1) When two equal forces act on an object:  a) The object moves according to the greater force. b) The object does not move, the sum of forces is equals zero. c) The object explodes. d) The object moves due to the gravity. 2) Why does the object remain still? a) Because it is very heavy. b) Because there is more mass than force. c) Because the forces are in equilibrium. d) Because the object is an alien. 3) Who will win? a) Noboby; the forces are in equilibrium. b) The left team because is the strongest. c) The right team because is the strongest. d) None of the above. 4) The force that keeps you walking on earth instead of floating into space is called: a) gravity force. b) friction force. c) nuclear force. d) electromagnetic force. 5) Who discovered gravity? a) Isaac Newton. b) Albert Einsten. c) Marie Curie. d) Thomas Edinson. 6) What happens if we try to face two equal poles of two magnets?  a) They will attract each other. b) They will explode. c) The will repel each other. d) They will go to space. 7) Why do magnets repel when we try to face their equal poles? a) Because of a friction force acting on them. b) Because of the magnetic force acting on them. c) Because of the nuclear force acting on them. d) Because magnets are magical objects. 8) What would happen if there was not a nuclear force? a) Nothing. b) There would not be atoms, compounds, molecules or matter, so the universe would not exist. c) We would float into space. d) The planets would explode.

Force and motion

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