Question

hint: to revise the hypothesis, you use the results of the investigation to come up with a new explanation.
a motorized toy boat moving across a pond
lester took his motorized toy boat to the park with his cousin. the boat zipped 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.

Explanation:

Step1: Identify the problem

Lester tests if adding mass affects boat speed.

Step2: Analyze the experiment

He times boat with different masses.

Step3: Interpret the results

More mass means longer - time trips.

Step4: Revise the hypothesis

Motor has limited force, mass affects acceleration.

Answer:

Lester initially thought adding mass to the motor - ized toy boat would not affect its speed because the motor should keep propelling it at the same rate. After conducting an experiment where he timed the boat's travel across the pond with different masses (empty, with one pebble, with two pebbles), he found that as he added mass, the trips took longer. He revised his hypothesis to conclude that the motor provides a set amount of force and increasing the boat's mass reduces its acceleration.