Question

1. how does the size of a bicycle tire affect the distance it will travel when it is pedaled in a given number of times? constant/control variables: __________ hypothesis/prediction: __________

Explanation:

Step1: Identify the concept

The distance a bicycle tire travels when pedaled a certain number of times is related to the circumference of the tire. The larger the tire (larger radius or diameter), the larger the circumference.
The formula for the circumference of a circle is $C = 2\pi r=\pi d$ (where $r$ is the radius and $d$ is the diameter).

Step2: Determine constant/control variables

The number of pedal - strokes is a control variable. Also, the surface on which the bicycle is moving (as different surfaces can affect friction and thus the motion), and the force applied while pedaling should be kept constant.

Step3: Formulate hypothesis

A larger - sized bicycle tire (with a larger radius or diameter) will travel a greater distance when pedaled the same number of times because its circumference is larger, and in each full rotation, it covers a longer linear distance.

Answer:

Constant/Control Variables: Number of pedal - strokes, surface type, force applied while pedaling.
Hypothesis/Prediction: A larger - sized bicycle tire will travel a greater distance when pedaled the same number of times.