Posted by mysterychicken on Sunday, May 3, 2009 at 12:36pm.
These are multiplechoice questions:
1.How much work is accomplished when a force of 300 N pushes a box across the floor for a distance of 100 M?
A 300 N
B 30,000 N
C 300 J
D 30,000 J
I chose D
2.How do simple machines make work easier?
A They change the strength or direction of a force
B They apply force quickly
C They decrease the power available
D They maintain the distance of a force
I chose A
3.What has changed when a gardener uses a lever to lift a rock, instead of lifting it by hand?
A More force is applied over the longer distance
B Less force is applied over a longer distance
C More forcec is applied over a shorter distance
D Less force is applied over a shorter distance
I chose D...?
4.Liz is on a swing. When Liz approaches the highest point, what is true about her potential and kinetic energy?
A Potential and kinetic energy are equal.
B Potential and kinetic energy are at zero.
C Potential energy is at lowest, and kinetic energy is at highest
D Potential energy is at highest, and kinetic energy is at lowest.
I wasn't sure about this one but I chose C
5.When the temperature of an object increases, what happens to the kinetic energy of the particles in the object?
A It decreases
B It increases
C It is conserved
D It equals zero
I think it might be A or B...
Thanks so much!!
MC

Physical Science  drwls, Sunday, May 3, 2009 at 1:12pm
You are correct with 1 and 2. You are wrong with 3 and 4, and should try to give each problem more thought. One of your answers for 5 is right and the other is wrong. You seem to me taking wild guesses instead of thinking about what potential energy and temperatiure really means.

Physical Science  mysterychicken, Sunday, May 3, 2009 at 1:32pm
OK, I've been trying my best and for 3 I got B and for five I got B...? 4 still seems really tricky to me!
MC

Physical Science  drwls, Sunday, May 3, 2009 at 3:02pm
3B is correct
4. Potential energy increases with height above the ground. At the top of the swing, the velcoity is zero.
5. When heat is added to a mass (and the temperatuire rises), that energy must go somewhere. It goes to make the molecules move faster.

Physical Science  mysterychicken, Sunday, May 3, 2009 at 3:59pm
THANK YOU!!
MC

Physical Science  mysterychicken, Sunday, May 3, 2009 at 4:10pm
So number 4 is actually D
MC

Physical Science  drwls, Sunday, May 3, 2009 at 7:20pm
Yes!

Physical Science  Madi, Thursday, October 22, 2015 at 12:45pm
30,000N
work=force times distance
300 times 100= 30,000

Physical Science  Amazonian Science Showers, Wednesday, March 9, 2016 at 12:40am
If you are confused on one and you cant find the answer on a website, go into the lesson again or look in your text book if you have one.
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