1712C: What do we know about Newton's 3 Laws of motions? by CheeSeng Lim https://padlet.com/lim_chee_seng2/r9w6ffncflo9 You should add a comment for each column under "What we know", "Want to know" and "What we learned". You may also include your comments or likes for your friends. Remember to respect your friends and yourself when commenting. (KWL Chart) en-us 2018-07-03 02:29:18 UTC 2018-07-03 15:32:53 UTC hello@padlet.com https://padletuploads.blob.core.windows.net/prod/91810442/4eab4ab0d7f4cb776574703dd4e24fd6/giraffe_icon.svg For example: Action and reaction pairs of forces have the following characteristics; 1. equal magnitude, 2. opposite direction, 3. same type, 4. act on different body, 5. happen over the same duration. lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269215837 2018-07-03 02:29:18 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269215837 For example: Can Newton's 3 laws explain why objects move in a circle? lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269215838 2018-07-03 02:29:18 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269215838 For example: Newton's first law is about inertia. lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269215839 2018-07-03 02:29:18 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269215839 Mass and impulse lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269227356 Mass is a factor in change in momentum, and hence impulse will be affected.]]> 2018-07-03 04:56:46 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269227356 Circular motion and normal contact force lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269227602 Note that this is specific to the video you have seen. Sometimes, the net force is due to other types of forces.]]> 2018-07-03 04:59:43 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269227602 Impulse lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269229123 @Arina: Impulse is the product of F & t. So, depending on the question, if we know the change in momentum of the body, we can use its value to calculate F or t, provided one of them (F or t) is known.
@Jen Yee: Impulse happens whenever there is a collision. So, it is possible to happen in  outer space.

]]> 2018-07-03 05:26:18 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269229123 @Xi rui lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269232131 In your description for the total energy for vertical circular motion to be conserved, the condition is that its speed cannot be constant, or the circular motion is non-uniform. 
Otherwise the total mechanical energy is not conserved.

]]> 2018-07-03 06:26:53 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269232131 @Jun Li lim_chee_seng2 https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269243374 Before a rocket take off, the upwards thrust is less than its weight (downwards). There is additional normal force (upwards) to balance the forces so that the rocket is in equilibrium. This is Newton's first law.
When the rocket takes off, there is a net upwards force and it starts to accelerate. This is Newton's second law.]]> 2018-07-03 08:23:58 UTC https://padlet.com/lim_chee_seng2/r9w6ffncflo9/wish/269243374