Question

across the pond, and lester wondered if adding mass to the boat would affect its speed. he didnt think so, since the motor should keep propelling it at the same rate. lester decided to time the boat as it traveled from one side of the pond to the other. he then taped a pebble to the boat and timed it again. finally, he added a second pebble and repeated the procedure. lester noticed that as he added mass, the trips took longer. the empty boat took the least time to cross the pond, and the boat with two rocks took the longest. lester concluded that adding mass does slow down the boat. he changed his prediction: the motor must provide a set amount of force, so it cant maintain the same speed as more mass is added. he shared his results with his aunt and confirmed that the boats motor exerts a consistent force, so increasing the boats mass reduces its acceleration. next up done for now? try these next: identify control and experimental groups identify independent and dependent variables identify the experimental question identify questions that can be investigated with a set of materials

Explanation:

Step1: Identify experimental elements

The experiment is about the effect of adding mass on boat - speed.

Step2: Determine control group

The control group is the empty boat, as it has no added mass and serves as the baseline.

Step3: Determine experimental group

The experimental groups are the boat with one pebble and the boat with two pebbles, as they have added mass.

Step4: Identify independent variable

The independent variable is the mass added to the boat (no mass, one pebble, two pebbles).

Step5: Identify dependent variable

The dependent variable is the time it takes for the boat to cross the pond (which is related to speed).

Step6: Identify experimental question

The experimental question is "Does adding mass to the boat affect its speed?"

Answer:

• Control group: Empty boat
• Experimental groups: Boat with one pebble, Boat with two pebbles
• Independent variable: Mass added to the boat
• Dependent variable: Time to cross the pond
• Experimental question: Does adding mass to the boat affect its speed?