Higher Tier Only
A model aircraft is flying through air. The diagram shows the forces acting on the model aircraft. The weight of the model aircraft is 15.0 N.

Determine the size and direction of the resultant horizontal force acting on the model aircraft. Give your answer in newtons.
Higher Tier Only
Describe the properties of the motion of the model aircraft.
Higher Tier Only
The horizontal forces acting on the model aircraft become balanced.
Suggest how the horizontal forces acting on the model aircraft have changed.
Higher Tier Only
Another aeroplane takes off and the engines quickly exert maximum thrust, which is initially greater than air resistance.
A student attempts to describe this motion, complete their sentences:
Initially, the aeroplane has a very large ................... , but this eventually drops to 0 m/s2.
At this point, air resistance is equal to thrust and the aeroplane has reached ................................ .
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