2. Exercises

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Exercise 2.1

A man, of mass 75 kg, stands on a horizontal surface. Assume that the man has two points of contact with the ground.

a) Draw a diagram to show the forces acting on the man.

b) Calculate the magnitude of each of these forces.

Answer
Answer 2.1
Solution a
Solution 2.1a
Solution b
Solution 2.1b

Exercise 2.2

An aeroplane circles an airport at a constant speed. Are the forces acting on the aeroplane in equilibrium? Explain your answer.

Answer
Answer 2.2
Solution
Solution 2.2


Exercise 2.3

A helicopter, of mass 800 kg, is rising at a constant rate.

a) Are the forces acting on the helicopter in equilibrium?

b) Calculate the magnitude of the vertical lift force on the helicopter.


Answer
Answer 2.3
Solution a
Solution 2.3a
Solution b
Solution 2.3b


Exercise 2.4

Calculate the magnitude of the force that gravity exerts on each of the following objects.

a) A car of mass 1250 kg.

b) A table tennis ball of mass 4 grams.

c) A lorry of mass 4.2 tonnes.


Answer
Answer 2.4
Solution a
Solution 2.4a
Solution b
Solution 2.4b
Solution c
Solution 2.4c
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