Final answer:
True, When traction is poor during rain or snow, it's true that you should accelerate gradually to maintain good traction. The related physics concepts discuss average speed vs. velocity, the graphical representation of acceleration, and the energy efforts required while cycling up a hill.
Step-by-step explanation:
When traction is poor, as in rain or snow, it is indeed true that you should speed up very gradually. The reason for this is to maintain as much traction as possible between the tires and the road surface to prevent slipping or skidding. Quick accelerations can cause the tires to spin and lose grip, leading to a loss of control.
Explanation for Related Principles:
Now with regard to the other principles stated:
- True or False: The average speed of the ball will be less than the average velocity of the ball. The statement is True if the ball changes direction during its journey, since speed is the magnitude of velocity and does not take direction into account, whereas velocity is a vector quantity and does include direction. If there has been a change in direction, the displacement could be zero (if the ball returns to its start point), making the average velocity zero while the average speed is positive.
- True or False: The position vs time graph of an object that is speeding up is a straight line. This is False. When an object is speeding up, the slope of the position vs time graph increases, which means the graph should be a curve that is getting steeper over time - not a straight line.
- True or False: While riding a bicycle up a gentle hill, it is easy to increase your potential energy, but increasing your kinetic energy would make you feel exhausted. This is True, because as you climb the hill, your potential energy increases due to elevation. However, to increase your kinetic energy, you would need to pedal faster, which would require more effort, thus making you feel exhausted.