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Ninth Grade (Grade 9) Mechanics Questions

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Grade 9 Forces and Motion
In the picture, the dark colored box is moving toward the light colored box and a collision occurs. Which of the following describes what happened?
Collision #1
  1. The momentum of the dark box was transferred to the light box.
  2. The dark colored box applied a force to the light colored box during the collision, causing it to accelerate.
  3. The light colored box applied a force to the dark colored box during the collision, causing the dark colored box to accelerate.
  4. All of the above are correct.
Grade 9 Forces and Motion
The friction that opposes two surfaces sliding past each other is
  1. rolling friction.
  2. static friction.
  3. sliding friction.
  4. mass friction.
Grade 9 Forces and Motion
The friction between two surfaces that are not moving past each other is
  1. sliding friction.
  2. static friction.
  3. gravitational friction.
  4. rolling friction.
Grade 9 Forces and Motion
The size of two objects gravitational force depends on
  1. mass and velocity.
  2. velocity and air resistance.
  3. mass and distance.
  4. distance and velocity.
Grade 9 Energy and Momentum
The momentum after a collision of two objects is explained using the
  1. law of inertia.
  2. law of momentum.
  3. law of acceleration.
  4. law of conservation of momentum.
Grade 9 Forces and Motion
How can the gravitational potential energy of an object be changed?
  1. by height
  2. by speed
  3. by distance
  4. by weight
Grade 9 Energy and Momentum
What is the unit used for momentum?
  1. kg*m/s
  2. kg*s/m
  3. ml*m/s
  4. ml*s/m
Grade 9 Energy and Momentum
What is the formula for momentum?
  1. f=ma
  2. w=ma
  3. p=mv
  4. v=pm
Grade 9 Energy and Momentum

This question is a part of a group with common instructions. View group »

What best describes the type of energy provided by the rubber band as it is stretched?
  1. Gravitational Potential Energy
  2. Kinetic Energy
  3. Thermal Energy
  4. Elastic Potential Energy
Grade 9 Energy and Momentum
A small motor does 4000J of work in 20 seconds. What is the power of the motor in watts?
  1. 0.005 Watts
  2. 80,000 Watts
  3. 200 Watts
  4. None of the Above
Grade 9 Forces and Motion
An object in free fall undergoes an increase in
  1. speed, only.
  2. acceleration, only.
  3. both speed and acceleration.
  4. none of the above.
Grade 9 Forces and Motion
When you push with a horizontal 15-N force on a book that slides at constant velocity, the force of friction on the book is
  1. zero.
  2. slightly less than 15 N.
  3. 15 N.
  4. slightly more than 15 N.
Grade 9 Forces and Motion
If object A has a mass of 10 kg and object B has a mass of 20 kg, and both are dropped from the same height (not considering air resistance), which of the following will be true?
  1. Object B will experience a stronger force of gravity, but both will have the same acceleration.
  2. Object B will experience a stronger force of gravity, and therefore more acceleration.
  3. Both objects experience the same force of gravity, but object A will accelerate faster because it has less inertia.
  4. Both objects experience the same force of gravity, but object B will accelerate more because it has more mass.
Grade 9 Energy and Momentum
Imagine an object held at some height above the ground. It is released and falls toward the ground. Ignoring air resistance or friction, which of the following must be true?
  1. Before it falls, all of its energy must be potential energy.
  2. At the end of its fall, all of its energy must be converted to kinetic energy.
  3. During its fall, the combination of its kinetic and potential energy must equal the amount of potential energy with which it started.
  4. All of the above are true?
Grade 9 Energy and Momentum
What causes mechanical energy to change to thermal energy?
  1. air resistance and friction
  2. friction and conservation
  3. conservation and air resistance
  4. energy and friction
Grade 9 Energy and Momentum
Which of the following is not used to calculate kinetic energy?
  1. mass
  2. weight
  3. height
  4. speed
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