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A marine research station uses floating weather buoys to monitor ocean conditions.

Four different buoys, labeled A, B, C, and D, have the same volume but are made of different materials. They are shown floating in sea water below.

Four cylindrical buoys of equal volume floating in sea water. Buoy A is submerged exactly halfway (50%). Buoy B is almost entirely submerged (90%). Buoy C is slightly more than half submerged (60%). Buoy D has only a tiny portion submerged (15%).

Which buoy has the largest weight?

[2]

One of the buoys has a mass of $kg15\text{ kg}$ . The gravitational field strength is $N/kg9.8\text{ N/kg}$ . Calculate the weight of this buoy. Use the equation: $strength\text{weight} = \text{mass} \times \text{gravitational field strength}$

[2]

When floating on the sea, the two vertical forces acting on the buoy are the weight downwards and the upthrust upwards. How does the size of the upthrust compare to the weight of the buoy?

The upthrust is greater than the weight.
The upthrust is less than the weight.
The upthrust is equal to the weight.

[1]

Write down the equation which links acceleration, mass, and resultant force.

[1]

A boat pulls the weather buoy with a tether. A resultant force of $N18.0\text{ N}$ acts on the buoy. Calculate the acceleration of the buoy if its mass is $kg15\text{ kg}$ .

[2]

Forces and motion Questions

Practise AQA GCSE Physics Forces and motion with exam-style questions for Foundation and Higher tier. 83 questions covering Describing motion along a line, Forces, accelerations and Newton's Laws of motion, and Forces and braking, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.