Friday, February 12, 2010

Plz help me with these true or false?

1. True False - If two objects have the same acceleration, they are under the influence of equal forces.


2. True False - An object's velocity will change if a net force acts on the object.


3. True False - If a net force acts on an object, the object's velocity will change.


4. True False - An object initially moving at a constant velocity will slow down unless net force is applied.


5. True False - If an object's speed does not change, no net force is acting on the objectPlz help me with these true or false?
1. False. acceleration = Force/mass. It depends on both. If the two objects had different masses, they would require different forces





2. True. Force = mass*acceleration. Acceleration is a result of force. And acceleration is defined as a change in velocity.





3. True. This is actually the same as 2.





4. False. It will never stop moving. The only way to slow it down IS to apply a net force (against the direction of movement)





5. False. An object that is accelerating must have a net force on it. However, an object may accelerate without having its speed change. Recall that velocity is a vector quanity, with speed as its magnitude. Even if the direction of velocity changes (but not the magnitude), the object is accelerating, and a net force is be present.

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