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Unit 4. Forces and Motion

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  • Rubbing two surfaces together produces which type of energy? [choices: A. chemical, B. electrical, C. heat]
    C.heat
  • The amount of matter in an object is called ___________ . [Choices: A. force, B. mass, C. weight]
    B. mass
  • The picture shows two forces acting on a box in opposite directions. How much will be the net force? [choices: A. 0 Newtons, B. 20 Newtons, C. 4 Newtons]
    C. 4 Newtons
  • What will be your mass in outer space if your mass on Earth is 45 kilograms? [choices: A. 450 kilograms, B. 0 kilograms, C. 45 kilograms]
    C. 45 kilograms
  • A box is pushed by two persons. The image shows the forces they produced. How much is their net force? [choices: A. 0 Newtons, B. 40 Newtons, C. 20 Newtons]
    B. 40 Newtons
  • What is the type of force that is produced in this object when you pull it on both sides?
    Spring force
  • What type of force your body produce when you push something? [Choices: A. friction force, B. tension force, C. applied force]
    C. applied force
  • The pull of gravity on an object is called ___________ . [Choices: A. weight, B. energy, C. mass]
    A. weight
  • What type of force is produced when two objects rub together?
    friction
  • What is the name of the force by air particles which fights the pull of gravity on a falling object?
    Air resistance force
  • A lubricant such as oil makes surfaces slippery. That means it can _____________ the friction between 2 rubbing objects. [choices: A. increase, B. decrease]
    B. decrease
  • TRUE or FALSE: Gravity is a kind of energy.
    FALSE. It is a kind of force.
  • If you put a ball on the ground and it does not move, the forces acting on it are ____________ . [choices: A. balanced, B. unbalanced]
    A. balanced
  • Which among the three is the unit used to measure weight? [grams, newtons, kilograms]
    newtons
  • TRUE or FALSE: the smoother the surface, the more friction it will produce.
    FALSE: the lesser friction it will produce.
  • What type of energy is inside this cake? [ choices: A. chemical, B. mechanical, C. Thermal]
    A. chemical
  • TRUE or FALSE: If your weight on Earth is 650 N, your weight in outer space would be 0 N.
    TRUE. You don't have a weight in outer space.
  • The 2 forces acting on an object in opposite directions is called a ___________ .
    force pair
  • You blow a pingpong ball and it rolled across the table. Is there work done on the pingpong ball? [Yes or No]
    YES
  • TRUE or FALSE: The wider a parachute is the slower it is to fall to the ground.
    TRUE
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