The Magic Chart Honors Physics Worksheet With Answers - Northern Highlands
ADVERTISEMENT
1
2
3
4
5
6The Magic Chart
Honors Physics
THE “WHO CARES” QUANTITY
“Who Cares” Quantity
Magic Chart Equations
tells you which equation to use.
For example, suppose you know
v
= v
+ a t
x
f
i
a, x, and v
but not v or t. If you
i
are looking for t, then you don't
2
x = v
t + 1/2 a t
v
i
f
care about v, so use the equation
whose “WHO CARES” quantity is
x = ½ (v
+ v
) t
a
i
f
v. If, however, you need to find v,
2
2
v
= v
+ 2a x
use the equation whose “WHO
t
f
i
CARES” quantity is t.
2
x = v
t - 1/2 a t
V
Now try these on your own:
f
i
1. You throw an object upwards from the ground with a velocity of 20m/s and it is subject to a downward
acceleration of 9.8 m/s
. How high does it go?
2
v
= v
+ 2a x
v
=20 m/s
(0 m/s)
= (20 m/s)
+ 2 (-
x=20.4 meters
f 2
i 2
2
2
Given
Formula
Set up
Solution
i
v
=0 m/s
9.8 m/s
) x
2
a=-9.8 m/s
f
2
x=?
2. You throw an object upwards from the ground with a velocity of 20m/s and it is subject to a downward
acceleration of -9.8 m/ s
. How much later does it momentarily coming to a stop?
2
v
= v
+ a t
v
=20 m/s
=(20 m/s) + -9.8 m/s
t
t=2.04 s
2
Given
Formula
Set up
Solution
f
i
v
i
=0 m/s
a=-9.8 m/s
f
2
t=?
3. You throw an object upwards from the ground with a velocity of 20m/s and it is subject to an downward
acceleration of 9.8 m/ s
. How high is it after 2.0s?
2
v
= v
+ 2a x
v
=20 m/s
=(20 m/s)
+ 2 (-9.8 m/s
)x =20.4 m
f 2
i 2
Given
Formula
2
Set up
2
Solution
a= -9.8 m/s
i
2
t=2 s
x=?
1 |
P a g e
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education