Newton's Laws
Newton's Laws - 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...
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...
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,...
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.
01:17
Newton's First Law: Introduction
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2023
Motion draws our attention. Motion itself can be beautiful, causing us to marvel at the forces needed to create spectacular sights, such as that of a dolphin jumping out of the water, the flight of a bird, or the orbit of a satellite. The study of motion is kinematics, but kinematics only describes the way objects move—their velocity and acceleration. Dynamics considers the forces that affect the motion of moving objects and systems. Newton's laws of motion are the foundation of dynamics. These...
FAQs
The decisive quantity is the net external force, not any single force considered in isolation. When external forces balance, the object's motion does not change, which provides the physical basis for equilibrium. When they do not balance, the resulting net force identifies the direction in which motion changes.
Newton's second law makes mass an explicit part of motion analysis. For a specified net force, greater mass corresponds to less acceleration, while a smaller mass responds with more acceleration. Alternatively, changing the applied net force changes acceleration for the same mass. This relationship supports quantitative predictions of motion.
The equal-and-opposite forces in Newton's third law act on different bodies, so they should not be treated as two forces canceling on one object. This distinction is crucial when analyzing interactions such as collisions: each body receives its own force, and the pair describes the mutual interaction between the bodies.
Newton's laws work together by separating three questions: whether motion changes, how much acceleration results, and how interacting bodies influence one another. In a trajectory problem, the first law identifies the significance of a net force, the second supplies the force-acceleration calculation, and the third clarifies interaction forces.
To apply the laws to a physical system, begin by identifying the objects and the forces acting externally on them. Determine the net force, then relate that result to mass and acceleration with F = ma. For interacting objects, keep the force on each body distinct. This workflow helps analyze equilibrium, collisions, and trajectories.
Newton's laws remain useful because they connect abstract force analysis with practical design and prediction. Engineers can use them when considering vehicle safety or robotics, while spaceflight analyses rely on the same force, mass, and acceleration relationships. In physics, the laws also organize calculations of equilibrium, collisions, and trajectories across different systems.