Newton's Laws Of Motion
Newton's Laws Of Motion - Related Videos
10:12
Newton's Laws of Motion
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2023
Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA This experiment examines at various situations involving two interacting objects. First, the experiment examines the forces that two objects apply to one another while they collide. The objects are wheeled carts that have variable masses. The purpose of this experiment is to discover when the force the first cart exerts on the other is the same magnitude as the force the second cart exerts back on the first, as well...
01:20
Newton's Law of Motion
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2025
When we observe objects around us, one question that comes to mind is why they move or stay still. The answer to this question can be explained using Newton's laws of motion. These laws describe the fundamental principles of motion and the effects of forces on objects. The first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will continue to move at a constant speed and direction unless acted upon by an external force.
07:32
Newton's Law of Universal Gravitation
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2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Legend states that Isaac Newton saw an apple fall from a tree. He noticed the acceleration of the apple and deduced that there must have been a force acting upon the apple. He then surmised that if gravity can act at the top of the tree, it can also act at even larger distances. He observed the motion of the moon and the orbits of the...
07:52
Hooke's Law and Simple Harmonic Motion
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2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Potential energy is an important concept in physics. Potential energy is the energy associated with forces that depend upon the position of an object relative to its surroundings. Gravitational potential energy, which is discussed in another video, is the energy associated that is directly proportional to the height of an object above...
00:55
Newton's Second Law
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2023
Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same direction as,...
FAQs
The crucial quantity is the net external force, meaning the combined effect of forces acting from outside the object or system. When that net force is zero, the object's motion does not change. When it is nonzero, the object's motion changes, and the resulting acceleration provides a measurable link between force and motion in a model.
Newton’s second law turns force analysis into a quantitative calculation: F = ma. For a fixed mass, increasing the net force increases acceleration, while a larger mass requires more net force to produce the same acceleration. This relationship lets physics models connect measured or specified forces with predicted changes in motion.
Newton’s third-law pair must be interpreted as part of an interaction between two bodies. The forces have equal magnitude and opposite direction, but they belong to the mutual interaction rather than representing two forces acting on a single body in the same way. This distinction is especially important when analyzing collisions or linked mechanical systems.
A useful workflow is to choose the object or mechanical system, identify the relevant external forces, determine their net effect, and then use F = ma to relate that result to acceleration. The final model can be checked against whether the situation concerns equilibrium, a collision, or another mechanical system.
Equilibrium and collisions highlight different consequences of force analysis. In equilibrium, the focus is on conditions that leave motion unchanged. In a collision, the analysis focuses on the forces exchanged during an interaction and the resulting motion. Using the same laws for both situations provides a consistent way to model unchanged and changing mechanical conditions.
Physics uses these laws in laboratory experiments, vehicles, planetary motion, and other mechanical systems. Their value is that the same force-based reasoning can organize observations and predictions in each case. The specific system changes, but the analysis still connects external forces, mass, acceleration, interactions, and resulting motion.