SEEd: Inv. Forces- Lesson 1 Pushes, Pulls, and Motion

SEEd: Investigating Forces- Lesson 1 Pushes, Pulls, and Motion

Core Knowledge Science-- 3rd Grade

The Big Question​

​What is force?

​What are some examples of unexpected movements you have heard about or seen?

Discuss at your table​

​Death Valley Sailing Stones

The next few slides contain images of the “sailing stones” of Death Valley National Park near the border of California and Nevada.

​

• It is the driest and lowest place in North America.

• Although no one has ever seen them moving, people have observed evidence that large rocks move across the desert ground, seemingly by themselves.

• They even leave trails behind them. ​

What might cause a rock to move?

Discuss at your table

Multiple Select

What causes the sailing stones of Death Valley to move? (select all correct answers)

• wind

• ice

• gravity

• water

​What is a Force?

​

A force is a push OR a pull

Poll

In the example of the "sailing stones" at Death Valley, what force is the wind having on the rocks?

• PUSH

• PULL

In the example of the "sailing stones" at Death Valley, what force is the wind having on the rocks?​

PUSH​

​Sailing Stones

• The wind slowly pushes the rocks forward as the ice melts under them.

• The force of the wind causes the rocks to move, leaving a trail behind them.

More About Forces:​

• Pushes and pulls act on objects in certain directions.

​

• ​Forces can cause objects to change motion, direction, or speed.

Open Ended

Think of at least five ways pushes and pulls affect your daily life. (Example: I push my take-home folder into my backpack.)

I Wonder...​

Write down any "I wonder...." statements or questions you might come up with about FORCES on a sticky note.

​Activity Page 1.1

​Example of a Pencil

• You push the pencil to move it along the paper.

• You pull the pencil to pick it up.​

​How Does the Pencil

Change Motion?

​Discuss at your table

​​How Does the Pencil Change Motion?

​The pencil changed motion by the amount of pressure used to move it back and forth when writing.

What Happens to the Pencil When More Force is Applied?

What Happens to the Pencil When More Force is Applied?

More force pressing down makes the writing darker.

What direction do PUSH forces act?

What direction do PUSH forces act?

PUSH forces move the object in the direction of the push.

​Activity Page 1.1

Draw an object you have PUSHED to make it move.

(Push forces should have an arrow facing the object in your drawing.​)

What direction do PULL forces act?

What direction do PULL forces act?

PUSH forces move the object in the direction of the push.

​Activity Page 1.1

Draw an object you have PULLED to make it move.

(Pull forces should have an arrow facing away from the object in your drawing.​)

Multiple Choice

True or False: A Force is a Push OR a Pull.

• True

• False

Draw

Show the direction of the force in this picture with arrows.

Multiple Choice

What does the picture shows?

• Push

• Pull

Multiple Choice

Name the force.

• Push

• Pull

Multiple Choice

Name the force.

• Push

• Pull

Multiple Choice

What is happening in the picture?

• Push

• Pull

Multiple Choice

What force is being shown in this picture?

• Push

• Pull

Multiple Choice

Push or pull?

• Push

• Pull

Multiple Choice

Push or Pull?

• Push

• Pull

Multiple Choice

Taking Your History Book Out of Your Cubby is an Example of What Type of Force?

• Push

• Pull