# Motion Along a Straight Line

## PROBLEM·SOLVING TACTICS

PROBLEM SOLVING TACTICS Tactic 1: Do You Understand the Problem? For beginning problem solvers. no difficulty is more common than simply not understanding the problem. The best test of understanding is this: Can you explain the problem in your own words? Write down the given data, with units. using the symbols of the chapter. (In Sample Problem 2·1. …

## Sample Problem

Sample Problem 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 station. (a) What is your overall displacement from the beginning of your drive …

## Average speed

Average speed Average speed  is a different way of describing how fast a particle moves. Whereas the average velocity involves the particle’s displacement  the average speed involves the total distance covered (for example, the number of meters moved). independent of direction  that is. Because average speed does not include direction. it lacks any algebraic sign. Sometimes the same (except …

## Average Velocity and Average Speed

Average Velocity and Average Speed of time t-a graph of x(t). (The notation x(t) represents a function x of t, not the product x times t.) As a simple example, Fig. 2-2 shows the position function x(t) for a stationary armadillo (which we treat as a particle) at x = -2 m. Figure 2-3a, also for an …

## Position and Displacement

Position and Displacement To locate an object means to find its position relative to some reference point, often the origin (or zero point) of an axis such as the x axis in Fig. 2-1. The positive direction of the axis is in the direction of increasing numbers (coordinates), which is toward the right in Fig. 2-1. The opposite …

## Motion

Motion The world, and everything in it, moves. Even seemingly stationary things, such as  a roadway, move with Earth’s rotation, Earth’s orbit around the Sun.the Sun’s orbit. around the center of the Milky Way galaxy, and that galaxy’s migration relative to other galaxies. The classification and comparison of motions (called kinematics) is often challenging. What exactly do you …

## Motion Along a Straight Line

Motion Along a Straight Line On September 26, 1993, Dave Munday, a diesel mechanic by trade, went over the Canadian edge of Niagara Falls for the second time, freely falling 48 m to the water (and rocks) below. On this attempt, he rode in a steel ball with a hole for air. Munday, keen on surviving this plunge that had killed four other stuntmen, …