Kinetic energy and work

Energy is a significant quantity in all branches of physics, largely because it is conserved. These slides introduce energy, specifically the kinetic energy of a moving object. The conservation of energy is used to relate kinetic energy to ‘work’. Work is a measure of how much energy is associated with the action of a force. Some questions are also included.

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Adding Vectors

The addition of vectors is very useful for solving problems when more than one vector is involved in a calculation.  This would include situations where multiple forces are acting, situations where we consider multiple velocity components, and situations where an object is displaced more than once.

Vector addition allows us to reduce many vectors into one equivalent vector, thus simplifying the problem to be solved.  These slides outline vector addition and apply it to Newton’s second law.  Sample problems are provided to determine the resultant force (net force), resultant velocity and total displacement.

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Acceleration and force

We often measure how things change over time.  When we measure how position changes over time, this is called velocity. If we measure how velocity changes with time, it is called acceleration. Acceleration is present whenever there is a change in velocity.

The slides cover acceleration, and it’s relationship with force through Newton’s first and second laws. Relevant equations are introduced.

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Vectors, distance and displacement

Mechanics is the study of motion.  One of the most important quantities to consider in mechanics is where something is in relation to another point.  This is called displacement and is a vector quantity – which means it has both magnitude (how far away) and direction.

These slides outline the quantities distance and displacement, and also introduce the concept of vectors (and their opposite – scalars).

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