Its acceleration isĪ cart changes its speed from 90 m/s to 100 m/s in 10 seconds. If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration isĪn object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. While a car travels around a circular track at a constant speed, itsġ) Inertia is zero 2) Velocity is zero 3) Acceleration is zero (NONE OF THE ABOVE) When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance ofġ) Changes its direction 2) Gains speed 3) Loses speed (ALL OF THE ABOVE) Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. What is the speed over the ground of an airplane flying at 100 km/h relative to the air caught in a 100-km/h right-angle crosswind? What is the effect of air resistance on the acceleration of falling objects?Īir resistance decreases the acceleration of falling objects. In its first second of free fall, a dropped softball will fall a vertical distance of When we are talking about how quickly "how fast" changes, we're talking about What exactly is meant by a "freely falling" object?Īn object in free fall falls under gravity alone with no friction. What is the gain in speed per second for a freely falling object? What is the acceleration of a car moving along a straight road that increases its speed from 0 to 100 km/h in 10 s? Galileo discovered that when air resistance can be neglected, all objects fall with the same Which BEST describes what occurs when a body accelerates?Ī ball rolling down an inclined plane each second picks up Gravity is pulling down on the ball, so it accelerates down at a steady rate. Why does the distance traveled by the ball in each half second after it is released change in the way that it does? How does the distance traveled by the ball in the second half second compare with the distance traveled by the ball in the first half second? The ball accelerates at a greater rate for the same duration of time. Why does the final speed attained by the ball at the bottom of the inclined plane change in the way that it does when the angle of the incline plane increases? How does the acceleration of the ball change as the angle of the inclined plane increases?Īs the angle of the inclined plane increases, how does the final speed attained by the ball at the bottom of the inclined plane change? How can you use the graph of velocity versus time to estimate the acceleration of the ball?īy estimating the value of the slope of the graph. It maintains a constant speed, but does not maintain a constant velocity. If a car is moving at 90 km/h and it rounds a corner, also at 90 km/h, does it maintain a constant speed? A constant velocity? Yes, because constant velocity requires constant speed in the same direction. If a car moves with a constant velocity, does it also move with a constant speed? The difference between speed and velocity involves What is the average speed in kilometers per hour of a horse that gallops a distance of 15 km in a time of 30 min? You are not moving relative to the chair, but you are moving over 100,000 km/h relative to the Sun. As you read this in your chair, how fast are you moving relative to the chair? Relative to the Sun?
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