MORE ME GPE AND KE

What form of energy does an object gain when it is lifted to a height above the ground?

(a)  

What form of energy does an object have because it is moving?

(a)  

Which of the following equations shows how mechanical energy is related to gravitational potential energy (GPE) and kinetic energy (KE)?

• Mechanical Energy = GPE + KE

• Mechanical Energy = GPE × KE

• Mechanical Energy = GPE − KE

• Mechanical Energy = GPE ÷ KE

The diagram shows three positions of a pendulum during its swing. At which position does the pendulum have the greatest speed?

• X

• Y

• Z

• It has the same speed at positions X Y and Z

The diagram shows three positions of a pendulum during its swing. At which position does the pendulum have the most kinetic energy?

• X

• Y

• Z

• It has the same amount of kinetic energy at positions X Y and Z

The diagram shows three positions of a pendulum during its swing. At which position does the pendulum have the most gravitational potential energy (GPE)?

• Z only

• Y only

• Z and X

• It has the same amount of GPE energy at positions X Y and Z

The diagram shows three positions of a pendulum during its swing. At which position does the pendulum have the most mechanical energy (ME)?

• Z

• X

• Y

• It has the same amount of mechanical energy at positions X Y and Z

When the pendulum swings from position X (highest point) to position Y (lowest point), what happens to its energy levels?

• Gravitational potential energy decreases while kinetic energy increases

• Gravitational potential energy increases while kinetic energy decreases

• Both gravitational potential energy and kinetic energy increase

• Both gravitational potential energy and kinetic energy decrease

When the pendulum swings from position Y to position Z, what happens to its energy levels?

• Gravitational potential energy decreases while kinetic energy increases

• Gravitational potential energy increases while kinetic energy decreases

• Both gravitational potential energy and kinetic energy increase

• Both gravitational potential energy and kinetic energy decrease

What could you do to increase the GPE of the pendulum? Pick two.

• Make X and Z higher

• Make X and Z lower

• Increase the mass of the bob

• Make the pendulum string longer