Physical Science: Extension A Quiz

During a lesson, you are asked to respond to the following three statements. Statement #1: How do you think the speed-time graph would change if you gave it a harder push? Statement #2: Record the speed-time graph after the instructor gives the car a push. Statement #3: Why are the slopes of the two portions of the speed-time graph different? Which of these statements are asking you to make an observation, make an inference, or make a prediction?

#1 is a prediction #2 is an observation #3 is an inference.

Below is the speed-time graph for an object that can move in either direction along a track. Which of the following statements could best match the speed-time graph?

The object speeds up at a certain rate, then slows down at a lower rate to a momentary stop, changes direction, and finally speeds up again at the same rate as it initially sped up.

Consider the following scenario. A car speeds up from rest, then travels at a constant speed, then speeds up again, but at a slower rate than at first. Then the car slams on its brakes, slowing down at a rate greater than the rates of speeding up. Which of the following speed-time graphs most reasonably matches this description of the car's motion?

a