Grade 12 Physics Exam Review

1. A 40 kg wagon is pulled with an applied force of 50 N [E 37degrees above the horizontal. The wagon moves 8 m [E]horizontally while 5 N of friction act. Find the work done on thewagon by the...

•

a) applied force b) net force c) friction forced) force of gravity

2. State the formulas for...

a) gravitational potential energy near the earth's surface

^

-*4-

g)n)

4.

. .

••••ik&fM3 J ' . £•

orbital speedgravitational field strength on the surface of a planet

A 4..a 2

the

K \

kg ball moving at 5 m/s [E] collides head-on and elastically wit!kg ball moving at 4 m/s [W]. Find the velocity of each ball aftercollision.

^f^S^^^^C^^^^^^

page #2

Two loudspeakers are producing circular waves of 7 meterwavelength in phase. A person on the sixth nodal line is 50 metersfrom one source. What are the possible distances of the personfrom the other source.

A spring is compressed 8 cm using a steady force of 64 N. What isthe Hooke's force constant for the spring?

•

Derive the alternate form of Newton's second [aw.

A- 3 kg ball is moving at 8 m/s [N30W] when it hits another 6 kginitially at rest, the 3 kg ball glances off at 4 m/s [N53W]. Find themomentum anf the velocity of the 6 kg particle.

11. A Hooke's law spring is compressed 10 cm by an applied force of50 N. The compressed spring is then used to project a 20 g marblestraight up into the air. To what maximum height does the marblerise?

12. A 3000 kg car moving at 30 m/s [E] takes 10 sec to turn a corner.The final velocity of the car Is 40 m/s [N]. Find the accelerationand net force on the car.

13. Write the vector chain rule for air navigation and river-crossingquestions and review note and homework examples.

Find the acceleration and tension in the following system ifa) there is no frictionb) the coefficient of friction between incline and block is 0.2

page #3

15. What minimum coefficient of static friction is necessary to keep thesystem in #14 at rest?

•16. A 30 degree incline has a block on it. What is the minimumum

coefficient of static friction between block and incline to keep theblock at rest on the incline?

17. A 60 kg lady is on the surface of a planet which is four times theearth's radius and six times the mass of the earth. How much doesshe weigh in Newtons?

1 8. For uniform circular motion, statea) the direction of the instantaneous velocityb) the direction of the acclerationc) wTiy there is accelerationd) the 3 formulas for the size of the centripetal acceleratione) what the centripetal force is

19. Find the acceleration of a girl on the edge of a merry-go-round ofdiameter 10 m moving at a constant speed of 36 km/h. :

20. What frequency is needed to produce a 9.8 m/s/s centripetalacceleration in a washing machine if the radius is 30 cm?

21. A 4 kg stone is being twirled in a vertical circle at a constant speedof 5 m/s and with radius 1.00 m.

a) What is the actual weight of the stone?b) What is the centripetal force required?c) What is the magnitude of the tension force at..

i) the top of the circle ii) the bottom of the circled) What is the minimum speed that the stone must be twirled just to

go around a circle of this radius?

22. Review conservation of linear momentum, particularly the frog.Iiliypad and coupling collisions examples from the notes.

an orbital radiuo eM-PO million km uuil irpeiiuil uf 400 ilays»!"'""" " - thTr rlnn-t, [ I m ' ¥':"i -"rr-Tf f ' i '" • -f *Mn nv'f'f—i u"i _

a) thP pg"**"* nf plamrt-

page#4

Blue light of wavelength 420 nm passes through two very narrowslits. A Young's diifraction pattern Is observed on a screen 5 maway. The distance between the first and fifth nodal line is 8.0 cm.What is the separation between the two slits?

A cannonball is projected off a 120 m high cliff at a speed of 130m/s at an angle of 22.5 degrees to the horizontal.

How long is the cannonball in the air?what is the maximum height of the cannonball above the ground?What is the total velocity of the cannonbail just before it hitsground?

Review all conservation of mechanical energy and conservation ofmomentum problems. Review the bullet-sandbag problem.

GOOD LUCK!!

.f = £N [j J

- W -" T T T d ^ ~

or

Ta.l-io-a*j: -.J_ /*- JV^J

#7

-w^f

' C

E-fyia n

4 Tm, ygyConst T^f,

J

Zo

y, =r c^-^^

rn

trVT^-

^F^,

VVs /

1v\

VIM

- spl.- ,

^1

k i_.

o-1 J

°t? ^4 vi

jQt/

P "i/-

-ACl tZ

V .n

0 ^J-1 .1. h

^

'i:\

^s

+,AH • S

\\

A>

(^

' )

k,

dC

-1

"><r

~so

*•

J>W*- j

)

^--C-

v>I'^v*

v3;

<*."

!

?

k

l^>

+

^M

It

X^X"

^

C"•jr

LL

\

^

^

?

o

&

&.

P•$

•fa

:*F

-A4

^

A'

O

H<j

i

t);

1

I

e

L^n

K'

I'fc

^

£it

<§•^ »}

-*P

3

„**"...X:fc*-.

M

6.Jp

^

f

• :;

#>HL/

irtMV

u

L ;, :-

^

J JN*p.

•

"2:J

3.it

<D

-P

r•

•«i

•v

> ^^

'1

Q

\ *\XH

»

> • •0

i .— '~~\ '

liori

•»*«

k-

;

)

C^s[-1 1/%if)

o3~

4-

r^•<»&.•i.i

^

^-? .

3T->

j

*

" 'y^L&ty\»

]:}

, .

,•'

*

1l«

Bf'

\y^>

'X

•

**«\Jrc*

wi 2a4-

>

J

m

A•<a

/vvT<C

\cu/ I

->

Vrrf-itof~VV

~J

\~3r1^s

/

' J

"2

^ha"

> JT.1

1 i

rk

rt-

po.

p

rvz

IX

it

1 1'A

vj ;

o

Ri

k it-t» ! J 'J i

l-ii

o-io-yi^_ O a -

'v-to

&itsA—*tv / fzrr t j <» r< ^

r

\-C.

- JOd

-t

f-H*

44d. £_^

LL^J ^^*> (AKi/ ........ :r.

\

&fj- *<^-,~" "^ - '•• ' ".-c.- g-v4~

\ s^?^— T -Ho -^-

T -^T' -^^j HS ^.- , -frffVt vw /

^'•Wrf

\M 4 V f t^A

£ 1 L&fM tirt^ lAf--'f*&Ti

*?aUgr^ •' A\ h 7~o ^ -^P

1"V,

r

r"^^Tr£?