I am taking General Physics for the first time and have an exam over Kinematics

Question

I am taking General Physics for the first time and have an exam over Kinematics in one-dimension and two-dimensions.

My question now is, in your opinion, what are the tricky words I have to remember to not mess up my answers? (e.g. deceleration means "slowing down", but it could either have a negative or postitive accelaration depending on which direction an object moves).

I can do the Math just fine, it's the sneaky terminology that gets me.

The more answers, the merrier! Thanks for your input!

Explanation / Answer

Solution:

Being a Teacher of physics i would say there isn't like tricky words. You just have to understand the meaning but as you asked i would help as much as i can. let me start with the basics.

1) Displacement ( Means Shortest distance or distnace between initial and final point) example if an object started form point A and returns back to A after completing any number of turns then displacement should be zero as diplacement is distance between initial and final point.

2)Average velocity ( Here what students do is they just find average of two velocity that might not always work) you should remember Average velocity is ratio of total displacement and total time.

3)intantaneous velocity : ( Given a graph between displacement and time they might ask you instantaneous velocity) so here you just can find slope of displacement time graph and that will give you intantaneous velocity and same applies for intantaneous speed.

4)Important one: Area under velocity time graph will give you displacement, slope of displacemnt time graph will give you velocity.

5)Deaccleration and retardation both are same and in that case you take acceleration as negatvie ( you mentioned)

6)Whenever someone(person) drops a ball ( or object) just take its intial velocity as zero.

7) When the object is thrawn up take g (acceleration due to gravity) as negative.

8) Constant velocity implies acceleration is zero.

9)Whenever a ball(or object) is thrawn up take g as negative and at highest point velocity will be zero so you can take final velocity as zero.(in question they will not say that final velocity is zero)

10)Parachutist question(famous one) : whenever a body is dropped from moving plane then its intial speed is not zero (as mentioned in point 6) its speed is equal to the speed of plane.

11) Ballon question ascending going up with some speed , descending gowing down with some speed.

12)You must also keep in mind that velocity, displacement and acceleration are vector quantity so while finding resultant you must use vector algebra.

13)Centripetal acceleration: Acceleration acting on object undergoing uniform circular motion.

At last you should know three formulas atleast

v = u + a*t

s = ut + 0.5 a t^2

v^2 - u^2 = 2as

if you have any problem with any point please comment.

please rate. Thanks.

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