1) Force is a magnitude which unit is... a) joule (J) b) newton (N) c) m/s2 d) galileo (G) 2) Two bodies must be interacting for a force to exist a) True b) False 3) The effect a force produces is.. (choose all the correct answers) a) Deformations b) Changes in motion c) Turns d) Brakes e) Falls 4) Indicate which of the following are distant forces a) Friction force b) Pool balls hitting each other c) An apple falling from an apple tree d) Magnetic force e) Push a car f) Hit a beisball 5) Indicate which of the following are contact forces a) Friction force b) Pool balls hitting each other c) An apple falling from an apple tree d) The force between the Sun and the Earth e) Push a car f) Hit a beisball 6) If several forces are acting on a body, they combine into a single force, called net force a) True b) False 7) Considering F1= 5 N, and F2= 8 N, the net force will be... a) 3 N b) 13 N c) 40 N 8) Considering the diagram, the net force is... a) 8 N to the left b) 8 N to the right c) 16 N to the left d) 16 N to the right 9) Forces are vectorial magnitudes a) True b) False 10) First Newton's law is... a) Law of inertia b) Action and reaction law c) Gas law d) Charles law 11) Second Newton's law is expressed by the equation... a) F= m . a  b) F = v . t c) F = m / a 12) If we want a 10 kg body to accelerate with 2 m/s2, we will have to push it with a force of a) 40 N b) 5 N c) 10 N d) 20 N

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