Aims
In this chapter you will learn the concepts and principles needed to understand mechanical
equilibrium. You should be able to demonstrate your understanding by analysing simple examples
of equilibrium. You will also learn about the interactions between fluids and solid bodies as well as
the concepts - buoyant force and pressure - used to describe the interactions.
Minimum learning goals
When you have finished studying this chapter you should be able to do all of the following.
1. Explain, interpret and use the terms
translational motion, rotational motion, rigid body, equilibrium, stable equilibrium, unstable
equilibrium, neutral equilibrium, axis, torque [moment of a force], centre of gravity,
buoyancy, buoyant force, Archimedes' principle, pressure, pascal, density, barometer.
2. State and apply the relation between force and torque.
3. State the conditions for equilibrium and apply them to simple problems.
4. Describe and explain how the centre of gravity of a body can be located.
5. Describe and explain the forces acting on a body which is wholly or partly immersed in fluid.
Solve simple problems involving buoyancy.
Aims
In this chapter you will learn the concepts and principles needed to understand mechanical
equilibrium. You should be able to demonstrate your understanding by analysing simple examples
of equilibrium. You will also learn about the interactions between fluids and solid bodies as well as
the concepts - buoyant force and pressure - used to describe the interactions.
Minimum learning goals
When you have finished studying this chapter you should be able to do all of the following.
1. Explain, interpret and use the terms
translational motion, rotational motion, rigid body, equilibrium, stable equilibrium, unstable
equilibrium, neutral equilibrium, axis, torque [moment of a force], centre of gravity,
buoyancy, buoyant force, Archimedes' principle, pressure, pascal, density, barometer.
2. State and apply the relation between force and torque.
3. State the conditions for equilibrium and apply them to simple problems.
4. Describe and explain how the centre of gravity of a body can be located.
5. Describe and explain the forces acting on a body which is wholly or partly immersed in fluid.
Solve simple problems involving buoyancy.
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