# Danh mục: Kinematics

• ## Acceleration

A. Acceleration 1. Acceleration When a particle’s velocity changes, the particle is said to undergo acceleration (or to accelerate). For motion along an axis, the average acceleration aavg over a time interval  ( Delta t  ) is  ( {{a}_{avg}}=frac{{{v}_{2}}-{{v}_{1}}}{{{t}_{2}}-{{t}_{1}}}=frac{Delta v}{Delta t} ) Where the particle has velocity v1 at time t1 and then velocity v2 […]

• ## Instantaneous Velocity and Speed

A. Instantaneous Velocity and Speed 1. Instantaneous Velocity and Speed You have now seen two ways to describe how fast something moves: average velocity and average speed, both of which are measured over a time interval  ( Delta t  ). However, the phrase “how fast” more commonly refers to how fast a particle is moving […]

• ## Position, displacement, and average velocity – Problems and solutions

Position, displacement, and average velocity – Problems and solutions Example 1. You drive a beat-up pickup truck along a straight road for 8.4 km at 70 km/h, at which point the truck runs out of gasoline and stops. Over the next 30 min, you walk another 2.0 km farther along the road to a gasoline […]

• ## Position, displacement, and average velocity

Position, displacement, and average velocity 1. What is Physics? One purpose of physics is to study motion of objects – how fast they move, for example, and how far they move in a given amount of time. NASCAR engineers are fanatical about this aspect of physics as they determine the performance of their cars before […]

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