Why do objects sink or float?

Hands-On Science Lab

(Distance Learning or At School)

For:

-Back to School activity

-Introducing CER (claim, evidence, reasoning) format

-Introducing Density or Buoyancy

-Introducing Experimental Design

This hands-on activity can be completed at home (or in the classroom) with minimal supplies and encourages critical thinking using the CER method. It was created with virtual learning in mind with students at home but participating in distance learning via a device.

Supplies:

-plastic container filled with water

-two small solid objects (not boat-shaped)

Part 1:

Students will choose two objects, one of which they think will sink and one of which they think will float. They will use the CER method to explain their pre-lab thinking. During the activity, they will place the objects in the water to see what happens, write down observations, and write an explanation for what happened. (Pages 1 & 2) (Part 1 is stand-alone and can be done without moving on to Part 2.)

Part 2:

Students design their own experiment using the same supplies. After conducting their experiment, they will use the CER method for a second time to explain the results and conclusions of their experiment. (Pages 3 & 4)

This is an editable Word document.

Student handout for the activity is included (four pages). Students record observations and describe what they think will happen using Claim, Evidence, Reasoning format. This activity can be used to introduce Claim, Evidence, Reasoning format or a density unit. Be prepared to monitor a post-lab discussion about topics such as density and buoyancy.