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Energy Calculations. Energy Calculations. A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?. Given. Given. F. Formula. Work. Answer. Energy Calculations. A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?. Given. Given. - PowerPoint PPT Presentation
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Energy Calculations
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
Look for what is given.
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s
What does the problem ask for?
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s
What formula will you use to find the answer?
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2
Now, plug in the given values into the formula.
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2 Ke=½*70kg*(4m/s)2
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2 Ke=½*70kg*(4m/s)2
And solve!
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2 Ke=½*70kg*(4m/s)2
Ke = 35 kg * 16 m2 / s2 =
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2 Ke=½*70kg*(4m/s)2
Ke = 35 kg * 16 m2 / s2 = 560 kgm2/s2
Write the answer in the answer section.Do not forget the units!
Energy Calculations
• A cross-country runner massing 70 kg running at 4 m/s. What is his Kinetic Energy?
Given FGiven Formula Work Answer
m = 70 kg v = 4 m/s Ke=½mv2 Ke=½*70kg*(4m/s)2
Ke = 35 kg * 16 m2 / s2 = 560 kgm2/s2560 J
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
Look for what is given.
Enefgy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m
What does the problem ask for?
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m
What formula is required to find the answer?
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m
Gpe=m*g*h
g= 9.8m/s2
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m Gpe=m*g*h
Now, plug in the values and solve!
g= 9.8m/s2
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m Gpe=m*g*h
g= 9.8m/s2
Gpe=10 kg*9.8 m/s2*100 m
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m Gpe=m*g*h
g= 9.8m/s2
Gpe=10 kg*9.8 m/s2*100 mGpe= 9,800 kgm2/s2
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m Gpe=m*g*h
g= 9.8m/s2
Gpe=10 kg*9.8 m/s2*100 mGpe= 9,800 kgm2/s2
Write the answer in the answer section.Do not forget the units!
Energy Calculations• Calculate the Gravitational Potential Energy of
a rock that masses 10 kg at the edge of a cliff 100 meters above the ground.
Given FGiven Formula Work Answer
m=10 kg h= 100 m Gpe=m*g*h
g= 9.8m/s2
Gpe=10 kg*9.8 m/s2*100 mGpe= 9,800 kgm2/s2
Gpe = 9,800 J
