# Cambridge IGCSE Physics, 3rd edition by Tom Duncan

By Tom Duncan

Recommended through Cambridge overseas Examinations The bestselling name, built by way of foreign specialists - now up-to-date to supply entire insurance of the center and prolonged subject matters within the most up-to-date syllabus. - features a student's CD-ROM that includes interactive checks and perform for all exam papers - Covers the middle and complement sections of the up-to-date syllabus - Supported by means of the main accomplished diversity of extra fabric, together with instructor assets, Laboratory Books, perform Books and Revision publications - Written via well known, professional authors with massive event of training and studying foreign skills

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Additional resources for Cambridge IGCSE Physics, 3rd edition

Example text

Put the results in a table. Do they suggest any relationship between acceleration, a, and force F? Force (F)/(no. e. constant F ) to accelerate first one trolley, then two (stacked one above the other) and finally three. Check the friction compensation of the runway each time. 3 So if m = 1 kg and a = 1 m/s2, then F = 1 N. Substituting in F = kma, we get k = 1 and so we can write F = ma This is Newton’s second law of motion. When using it two points should be noted. First, F is the resultant (or unbalanced) force causing the acceleration a.

E. its greater resistance to acceleration). We now have two ways of regarding g. 8 m/s2. 8 N/kg. ●● Newton’s third law If a body A exerts a force on body B, then body B exerts an equal but opposite force on body A. This is Newton’s third law of motion and states that forces never occur singly but always in pairs as a result of the action between two bodies. For example, when you step forwards from rest your foot pushes backwards on the Earth, and the Earth exerts an equal and opposite force forward on you.

At A it is along the tangent at A; shortly afterwards, at B, it is along the tangent at B; and so on. Velocity has both size and direction; speed has only size. Velocity is speed in a stated direction and if the direction of a moving body changes, even if its speed does not, then its velocity has changed. A change of velocity is an acceleration, and so during its whirling motion the ball is accelerating. It follows from Newton’s first law of motion that if we consider a body moving in a circle to be accelerating then there must be a force acting on it to cause the acceleration.