level: End of chapter questions
Questions and Answers List
level questions: End of chapter questions
| Question | Answer |
|---|---|
| What are forces? Their resultant can be determined using what? | Vector quantities that can be added by a vector triangle Using trigonometry or by scale drawing |
| For a force F at an angle θ to the x-direction, the components are: | x-direction : F cos θ y-direction : F sin θ |
| What is the formula for a moment of force | Moment of force = force x perpendicular distance of the pivot from the line of action of the force |
| What does the principle moment state? | For any object in equilibrium, the sum of the clockwise moments about any point provide by the force acting on the object is equal to the sum of the anticlockwise moments about the same point |
| What is a couple | A couple is a pair of equal, parallel but opposite forces whose effect is to produce a turning effect on a body without linear acceleration |
| What is the formula for a torque of a couple? | One of the forces x perpendicular distance between the forces |
| For an object to be in equilibrium, what 2 factors must be met? | 1. Resultant forces acting on the object must be zero 2. Resultant moment must be zero |