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Forces and Buoyancy Measurements

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Forces and Buoyancy Measurements

Objects in different fluids showing forces

🔮 Part 1: Predictions

1. What do you think will happen to the weight of an object when it is placed in water?

It will weigh more

It will weigh the same

It will weigh less

2. Complete this sentence:

I think the object will weigh _____________ in oil because _______________________

3. Which forces act on an object in water? (Tick all that apply)

Gravity (pulling down)

Upthrust (pushing up)

Magnetism

Buoyancy

📊 Part 2: Recording Your Measurements

4. Record the weight of your object in each medium. Remember to read the scale carefully!

Object weight in air: _______ N

Object weight in water: _______ N

Object weight in oil: _______ N

5. Calculate the difference in weight:

Weight lost in water = Weight in air - Weight in water = _______ N

Weight lost in oil = Weight in air - Weight in oil = _______ N

6. Which fluid caused the greatest weight loss?

Water

Oil

Both the same

🎯 Part 3: Understanding Forces

7. Draw arrows to show the forces acting on an object underwater:

Label your arrows: gravity, upthrust

8. Why does an object appear to weigh less in water than in air?
9. Match the key terms to their meanings:
Gravity
Upthrust
Buoyancy
Force that pushes objects up in fluids
Ability of fluids to support objects
Force that pulls objects towards Earth
10. Safety check - Which safety rules did you follow today? (Tick all that apply)

Wore safety goggles

Wore gloves when handling oil

Cleaned up spills immediately

Handled equipment carefully

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