1. Rockets continued!

2. Remember to look for the fish!

3. PE KE
Heat
Kinetic
You were then asked to come up with an equation for all the energy transferred at the end
Energy Transferred
You were asked to draw all the energy involved in your rocket – remembering the law of conservation of energy. Is This accurate? OR
Intro
Activity 1
Notes 1
Notes 2
Activity 2
Closing
End

4. Text in your group’s equation
Activity 1
Notes 1
Notes 2
Activity 2
Closing
End

5. So what we were finding the equation for is…
What we call Mechanical Energy. It is:
The energy possessed by an object due to it’s motion OR its position. So the total energy an object could posses.
Ex A basketball
It also enables an object to apply a force to another object in order to cause it to be displaced.
Ex. Bowling
Notes 1
Notes 2
Activity 2
Closing
End

6. The equation for Mechanical Energy is simple:
Because Mechanical Energy is basically the total energy an object can possess, both kinetic and potential … it is the sum of potential and kinetic energies, including heat and friction.
So ME = PE + KE
Notes 2
Activity 2
Closing
End

7. How much mechanical energy is this man using to displace the water in the creek?
Activity 2
Closing
End

8. How much mechanical energy is he applying to the surface of the water?
Let’s assume that the man weighs 68 kg. Let’s give him the benefit of the doubt and say he was as fast as an Olympic pole vaulter at 8.3 m/s.
Let’s assume when he slips, he is only 0.5 m above the water’s surface,
How much mechanical energy is he applying to the surface of the water?
ME = PE + KE
ME =
PE = mgh KE = ½mv2
PE = KE =
m = m =
g = v =
h =
PE = mgh KE = ½mv2
PE = =
= = = ? ? ?
68 kg
68 kg
9.8 m/s2
8.3 m/s
0.5 m
68kg x 9.8m/s2 x 0.5m
666.4 x 0.5
333.2 J
½ x 68kg x (8.3m/s)2
½ x 68kg x 68.89
34 x 68.89 J
ME = PE + KE
PE = J KE = J
ME = J J
= J
That means he hit the water with about the same force as a punch! Or the force that a champagne cork leaves a bottle with!
Activity 2
Closing
End

9. We’re continuing with your rockets now
We’re continuing with your rockets now. But we need to add in the more ‘mathy’ bit
Today you in your rocket groups will be finding the total (mechanical energy) of your rockets. Read your instructions carefully!
Make sure everyone in your group knows what they will be doing/measuring!
Closing
End

10. To the rocket Major Tom!
End