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BGE Forces topic

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  • Contact forcesonly act when two objects or materials are touching. An example of a contact force is:
    Weight (gravity force)
    Friction
    Static electric force.
    Magnetic force
  • The unit for measuring force is the newton (N).
    False
    True
  • Friction can be reduced by using smooth surfaces, or by lubrication. Which material could help reduce friction?
    Rubber
    Oil or Grease
    Glue
    Sand
  • Friction is a contact force. Friction can
    Cool objects down
    Cause arguments
    Make objects move faster
    Slow objects down
  • Gravitational field strength is the size of the gravity on every kilogram of mass.This is different on every planet.
    False
    True
  • Balanced forcesare forces on an object that are the same size but work in opposite directions. If forces are balanced:
    A stationary object stays stationary
    Astationary object will start to move
    A moving object will change its speed or direction.
  • Mass is a measure of how much matter an object is made of.The unit of mass is the kilogram (kg).
    True
    False
  • The weight of an object can be calculated using the formula: W=mg What is the Weight of a 10kg bowling ball on Earth
    50N
    100N
    10N
    5N
  • Forces are pushes or pulls. Forces can:
    ● change the speed things are moving (make them move faster or slower)
    All of these
    ● change the shape of an object
    ● change the direction of a moving object.
  • Friction can be increased by using rough surfaces, or by using materials such as rubber that have a lot of friction.
    False
    True
  • Non-contact forces can have an effect without objects touching. Which example is NOT a non-contact force?
    Air resistance
    Static electric force.
    Magnetic force
    Weight (gravity force)
  • The gravitational field strength on Earth is 10 N/kg
    False
    True
  • Which of the following examples would you not want increased friction ?
    Ice Skating
    Scubadiving
    Car racing
    Skydiving
  • A boat floats because its weight and the upthrust from water are balanced.
    True
    False
  • The force of friction produced by the air is known as ...?
    Resistance is futile
    Air resistance
    Oxygen friction
    Water resistance
  • A force can be measured with a force meter.
    False
    True
  • Weight is the size of the force of gravity on an object.The unit of weight is the newton (N)
    False
    True
  • Streamlining involves changing the shape of an object to make the force of friction as small as possible.
    False
    True
  • Friction is a force caused by two things rubbing together. What example is NOT an example of Friction?
    <b>Air resistance</b>
    An image reflected on a mirror
    A hummingbird hovering mid flight
    <b>water resistance</b>
  • If there are unbalanced forces on an object:
    A moving object continues to move at the same speed
    A stationary object will start to move
    A stationary object stays stationary
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