College Physics

Discussion The displacements found in this example seem reasonable for stopping a fast-moving car. It should take longer to stop ...

A negative value for time is unreasonable, since it would mean that the event happened 20 s before the motion began. We can disc ...

equations representing those principles. Although finding the correct equation is essential, keep in mind that equations represe ...

2.7 Falling Objects Falling objects form an interesting class of motion problems. For example, we can estimate the depth of a ve ...

Figure 2.39 We are asked to determine the positionyat various times. It is reasonable to take the initial positiony 0 to be zero ...

Figure 2.40Vertical position, vertical velocity, and vertical acceleration vs. time for a rock thrown vertically up at the edge ...

Example 2.15 Calculating Velocity of a Falling Object: A Rock Thrown Down What happens if the person on the cliff throws the roc ...

Figure 2.42(a) A person throws a rock straight up, as explored inExample 2.14. The arrows are velocity vectors at 0, 1.00, 2.00, ...

Figure 2.43Positions and velocities of a metal ball released from rest when air resistance is negligible. Velocity is seen to in ...

1. Identify the knowns.y 0 = 0;y= –1.0000 m;t= 0.45173;v 0 = 0. 2. Choose the equation that allows you to solve forausing the kn ...

Slopes and General Relationships First note that graphs in this text have perpendicular axes, one horizontal and the other verti ...

Notice that this equation is the same as that derived algebraically from other motion equations inMotion Equations for Constant ...

Figure 2.48Graphs of motion of a jet-powered car during the time span when its acceleration is constant. (a) The slope of anxvs. ...

Figure 2.49A U.S. Air Force jet car speeds down a track. (credit: Matt Trostle, Flickr) The graph of displacement versus time in ...

The Slope ofvvs.t The slope of a graph of velocityvvs. timetis accelerationa. (2.98) slope =Δv Δt =a Since the velocity versus t ...

Figure 2.51Graphs of motion of a jet-powered car as it reaches its top velocity. This motion begins where the motion inFigure 2. ...

acceleration due to gravity: acceleration: average acceleration: average speed: average velocity: deceleration: dependent variab ...

instantaneous velocity: kinematics: model: position: scalar: slope: time: vector: y-intercept: velocity at a specific instant, o ...

Initial position and velocity are given a subscript 0; final values have no subscript. Thus, Δt = t Δx = x−x 0 Δv = v−v 0 ⎫ ⎭ ...

9.There is a distinction between average speed and the magnitude of average velocity. Give an example that illustrates the diffe ...