Final answer:
The position vs time graph of an object speeding up is not straight, so the statement is false. An object moving with constant acceleration has a curved displacement vs time graph and a straight displacement vs time squared graph, so that statement is true. The average speed being less than the average velocity is false, and kinetic friction being less than static friction is true.
Step-by-step explanation:
The position vs time graph of an object that is speeding up is not a straight line; therefore, the statement is False. When an object is speeding up, the slope of the position vs time graph increases, which results in a curved line, specifically a parabolic shape if the acceleration is constant.
Considering an object moving with constant acceleration, the displacement vs time graph is indeed a curved line because the object covers increasing distances in equal time intervals. The displacement vs time squared graph, however, is a straight line if the acceleration is constant. This means the statement is True.
The average speed of an object is the total distance traveled divided by the time taken, whereas the average velocity is the displacement divided by the time taken. If the object changes direction, the average speed can be greater than the average velocity since displacement could be less than the total distance traveled. Therefore, it is False to say that the average speed will be less than the average velocity.
Kinetic friction is usually less than static friction because once an object is in motion, it generally encounters less resistance moving than when starting from rest. This makes the statement True.