Question

jules is conducting an experiment involving friction. he is measuring the temperature of various objects and surfaces after quickly rubbing them together. he is testing a steel ball bearing and a tennis ball on carpet, linoleum flooring, and a glass surface by rubbing the object 20 times in 6 seconds over the surface. select the prediction jules developed as either correct prediction or incorrect prediction based on his experiment. the temperature of the surface of the ball bearing when rubbed over the glass will be the least. select the tennis ball over the linoleum floor will have no friction, as the temperatures will not change. select the ball bearing over the linoleum floor will be the same temperature as the tennis ball over the carpeted surface. select the temperature of the tennis ball over the carpet will be the highest. select the temperature of the tennis ball and the ball bearing over the glass surface will be the same. select

Explanation:

• First statement: Glass has a smooth surface, so friction (and thus heat generated) is less. So, the prediction that the temperature of the ball - bearing on glass is the least is correct.
• Second statement: All surfaces (even smooth ones like linoleum) have some friction. So, the prediction that there is no friction (and thus no temperature change) for the tennis ball on linoleum is incorrect.
• Third statement: Linoleum has less friction than carpet. Also, a steel ball - bearing (metallic, smooth) has less friction than a tennis ball (textured, more surface area in contact in some ways). So, the temperatures will not be the same. The prediction is incorrect.
• Fourth statement: Carpet has a rough surface, which causes more friction. A tennis ball (textured) on carpet will have more friction (and thus more heat) compared to other combinations. So, the prediction is correct.
• Fifth statement: A steel ball - bearing (smooth, metallic) has less friction on glass than a tennis ball (textured). So, their temperatures will not be the same. The prediction is incorrect.

Answer:

1. Correct Prediction
2. Incorrect Prediction
3. Incorrect Prediction
4. Correct Prediction
5. Incorrect Prediction