

Department of Mathematics and Science

Connecting Learning

• What happens when we push or pull an object? Answer: It moves.• What happens when I push or pull an object strongly?• What happens when I push or pull an object gently?• What is motion?• Answer: Motion is the change in the position of an object.• What is a force? Answer: A force is a push or a pull that makes something move.

• What are you wondering now about forces?