1. When the sum of the forces acting on a particle is zero, its velocity is constant; 2. The sum of forces acting on a particle of constant mass is equal to the product of the mass of the particle and its acceleration; 3. The forces exerted by two particles on each other are equal in magnitude and opposite in direction.. newton. SI unit of force; 1 N is the force needed to accelerate an object with a mass of 1 kg at a rate of 1 m/s 2. Newton's first law of motion. body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force; also known as the law of inertia. Newton's second law of motion.
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The force slowing the skidding car is the force of kinetic friction, and since there's no extra vertical forces, the normal force is just m times g. Since the masses cancel, the acceleration won't depend on the mass of the car, but reducing the coefficient of friction will reduce the deceleration, and reducing the deceleration will increase the.. Newton's second law of motion. Newton's second law says that the acceleration and net external force are directly proportional, and there is an inversely proportional relationship between acceleration and mass. For example, a large force on a tiny object gives it a huge acceleration, but a small force on a huge object gives it very little.
