1) Friction is a, Contact force, Non contact force, Either contact or non contact, Neither contact nor non contact, Friction always, Increases motion, Decreases motion, Either increases or decreases, None of these, We cannot walk without friction, True, False, A rolling ball stops after sometime, it is due to , Gravitation force, Frictional force, Electrostatic force, None of these, There is no frictional force in space., True, False, When the surfaces of two objects come into contact, the force that is produced is called, gravity, friction, A ...................... force does not produce motion., balance, unbalance, The force of gravity causes objects and people to be able to____________________., float through the air, fall to the ground, The heavier the object you want to move, the ...................... force you need to exert., more force, less force, ...................... is the force of gravity acting on objects, magnetism, weight, The force of gravity acts at a distance?, True, False, In zero gravity, objects and people appear to have no weight because they are not attracted to the ground., True, False, Sand produces less friction than an ice rink., True, False, Friction decreases the speed and motion of objects., True, False, The less mass an object has, the more gravity acts on it., True, False.

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