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Ninth Grade (Grade 9) Mechanics Questions

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Grade 9 Forces and Motion
The speed and direction an object moves is called
  1. displacement.
  2. motion.
  3. velocity.
  4. instantaneous speed.
Grade 9 Energy and Momentum
The energy possessed by matter due to its motion is                  .
  1. potential energy
  2. kinetic energy
  3. static energy
  4. none of the above
Grade 9 Energy and Momentum
What is equal to the product of mass and velocity?
  1. inertia
  2. force of gravity
  3. weight
  4. momentum
Grade 9 Energy and Momentum
Energy in the form of motion is
  1. potential energy.
  2. chemical energy.
  3. kinetic energy.
  4. mechanical energy.
Grade 9 Energy and Momentum
The energy of a moving object is
  1. kinetic energy.
  2. potential energy.
  3. chemical energy.
  4. nuclear energy.
Grade 9 Forces and Motion
The rate of change of velocity is called
  1. velocity.
  2. instantaneous speed.
  3. acceleration.
  4. displacement.
Grade 9 Energy and Momentum
Grade 9 Energy and Momentum
Which of the following is not used to calculate potential energy?
  1. mass
  2. height
  3. gravitational acceleration
  4. speed
Grade 9 Forces and Motion
In the acceleration formula, Vf represents
  1. the acceleration.
  2. the initial velocity.
  3. the final velocity.
  4. the direction.
Grade 9 Forces and Motion
A single point on a distance/time graph shows the
  1. constant speed.
  2. instantaneous speed.
  3. velocity.
  4. acceleration speed.
Grade 9 Energy and Momentum
Kinetic energy depends on what?
  1. speed and mass
  2. mass and velocity
  3. mass and distance
  4. distance and speed
Grade 9 Forces and Motion
What is gravitational acceleration?
  1. acceleration due to gravity
  2. acceleration due to air resistance
  3. acceleration due to velocity
  4. acceleration due to speed
Grade 9 Forces and Motion
Consider your book is at rest on a table. When you push it horizontally and it's on the verge of sliding, but still at rest, friction on the book acts in a direction that is
  1. opposite to your push.
  2. the same direction as your push.
  3. at right angles to your push.
  4. in no direction until the book slides.
Grade 9 Forces and Motion
Ball A is a 1.50 kg ball moving at 8.00 m/s south. It strikes Ball B, a 2.00 kg ball moving at 3.00 m/s south. The velocity of Ball B after the collision is 4.50 m/s south.

What is the momentum of Ball A before the collision and after the collision?
  1. 12 before the collision, 12 after the collision
  2. 18 before the collision, 12 after the collision
  3. 12 before the collision, 9 after the collision
  4. 20 before the collision, 0 after the collision
Grade 9 Forces and Motion
The upward force of an object falling through the air is
  1. terminal velocity.
  2. rolling friction.
  3. gravitational acceleration.
  4. air resistance.
Grade 9 Forces and Motion
Grade 9 Forces and Motion
The acceleration of a rain drop that falls at constant velocity
  1. is zero.
  2. is directed downward.
  3. decreases over time.
  4. increases over time.
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