![]() ![]() Rearranging this to make the subject, gives us our first constant acceleration formula: If you have an initial velocity and a final velocity the graph would look something like this: Plot showing u against tĪs I previously said, the gradient of the line is equal to acceleration. time graph, the gradient of the line is equal to acceleration and the area under the line is equal to displacement. SUVAT Equation 1Īs you probably already know, velocity divided by time is equal to acceleration and velocity multiplied by time is equal to displacement. Like these equations are incredibly important in Dynamics. There may seem a lot to remember there, but believe me, it’s not as difficult as it seems. You may have heard them referred to as kinematic equations, equations of motion, SUVAT equations, or maybe you’ve not heard of them at all. These go by so many different names it’s hard to keep up sometimes. This law basically means that if you push against a wall, it pushes you back, which is a good job really because otherwise you’d go straight through! Constant Acceleration Formulae ![]() Every action has an equal and opposite reaction It makes sense that if something has a greater mass, it would take a larger force to give it the same acceleration as something with less mass.ģ. It’s not too difficult to understand either. It’s one of those which pops up all over the place in Dynamics and is a really good idea to learn. More simply known as, this is probably one of the most fundamental formulae in Dynamics. The force on an object is equal to its mass multiplied by its acceleration. Unless a force is applied to a stationary particle, it doesn’t start moving.Ģ. However, if you think about a stationary particle, this makes far more sense. Obviously in real life this does not happen as there are air resistance and friction, so it’s almost impossible to have no external force on a moving particle. ![]() If there was no friction or air resistance, then a particle moving at 5 would carry on indefinitely. This just means that provided no external force acts upon a particle it won’t change it’s motion in any way. A particle will remain at rest or continue with its motion, unless acted upon by an external force. Every action has an equal and opposite reaction.Īll of this is fine, but what do these laws really mean?ġ.The force on an object is equal to its mass multiplied by its acceleration ( ).A particle will remain at rest or continue with its motion, unless acted upon by an external force. ![]() The things Newton is most famous for (aside from the incident with the apple) are his laws of motion: We have him to thank for gravity (I should probably add he discovered, not invented it, otherwise people will start blaming him every time they fall over). If we said that the velocity to begin with was the same as the speed: 10, then when the body is travelling in exactly the opposite direction, with the same speed, the velocity would be – 10. The speed before it turned around is the same as after. If a body is travelling horizontally in a straight line with a speed of 10 then stops and goes in the exact opposite direction, with a speed of 10 there has obviously been a change, however the speed does not reflect this. Probably the best way to consider velocity is if you think or an ordinary x,y-axis. Speed is just how fast something is going, it doesn’t matter if it’s going up, down, left or right, all that matters is how far it travels in a set time. It might seem sometimes that speed and velocity are the same thing (often they’re equal to each other), but they are actually slightly different.
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