WS6.1b Conservation of Energy

Which of the following describes the principle of conservation of energy?

•  energy can be created or destroyed

•  energy cannot be created or destroyed

• energy cannot be transferred from one store to another.

• energy can be transferred from one store to another.

The total energy of an isolated system is ___.

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles.

Zoey begins her bungee jump off a platform. Before she starts falling, which energy store, E1, is associated with her being at level A?

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles.

Zoey begins her bungee jump off a platform. Before she starts falling, which energy store, E1, is associated with her being at level A?

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles.

Zoey falls to level B.

The gravitational potential store from A is transferred to ______ store at B. So at B, Zoey has _____.

• elastic potential,

  elastic potential and kinetic

• elastic potential,

  kinetic

• kinetic,

  gravitational potential

• kinetic,

  gravitational potential and kinetic

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles.

Zoey then falls to level C. The rope is extended to its full length but has not stretched.

Some of B's gravitational potential store is converted to C's _____. As energy is conserved, the total energy at B is ___ C.

• kinetic store (falls slower), different from

• kinetic store (falls slower), same as

• kinetic store (falls faster), different from

• kinetic store (falls faster), same as

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles.

Zoey then falls to level C. The rope is extended to its full length but has not stretched.

Some of B's gravitational potential store is converted to C's _____. As energy is conserved, the total energy at B is ___ C.

• kinetic store (falls slower), different from

• kinetic store (falls slower), same as

• kinetic store (falls faster), different from

• kinetic store (falls faster), same as

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles. Zoey ends up at level D, which is not shown in Figure 6.1. At this point, the bungee cord is fully stretched and Zoey comes to a stop.

Since Zoey stops, the kinetic store is ___ .

From C to D, height decrease so gravitational potential store ___.

• not 0,

  decreases

• not 0,

  increases

• 0,

  decreases

• 0,

  increases

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles. Zoey ends up at level D, which is not shown in Figure 6.1. At this point, the bungee cord is fully stretched and Zoey comes to a stop.

Since Zoey stops, the kinetic store is 0 J .

From C to D, height decrease so gravitational potential store decreases

The ____ of Zoey is transferred to the ____ of the stretched bungee cord.

• elastic potential stores,

  kinetic stores and gravitational potential stores

• gravitational potential stores and elastic potential stores,

  kinetic stores

• kinetic stores and gravitational potential stores,

  elastic potential stores

• kinetic stores,

  gravitational potential stores and elastic potential stores

Zoey does the bungee jump where a thick rubber rope (bungee cord) is tied to her ankles. Zoey ends up at level D, which is not shown in Figure 6.1. At this point, the bungee cord is fully stretched and Zoey comes to a stop.

At D, the total amount of energy in is equal to A.

What energies does D consists of?

gravitational potential store of Zoey and elastic potential store of the bungee cord.

• gravitational potential store of Zoey

• elastic potential store of the bungee cord

• kinetic store of Zoey

• internal store of Zoey