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Ninth Grade (Grade 9) Forces and Motion Questions

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Grade 9 Forces and Motion
The force of gravity acting on a 2-kg melon is
  1. 2 kg.
  2. 10 N.
  3. 20 N.
  4. more than 20 N.
Grade 9 Forces and Motion
Which of the following does not involve any friction?
  1. A bicycle rolling down a hill
  2. A baseball player sliding into 2nd base
  3. A diver falling through the air to a pool
  4. All of the above experience some friction.
Grade 9 Forces and Motion
What is the formula for calculating Newton's second law?
  1. f=mp
  2. m=fa
  3. f=ma
  4. m=fp
Grade 9 Forces and Motion
For an object to travel at a constant velocity, which of the following MUST be true.
  1. A constant force is being applied
  2. Any forces being applied must be balanced
  3. There can be no force of any kind applied to the object
  4. The object has positive acceleration
Grade 9 Forces and Motion
                 is the force that opposes motion between two surfaces that touch each other.
  1. Friction
  2. Rolling friction
  3. Sliding friction
  4. Static friction
Grade 9 Forces and Motion
Which of the following is NOT a vector quantity?
  1. Velocity
  2. Acceleration
  3. Force
  4. Speed
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 Forces and Motion
The rate of change of velocity is called
  1. velocity.
  2. instantaneous speed.
  3. acceleration.
  4. displacement.
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 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.
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