Energy Calculations

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