![]() Measuring weight, then, is simply a matter of comparing the pull of gravity on different objects. "Pound" and "kilogram" are just the unit names we give to certain amounts of gravitational pull. For example, when we say that something weighs 2 pounds or 2 kilograms, it means that gravity is pulling on that object two times as strongly as it does on something that ways 1 pound or 1 kilogram. Weight is a comparison of how strongly gravity pulls on one object or another. We call the force of gravity acting upon mass, weight. However, gravity pulls more strongly on an object that has more mass than on an object with less mass. The force of gravity acts upon all matter, everywhere. Models can be used to represent systems and their interactions-such as inputs, processes and outputs-and energy and matter flows within systems. There is a gravitational force between any two masses, but it is very small except when one or both of the objects have large mass-e.g., Earth and the sun. Gravitational forces are always attractive. In order to share information with other people, these choices must also be shared.Įxplanations of stability and change in natural or designed systems can be constructed by examining the changes over time and forces at different scales.Ĭonstruct and present arguments using evidence to support the claim that gravitational interactions are attractive and depend on the masses of interacting objects.Ĭonstruct and present oral and written arguments supported by empirical evidence and scientific reasoning to support or refute an explanation or a model for a phenomenon or a solution to a problem. For any given object, a larger force causes a larger change in motion.Īlignment agreement: Thanks for your feedback! All positions of objects and the directions of forces and motions must be described in an arbitrarily chosen reference frame and arbitrarily chosen units of size. The greater the mass of the object, the greater the force needed to achieve the same change in motion. The motion of an object is determined by the sum of the forces acting on it if the total force on the object is not zero, its motion will change. Plan an investigation individually and collaboratively, and in the design: identify independent and dependent variables and controls, what tools are needed to do the gathering, how measurements will be recorded, and how many data are needed to support a claim.Īlignment agreement: Thanks for your feedback! Science knowledge is based upon logical and conceptual connections between evidence and explanations.Īlignment agreement: Thanks for your feedback! This activity focuses on the following Three Dimensional Learning aspects of NGSS: Plan an investigation to provide evidence that the change in an object's motion depends on the sum of the forces on the object and the mass of the object.Ĭlick to view other curriculum aligned to this Performance Expectation Describe why engineers must balance the relationship between weight of materials and gravity in their designs.Explain that weight is a comparison of the force of gravity pulling on objects with different masses.Environmental engineers analyze the way water flows down a river canyon or the effect of forces pushing against a storage tank's wall.Īfter this activity, students should be able to Aeronautical engineers design light yet strong airplanes and rockets with enough power and fuel to lift away from the pull of gravity. Civil engineers design structures, such as bridges and tall buildings, making material choices that assure they will not fall down. This engineering curriculum aligns to Next Generation Science Standards ( NGSS).Įngineers must balance the relationship between weight of materials and gravity in their designs. ![]() Students learn about weight by building a spring scale from a slinky and observing how it responds to objects with different masses.
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