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Ninth Grade (Grade 9) Mechanics Questions

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Grade 9 Energy and Momentum
Walking converts what type of energy into mechanical energy?
  1. chemical
  2. electromagnetic
  3. nuclear
  4. thermal
Grade 9 Energy and Momentum
Fossil fuels currently account for the majority of the world´s energy use because they are                                             .
  1. distributed evenly throughout the world
  2. nonpolluting
  3. relatively inexpensive and readily available
  4. renewable energy resources
Grade 9 Forces and Motion
Which of the following types of motion is predominant in the molecules of a gas sealed in a tube?
  1. rectilinear
  2. random
  3. circular
  4. oscillatory
Grade 9 Forces and Motion
Which of the following is an example of a pulling force?
  1. dragging a dog sled
  2. throwing a baseball
  3. hitting a golf ball
  4. slamming the car door
Grade 9 Energy and Momentum
One watt equals one                 .
  1. newton
  2. newton-meter
  3. meter per second
  4. joule per second
Grade 9 Forces and Motion
Which of the following is the reason for banking of racing tracks?
  1. To obtain greater speeds
  2. To prevent side-slip
  3. To maintain vertical equilibrium
  4. To prevent frictional forces
Grade 9 Forces and Motion
Torque is the product of
  1. radial distance and rotational speed.
  2. lever arm and force.
  3. mass and velocity.
  4. none of the above
Grade 9 Forces and Motion
The distance traveled by a freely-falling body is proportional to
  1. the mass of the body.
  2. the square of the acceleration due to gravity.
  3. the square of the time of fall.
  4. the time of fall.
Grade 9 Forces and Motion
An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?
  1. The resistant of the parallel in zero
  2. The algebraic sum of all moments of the forces in zero
  3. All the parallel forces must be equal in magnitude and direction
  4. The sum of the forces in one direction must be equal to the sum of the forces in the opposite direction.
Grade 9 Forces and Motion
Why do roads are banked round curve?
  1. So that the centre of gravity of the vehicle will be low.
  2. To prevent vehicle from skidding of the road.
  3. To reduce the capital force.
  4. To prevent tires from wearing away too fast.
Grade 9 Fluid Mechanics
A large truck passes a car on the highway. According to Bernoulli's principle, which of the following should occur?
  1. Pressure decreases between the vehicles, so the car and truck move slightly apart.
  2. Pressure decreases between the vehicles, so the car and truck move slightly together.
  3. Pressure increases between the vehicles, so the car and truck move slightly apart.
  4. Pressure increases between the vehicles, so the car and truck move slightly together.
Grade 9 Fluid Mechanics
Two tall buildings are separated by a narrow alleyway. On a windy day, wind gusts move very quickly through the alley. If the buildings are not constructed properly, which of the following could be a concern when this occurs?
  1. The buildings' windows could be blown outward into the alley because of air pressure differences.
  2. The buildings' windows could be blown inward into the building because of air pressure differences.
  3. The buildings' windows could be blown outward into the alley because of temperature differences.
  4. The buildings' windows could be blown inward into the building because of temperature differences.
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