A marine engineer is testing the propulsion system of a newly designed Remotely Operated Vehicle (ROV) in a test tank.
In the first trial, under a constant horizontal thrust, three independent sensors measure the horizontal acceleration of the ROV. The recorded values are: 0.84 m/s2,0.89 m/s2,0.82 m/s20.84 \text{ m/s}^2, \quad 0.89 \text{ m/s}^2, \quad 0.82 \text{ m/s}^20.84 m/s2,0.89 m/s2,0.82 m/s2
Calculate the mean acceleration of the ROV.
In a second trial, the ROV is loaded with scientific instruments so that its total mass is 45.5 kg45.5 \text{ kg}45.5 kg. It is observed to accelerate vertically upwards at 0.64 m/s20.64 \text{ m/s}^20.64 m/s2.
Calculate the magnitude of the resultant vertical force acting on the ROV. Use the equation: resultant force=mass×acceleration\text{resultant force} = \text{mass} \times \text{acceleration}resultant force=mass×acceleration
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.