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The resistivity is a characteristic of the material used to fabricate a wire or other electrical component, whereas the resistance is a characteristic of the wire or component. To calculate the resistance, consider a section of conducting wire with cross-sectional area A, length L, and resistivity ρ.
1. Phoebe Physics pulls a wagon with a force of 80 N. a) What is the net force if the force of friction between the wagon and the ground is 12 N? b) If she uses 80 N to pull the wagon through a mud puddle, and the net force on the wagon is 38 N, what friction force acts on the wagon? 2. How much force is required to keep a 780 N box moving at ...
Different materials offer different resistance to the flow of charge. We define the resistivity ρ of a substance so that the resistance R of an object is directly proportional to ρ. Resistivity ρ is an intrinsic property of a material, independent of its shape or size.
Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire's resistance. The sizes of the symbols in the equation change along with the diagram of a wire.
Define normal and tension forces. Apply Newton's laws of motion to solve problems involving a variety of forces. Use trigonometric identities to resolve weight into components. Forces are given many names, such as push, pull, thrust, lift, weight, friction, and tension.
This is a resistive force produced when an object moves inside a fluid (a liquid or a gas). The object tries to displace the fluid's molecules during the motion to make place to itself. As a result, a resistive force is produced by the fluid, which tries to maintain its original position and structure.
Key points. Resistance (shown as R) is a measure of how difficult it is for current to flow. Resistance is measured in units called ohms (Ω). The amount of. current. flowing in a circuit is...
