NLN PAX Science: Physics Questions and Answers Already Passed

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NLN PAX Science: Physics Questions and Answers Already Passed aim of physics ✔✔to understand the physical laws and principles that influence every aspect of daily life displacement of an objec... t ✔✔the distance that an object is from some starting point, and is measured in units of length How does displacement change when an object is in motion? ✔✔it is constantly changing How is motion described? ✔✔by displacement, velocity (speed) and acceleration speed ✔✔distance traveled by an object per unit of time speed = (distance traveled/time) velocity ✔✔speed in a given direction What two things does velocity tell us about a moving object? ✔✔its speed and direction acceleration ✔✔the rate of change in velocity; can be any change in velocity, either positive or negative. deceleration ✔✔negative acceleration or a decrease in velocity and can change in direction How is acceleration calculated? ✔✔(final velocity-original velocity)/time Why can velocity and acceleration be described using vectors? ✔✔because they have both magnitude and direction What quality do all moving objects have? ✔✔momentum; an object traveling at a specific velocity has momentum calculate momentum ✔✔Momentum = mass x velocity conservation of momentum ✔✔the total movement of an isolated system is always constant, ie during a collision, the momentum of each body changes but the total momentum is conserved. One object may lose momentum, but this momentum is gained by other object How is momentum conserved when a moving object hits a stable object, such as a bullet hitting a wall? ✔✔the moving object, like the bullet, delivers an impulse to the wall, and this impulse is said to be the change in the objects momentum Newton's first law ✔✔objects in motion tend to stay in motion and objects at rest tend to stay at rest inertia ✔✔the property of matter that resists any change in motion Newton's second law ✔✔describes the relationship between force, mass and acceleration; the force of an object equals the mass of the object times its acceleration f = ma newton ✔✔the unit that represents a force that accelerates a mass of 1 kg 1 meter per second friction ✔✔force that is exerted on an obj [Show More]

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