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Floating and sinking34275364243568475.pptx
- 1. Developing Identify somethingthat floats or sinks ProgressingMake observations and record them AdvancingDraw a force diagram ExcellingWrite a simple conclusion LO:Learn about the effects of forces Floating and Sinking
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- 3. Upthrust and weight Anobject in water has two forces acting upon it- upthrust and weight Upthrust is the upwards force exerted by a liquid on the object Weight is the force of gravity on the object
- 4. The ship isfloating because the upthrust is the same size as the weight Upthrust and weight
- 5. If the upthrust exertedby the water is 300N and the weight of the boat is 300N, does the boat sink or float? Checkpoint
- 6. How many massescan a piece of paper hold before it sinks? Floating paper
- 7. How can Ichange the paper to help it take more mass? Floating paper
- 8. Who can makea paper boat the holds the biggest mass? Lets find out. Floating paper
- 9. • What equipmentwill you need? • What mass will your boat hold? • How will you do the experiment? • Draw a diagram Floating paper
- 10. Boat Mass in gBoat 1: Boat 2: Boat 3: 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 Floating paper
- 11. • Which boatwas the best? • Why? • How could you make the experiment better? Floating paper
- 12. A rubber duck hasa weight of 3N and an upthrust of 2N. Does the duck float or sink? Checkpoint
- 13. The dive toyssink to the bottom of the swimming pool. Draw a diagram labelling the forces and explain why the toys have sunk. Upthrust and weight
- 14. The dive toyssink to the bottom of the pool because the weight and upthrust are unbalanced. The weight is more than the upthrust so the toys will sink. Upthrust and weight
- 15. …explain why something floatsor sinks using the key words Key words: Upthrust, weight, float, sink, density Can you…