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Twelfth Grade (Grade 12) Mechanics Questions

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Grade 12 Energy and Momentum
A 55 kg person walks up a staircase, and a second 55 kg person runs up the staircase. Who develops more power and why?
  1. the person who walks up because he takes more time, using more energy
  2. the person who runs up because he takes less time
  3. same power for both because both cover the same distance with the same force
  4. not enough information to determine
Grade 12 Energy and Momentum
Grade 12 Forces and Motion
Grade 12 Forces and Motion
If the acceleration of an object is negative, its velocity                    
  1. will be increasing.
  2. will be decreasing.
  3. will be zero.
  4. will be constant.
Grade 12 Forces and Motion
If a body goes from 10m/s to 50m/s in 8 seconds, what is its acceleration?
  1. [math]1.25m/s^2[/math]
  2. [math]5m/s^2[/math]
  3. [math]6.25m/s^2[/math]
  4. [math]40m/s^2[/math]
Grade 12 Energy and Momentum
A force applied to a body is said to do "work"
  1. if the body is displaced in the direction of the applied force.
  2. if the body is displaced in the direction opposite to the applied force.
  3. even if the body does not move.
  4. only when the body is moving.
Grade 12 Forces and Motion
What is the definition of acceleration?
  1. An object's resistance to motion
  2. How fast
  3. How much stuff (matter) is in an object
  4. The change in velocity over time
Grade 12 Forces and Motion

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Weight is a measure of
  1. your mass.
  2. the gravitational attraction between you and the earth.
  3. mechanical equilibrium
  4. all of these
  5. none of these
Grade 12 Fluid Mechanics
Grade 12 Forces and Motion

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