Students are required to design and build a boat that can hold a load of at least 400 g but sink with a load of 500 g. Along with
their completed boat, students will submit a report explaining their boat design and the physics principles behind their design.
They will be asked to define a system, identify and represent the internal and external forces on the system using a free body
diagram, and carry out an analysis of the net force on the system. For each force, students will be required to identify the
interaction between two objects that cause the force. All contact forces must be described in terms of interatomic electric
forces and the buoyant force must also be related to the density of the water. The project will conclude with the submission of
the report and an in-class test of the boat that the student designs and builds.
(LOs: 1.E.1.1, 2.B.1.1, 3.A.2.1, 3.A.3.1, 3.A.3.3, 3.B.1.1, 3.B.1.2, 3.B.2.1, 3.C.4.2, 4.A.2.2)
Learning Objectives:
1.E.1.1 The student is able to predict the densities, differences in densities, or changes in densities under different conditions
for natural phenomena and design an investigation to verify the prediction
2.B.1.1 The student is able to apply F = mg to calculate the gravitational force on an object with mass m in a gravitational field
of strength g in the context of the effects of a net force on objects and systems.
3.A.2.1 The student is able to represent forces in diagrams or mathematically using appropriately labeled vectors with
magnitude, direction, and units during the analysis of a situation.
3.A.3.1 The student is able to analyze a scenario and make claims (develop arguments, justify assertions) about the forces
exerted on an object by other objects for different types of forces or components of forces.
3.A.3.3 The student is able to describe a force as an interaction between two objects and identify both objects for any force.
3.B.1.1 The student is able to predict the motion of an object subject to forces exerted by several objects using an application
of Newton’s second law in a variety of physical situations with acceleration in one dimension.
3.B.1.2 The student is able to design a plan to collect and analyze data for motion (static, constant, or accelerating) from force
measurements and carry out an analysis to determine the relationship between the net force and the vector sum of the
individual forces.
3.B.2.1 The student is able to create and use free-body diagrams to analyze physical situations to solve problems with motion
qualitatively and quantitatively.
3.C.4.2 The student is able to explain contact forces (tension, friction, normal, buoyant, spring) as arising from interatomic
electric forces and that they therefore have different directions
4.A.2.2 The student is able to evaluate using given data whether all the forces on a system or whether all the parts of a system
have been identified