Class VII

Force of attraction between two masses is called
  1. gravitational force
  2. friction
  3. pull
  4. push
A frictional force acting on an object when it moves through air is called
  1. air resistance
  2. water resistance
  3. air pressure
  4. air condensation
Forces can
  1. speed up
  2. slow down
  3. stop
  4. all of them
To reduce air and water resistance objects are shaped in
  1. streamlined
  2. oblongata
  3. rectangular
  4. conical
Force of friction can be reduced by help of
  1. ball bearing
  2. lubricants
  3. cushion surfaces
  4. all of them
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