![]() ![]() Let’s dive into these laws! Newton’s First Law These three laws laid the foundation for Newtonian mechanics - a physical theory that describes the moving of visible objects of different sizes: from tiny ones to super huge as spacecraft, planets, and galaxies. That is how he thought up his three laws that describe the relationship between an object’s motion and the forces that make it move or stop. He would not take things around him for a given and started wondering and investigating what makes objects move. Isaac Newton, as any scientist is supposed to be, was a very curious man. We are talking about Newton’s laws of motion, which are at the basis of the mechanics. He turned upside-down the perception of everyday things and made his contemporaries see the world differently. What we take for granted now once was a mind-blowing discovery. He devoted his life to science, putting his mental capacities at the service of humanity. ![]() He can be considered one of the greatest scientific minds in the history of humankind. Isaac Newton is a 17th-century scientist. But he still came up with so many brilliant ideas! ![]() We are about to disappoint you as that did not really happen. The concept of inertia is the tendency for these objects to continue in their state of rest or uniform motion.What most people think about when they hear the name Newton is an apple that hit him while he was sitting under the tree thinking about physics. In the previous section, we mentioned the motion of vehicles when no resultant force is applied. We can use inertia to describe the unchanged motion of objects. This describes what happens to both moving and stationary objects. We can sum up Newton’s First Law using one word, ‘ inertia’. However, it is not stationary either – it is at constant velocity. There is no resultant force, so the object is no longer changing speed (no acceleration). Moving, Constant Velocity Object – the force of friction increases and catches up, and now equals the driving force. The speed is increasing (starting from 0 km/h at rest). The car starts to accelerate because there is a resultant force. Moving, Accelerating Object – Tom starts the engine, and the driving force of the car now exceeds friction. The resultant force is still zero and the car remains stationary.ģ. This is because the force of his push does not exceed the force of friction pushing the other way. Stationary Object – Tom tries to push his car, but it doesn’t move. The resultant force is zero and the car is stationary: Newton’s First LawĢ. Stationary Object – there are no forces acting on this stationary object. We will look at stationary and moving objects in more detail in the following scenario:ġ. For a moving object, a resultant force will cause acceleration if its in the direction of movement, or deceleration if its against the direction of movement.For a stationary object, a resultant force can only cause acceleration (you can’t slow down from 0!).The object will accelerate or decelerate depending on the direction of forces. If the forces acting on an object are unbalanced, its speed will change.If it is travelling at 4km/h, it will stay at 4km/h. If it is stationary (speed = 0), then it will stay stationary. If the forces on an object are balanced, its speed will not change.This law might not make too much sense to you, so let us break it down. The first law to learn is Newton’s First Law. If forces are unbalanced, we can calculate the resultant force in a particular direction. Sometimes the forces acting on objects can be balanced (they equal each other) or unbalanced.Sometimes these forces act in opposite directions – for example, a car engine drives the car forward, whilst friction opposes this and pushes against the car in the opposite direction. Forces can act on both stationary and moving objects.Newton's First Law (GCSE Physics) Newton’s First Law Balanced and Unbalanced Forces ![]()
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