Revision guides: Dynamics

The National 5 Physics exam is made up of two question papers. Paper 1 is a multiple choice paper. Paper 2 is made up of questions with several parts that need written answers.

Scalars have a size, while vectors have both size and direction. When adding vector quantities, it is possible to find the size and direction of the resultant vector by drawing a scale diagram.

Velocity-time graphs are used to describe the motion of objects which are moving in a straight line. They can be used to show acceleration and to work out displacement.

Acceleration is the change in speed or velocity of an object over a certain time. It can be calculated by dividing the change in velocity by the total time.

Isaac Newton’s Laws of Motion describe how forces change the motion of an object, how the force of gravity gives weight to all masses, how forces cause acceleration and how forces work in collisions.

The law of Conservation of Energy states that energy cannot be created or destroyed - it can only be transferred from one type to another.

Projectiles and satellites move in curved paths due to the effects of gravitational force. By considering motion in horizontal and vertical directions, we can predict their path.