Splung.com Physics Forum Forum Index Splung.com Physics Forum
Discuss physics or ask questions. Part of the Splung.com physics web site.
 
   SearchSearch   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

using laws of motion

 
Post new topic   Reply to topic    Splung.com Physics Forum Forum Index -> Physics Help. Ask a Physics Expert
View previous topic :: View next topic  
Author Message
candace3



Joined: 05 Jul 2010
Posts: 1
Location: USA

PostPosted: Mon Jul 05, 2010 5:13 pm    Post subject: using laws of motion Reply with quote

I think I have the correct answers for the following questions but can someone just let me know if they are correct??

1. When you roll a bowling ball down the lane, it strikes the pins and continues on its path fairly uninterrupted. How can this be explained?( I choose D)

a. The bowling ball has more acceleration than the pins and it pushes on past easier.
b. The bowling pins are top heavy and so it is easy to push them out of the way.
c. The pins have more inertia than the ball and so they push aside more easily.
d. The ball has a great deal of inertia and continues its motion effectively.


2. When playing on a swing, small children quickly learn to pump the swing in the correct rhythm to make the swing go higher. Why does this work? ( I choose B)

a. The applied force and the motion are in opposite directions.
b. The applied force and the motion are in the same direction.
c. The applied force and the motion are at angles to each other.
d. It has little to do with force or motion; the rhythm "feels" right.

3. A ball attached to a string is swung around in a circle. What can be deduced from this motion?(I choose B)

a. The string applies a force to the ball pushing towards the outside of the circle.
b. The string applies a force to the ball pulling into the center of the circle.
c. The ball has inertia which is redirected into a circular path.
d. The string has little effect on the ball's motion. It moves in a circle because of the way you move your hand.
Back to top
View user's profile Send private message
hepcj
Site Admin


Joined: 23 Jun 2007
Posts: 125

PostPosted: Tue Jul 06, 2010 10:10 pm    Post subject: Reply with quote

Your answers seem correct to me.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Splung.com Physics Forum Forum Index -> Physics Help. Ask a Physics Expert All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


© Copyright 2010 Splung.com