Perry Assistance for Senior Success

1
Perry Assistance for Senior Success

• Using the Science Formula Page
• And
• Calculator Help

2
The Formula Chart for Science

• On the science chart, the meanings of the letters
  in the formulas are given to you.
• You must know the measurement units to know what
  numbers fit to which letter.
• The box at the bottom provides some help . . .
  Lets look.

3
When you dont know look!

• Very important information is here.
• Example Newton which is the unit of Force is
  found by multiplying kg (mass) times m/s2 which
  is the unit for acceleration.

4
Example

• What is the net force exerted on a 90.0 kg
  race-car driver while the race car is
  accelerating from 0 to 44.7 m/s in 4.50 s?
• F 9.8 N
• G 20 N
• H 201 N
• J 894 N

We see kg, but not m/s2, so we have to calculate
acceleration first . . Acceleration Vf Vi
time A
44.7 0 9.9 m/s2 4.5 So F
90.0kg x 9.9 m/s2 893.9 N
5
Science questions some times give more
information than is needed.

• Match units to formulas on the formula page.
• Time should be in seconds in all formulas.
• Mass must be in Kilograms for Force, Momentum,
  Work and Power.
• Work and energy must be in Joules or
  Newton-meters.
• This can be overwhelming if you try to wait until
  the day before to learn them. Try flash cards
  with units and what they measure.

6

• A person pushes a large box across a level
  floor by applying a horizontal force of 200 N.
  If the person pushes the box a distance of 5
  meters in 10 seconds, how much work does the
  person do on the box?
• A 2000 joules
• B 1000 joules
• C 400 joules
• D 100 joules

XXXXXXXXXXXX

• In problems with numbers
• find the question word,
• look up the formula on the formula page,
• Cross out information you do not need
• put the numbers in the CALCULATOR in order.

Work force x distance No mention of time! or
200N x 5 m 1000 joules
7
Lets look at some related formulas . . .

• The bottom equation says Speed, but uses v in the
  equation.
• According to the top formula, v means velocity.
• Velocity is more accurate since it is speed in
  one direction.
• On TAKS these words are used interchangeably.

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Momentum mv so . . .

• 3 Which bike rider has the greatest momentum?
• A A 40 kg person riding at 45 km/h
• B A 50 kg person riding at 35 km/h
• C A 60 kg person riding at 25 km/h
• D A 70 kg person riding at 15 km/h

1800
1750
1500
1050
Just like on the Math test, plug in each answer
and see which one works (it is the largest). . .
9
Most important . . .
Do not guess, look and calculate!!