Class VII

In systemic diagram force can be represented by an
  1. arrow
  2. plus
  3. dot
  4. star
Earth pulls object towards center causing it to fall
  1. in center
  2. on ground
  3. in air
  4. in space
Forces can
  1. speed up
  2. slow down
  3. stop
  4. all of them
A force which occurs when two surfaces come in contact and slow down motion while acting in
  1. opposite direction
  2. same direction
  3. both a and b
  4. north direction
Due to friction between moving parts of machine there is found
  1. heat
  2. light
  3. energy
  4. oil
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