These three laws have become known as Newton's three laws of motion. The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. There are two clauses or parts to this statement - one that predicts the behavior of stationary objects and the other that predicts the behavior of moving objects.
The two parts are summarized in the following diagram. The behavior of all objects can be described by saying that objects tend to "keep on doing what they're doing" unless acted upon by an unbalanced force. If at rest, they will continue in this same state of rest.
The state of motion of an object is maintained as long as the object is not acted upon by an unbalanced force. All objects resist changes in their state of motion - they tend to "keep on doing what they're doing. There is an important condition that must be met in order for the first law to be applicable to any given motion. The condition is described by the phrase " This concept of a balanced versus and unbalanced force will be discussed in more detail later in Lesson 1.
Suppose that you filled a baking dish to the rim with water and walked around an oval track making an attempt to complete a lap in the least amount of time. The water would have a tendency to spill from the container during specific locations on the track. This means that there is no resultant vertical acceleration. The submarine will continue with the same motion, either remaining stationary or moving at a constant speed.
If the submarine is moving, it is impossible to tell which direction it is moving from the forces alone, only that it will continue in the same direction at the same speed.
Newton's first law According to Newton's first law of motion, an object remains in the same state of motion unless a resultant force acts on it. If the resultant force on an object is zero, this means: a stationary object stays stationary a moving object continues to move at the same velocity at the same speed and in the same direction Examples of objects with uniform motion Newton's first law can be used to explain the movement of objects travelling with uniform motion constant velocity.
Other examples include: a runner at their top speed experiences the same air resistance as their thrust an object falling at terminal velocity experiences the same air resistance as its weight If the forces acting on an object are balanced, the resultant force is zero Examples of objects with non-uniform motion Newton's first law can also be used to explain the movement of objects travelling with non-uniform motion. This tendency to resist changes in a state of motion is inertia.
There is no net force acting on an object if all the external forces cancel each other out. Then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force acts on an object, the velocity will change because of the force. His second law defines a force to be equal to change in momentum mass times velocity per change in time.
Momentum is defined to be the mass m of an object times its velocity V. The airplane has a mass m0 and travels at velocity V0. The mass and velocity of the airplane change during the flight to values m1 and V1. Let us assume that the mass stays a constant value equal to m. The weight of the fuel is probably small relative to the weight of the rest of the airplane, especially if we only look at small changes in time.
If you decide to study physics in college, you'll definitely learn how to apply these laws to understand real-life problems! In high school classes, you usually do simpler examples like how a ball flies through the air. But even that is pretty important, if you like to play baseball! Luckily, humans naturally are good at understanding how things move, so you probably won't have to do any math problems to catch a baseball.
If you want to land a spaceship on the moon, though, you'll have to study a lot harder!
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