Class IX

The force with which the earth attracts the bodies towards its center is called
  1. Mass
  2. Inertia
  3. Weight
  4. Gravitational force
A force acting on a body of mass 7 kg produces an acceleration of 10 ms⁻². The acceleration that the same force will produce in a body of mass 9 kg will be
  1. 5 ms⁻²
  2. 6 ms⁻²
  3. 6.7 ms⁻²
  4. 7.7 ms⁻²
The friction offers by a slippery ground is
  1. Circular
  2. Very high
  3. Very little
  4. Very difficult
The resultant of all the forces acting on a body is called
  1. Net force
  2. Net friction
  3. Net velocity
  4. Net momentum
If the string is stretched by two opposite forces of 10 N then tension in string is
  1. 5N
  2. 10 N
  3. 20 N
  4. zero
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