Homework Help: Physics

Posted by Hannah on Saturday, November 7, 2009 at 4:46pm.

Hi, I had some questions about Physics and Newton’s Three Laws of Motion and was wondering if someone could possibly help me. Some of the questions I wasn’t sure about the answers.

#1 Write out in words what “acceleration ~ net force” means.
My Answer: I think it means that acceleration is directly proportional to net force.

#2 True or False: On Earth the mass and weight of an object are the same.
My answer: False

#3 In space, would an object with a weight of 20 Newtons or an object with a mass of 2 kilograms have more Inertia?
My Answer: They would have the same inertia or
The object with a mass of 2 kilograms (I wasn’t sure.)

#4 True or False: For the same net force on an object, less mass means more acceleration.
My Answer: False

#5 True or False: The quantity 1/10 is less than the quantity 1/100. WHY?
My Answer: False, both quantities are the same?! (I was really confused by this question.)

#6 True or False: All free-falling objects have the same force/mass ratio and undergo the same acceleration at the same location.
My Answer: False

Thank you guys so much. I have a huge test over this next week and I still don’t think I’ve grasped the whole idea behind all of these concepts. Physics isn’t my best subject and if anyone knows any good websites that can help me out, I would really appreciate it.

Thank You So much Again -Hannah-

Physics - Nikki, Saturday, November 7, 2009 at 6:02pm
A sled is dragged along a horizontal path at a constant speed of 1.5m/s by a rope that is inclined at an angle of 30 degrees with respect to horizontal. The total weight of the sled is 470N. The tension in the rope is 240N. How much work is done by the rope on the sled in a time interval of 10.0S?

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