Lesson: Drawing Conclusions Physics
In this lesson, we will learn how to analyze and interpret information in order to determine what can be known from it using scientific methods.
Newton’s first law of motion states that an object in motion will not change its speed unless something pushes or pulls the object. A student gives a single, short push to a ball and the ball rolls along flat ground. The student observes that the ball slows down but does not see anything push or pull the ball. Which of the following conclusions that the student might arrive at is correct?
A student observes that the temperature of some water placed on a hot plate increases over a two-minute time interval. The student concludes that the temperature increase of the water will be fifty times greater if the water is left on the hot plate for a time interval that is fifty times longer. Which of the following statements about the student’s conclusion is correct?
A scientist performs an experiment. He observes that a sample of a substance normally floats on water but sinks in the water if the sample is first heated to a temperature greater than then immediately placed in room-temperature water. Determine whether the experiment supports, contradicts, or neither supports nor contradicts each of the following statements.
A sample that has been heated to a temperature above sinks if the water it is placed in is at room temperature.
A sample that has been heated to a temperature above sinks if the water it is immediately placed in is at a temperature that is less than but greater than room temperature.
A sample that has been heated to a temperature above will not sink if it has a temperature less than when it is placed in water at room temperature.
An unheated sample would sink when placed in water that has a temperature of at least .