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Mechanical Equilibrium Questions

Mechanical Equilibrium Questions. A force is a push or pull. Net force is the combination (sum) of all acting forces. QUESTION #1A: What is the difference between force and net force on an object? (Section 2.1). 90° The Normal Force is perpendicular to the surface.

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Mechanical Equilibrium Questions

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  1. MechanicalEquilibriumQuestions

  2. A force is a push or pull. Net force is the combination (sum) of all acting forces. QUESTION #1A:What is the difference between force and net force on an object?(Section 2.1)

  3. 90° The Normal Force is perpendicular to the surface. QUESTION #1B:What is the angle between the Normal Force and the surface an objects rests upon? (Section 2.3)

  4. The Net Force is 10N. 40N + (-30N) = 10N QUESTION #2A:What is the net force on a box that is being pulled to the right with a force of 40N and pulled to the left with a force of 30N? (Section 2.1)

  5. Yes! If it moves at a constant velocity in a straight line. Then ΣF = 0. QUESTION #2B:Can an object be moving and still be in equilibrium? Defend your answer.(Section 2.4)

  6. Magnitude And Direction QUESTION #3A:What 2 quantities are necessary to determine a vector quantity?(Section 2.1)

  7. It means that the sum of all the forces that act on an object in equilibrium equal zero. QUESTION #3B:What does ΣF = 0 mean?(Section 2.2)

  8. Scalar quantity is measured by magnitude only; a number. Vector quantity needs both magnitude and direction for its description. QUESTION #4A:How does a vector quantity differ from a scalar quantity?(Section 2.1)

  9. Both forces are equal in magnitude, but opposite in directions. Thus, the net force is zero. QUESTION #4B:If you push a crate across a factory floor at constant speed in a constant direction, what is the magnitude of the force of friction on the crate compared with your push?(Section 2.4)

  10. Force and velocity are vector quantities. Time, area, and volume are scalar quantities. QUESTION #5A:Give an example of a vector quantity.Give an example of a scalar quantity.(Section 2.1)

  11. The net force is zero, as the rule ΣF = 0 states. QUESTION #5B:What is the net force on an object at rest?(Section 2.2)

  12. It is correct to say no net force, as both gravity and the normal force of the floor act on the cat. Think AND Explain #1A cat lies on the floor. Can you say that no force acts on the cat? Or is it correct to say that no net force acts on the cat? Explain.

  13. The maximum will occur when the forces are in the same direction – so 20N +12N = 32N. The minimum will occur when they are in opposite directions – so 20N + (-12N) = 8N. Think AND Explain #2Consider 2 forces, one having a magnitude of 20N and the other having a magnitude of 12N.  What is the maximum net force possible for these two forces? The minimum?

  14. The sum of all the forces (net force) must equal zero. Yes, it must be zero if it is in mechanical equilibrium. Think AND Explain #3When a box of chocolate bars is in mechanical equilibrium, what can be correctly said about all the forces that act on it? Must the net force necessarily be zero?

  15. Agree! If only a single force acts on it, it will not be in equilibrium. There must be one or more additional forces to produce zero net force for equilibrium. Think AND Explain #4Ms. Robak says that an object cannot be in mechanical equilibrium when only a single force acts on it. Do you agree or disagree? Explain.

  16. There are two: Weight and the Normal Force. Think AND Explain #5How many significant forces act on your physics book when it is at rest on a table? Identify the forces.

  17. Yes – It is not undergoing a change in motion. The force if the moving puck is equal but opposite the frictional force between the ice and hockey puck. Think AND Explain #6Justin sends a hockey puck sliding across the ice at a constant speed. Is the puck in equilibrium? Why or Why not?

  18. 200N. Since it is moving at a constant speed in a straight line, it is in equilibrium. Therefore, the force Alyssa puts on the crate is the same as the force of friction. Think AND Explain #7Alyssa pulls horizontally on a crate with a force of 200N, and it slides across the floor at a constant speed in a straight line. How much friction is acting on the crate?

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