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The sentence or statement is true or false.If false, change the identified word to make the sentence true? |
1.Earth exerts an UNBALANCED force on a ball thrown in the air_______ 2.If a net force acts on an object, the object may change spped, change direction or do NEITHER.________ 3.BALANCED force acting on an object cause the object to accelerate.______ 4.Friction is a force that SPEEDS UP motion between two surfaces that are in contact.________ 5.Cars, airplane wings, and bike helmets are built in a streamlined shape to reduce INERTIA._______ 6.An object with a mass of 9.0kg has an acceleration of 3 m/s.The force acting on it is 3N.______ 7.The outward force from a surface is the NET force._______ 8.Forces always exist ALONE 9.The acceleration of an object IS ALWAYS IN THE DIRECTION OF the net force acting on it._______ 1. true 2. true 3. false, UNBALANCED 4. false, SLOWS DOWN 5. false, DRAG 6. false, 27N (N=kg*m/s^2) (I assume you meant that the acceleration was 3 m/s^2) 7. false, but I don't know how to make that one true. Maybe EXERTED? 8. true 9. true balanced both true slows down aerodynamic drag ? true true the opposite direction 1.Earth exerts an UNBALANCED force on a ball thrown in the air. TRUE 2.If a net force acts on an object, the object may change speed, change direction or do NEITHER. FALSE: Both (A net force is an unbalanced force and unbalanced forces always cause acceleration. Acceleration is any change in velocity. Since velocity is both speed and direction than any change in speed or direction is a change in velocity. Thus acceleration occurs whenever there is a change in either speed or direction. If you travel in a circle at a constant speed you are accelerating!) 3.BALANCED force acting on an object cause the object to accelerate. FALSE Unbalanced (Or, as mentioned above, Net force) 4.Friction is a force that SPEEDS UP motion between two surfaces that are in contact. FALSE slows down 5.Cars, airplane wings, and bike helmets are built in a streamlined shape to reduce INERTIA. FALSE drag or air resistance (However, the shape of an airplane wing is such that it will produce lift.) 6.An object with a mass of 9.0kg has an acceleration of 3 m/s^2.The force acting on it is 3N. FALSE F = ma so F = 9kg x 3m/s^2 = 27N 7.The outward force from a surface is the NET force. FALSE normal (This is the force that is always perpendicular to the surface.) 8.Forces always exist ALONE FALSE! According to Newton's third law every force has an equal and opposite force. Thus, forces always act in pairs. (Imagine that! There is no such thing as a single force!) 9.The acceleration of an object IS ALWAYS IN THE DIRECTION OF the net force acting on it. TRUE! Alright, there are some wrong answers in both responses so far. Here are the right ones: 1) true. the unbalanced force is the force of gravity, which will cause the ball to eventually fall because it is not balanced. 2) False. A net force causes either a change in speed or direction or BOTH. 3) False. UNBALANCED (or net) forces cause acceleration 4) False. SLOWS DOWN. 5) False. AIR RESISTANCE. 6) False. 27N (F (in newtons)=M (in kg)*A (in m/s^2) 7) False. the force perpendicular to (i.e., outward from) a surface is the NORMAL force. 8) False. IN PAIRS (Newton's 3rd law) 9) True. |
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