Act 1-3 Review

When an object is energy efficient, it means that...

• Object uses up a lot of energy to do it's job

• Object uses less energy to do it's job than other similar objects

Two of the factors that affect Gravitational Potential Energy are:

• mass and volume

• volume and height

• mass and matter

• mass and height

Where along the roller coaster is KINETIC energy the greatest?

• Point 1

• Point 2

• Point 3

• Point 4

Where along the roller coaster is potential energy and kinetic energy APPROXIMATELY equal?

• Point 1

• Point 2

• Point 3

• Point 4

Other than KE and GPE, on a rollercoaster some energy may be transformed into

• thermal energy and chemical energy

• thermal energy and sound energy

• sound energy and chemical energy

• no energy can be transformed

Energy that is TRANSFORMED is

• energy is never transformed

• when it changes from one type to another

• when it moves from one place to another

• energy is always transformed

Energy that is TRANSFERRED is

• is never transferred

  
  

• when it changes from one type to another

• when it moves from one place to another

• is always transferred

A student releases a ball from a height of 100 cm above the ground. The ball bounces to a height of 80 cm. The diagram below shows the ball’s position at five different times from its starting point to its maximum height after the first bounce.

Which position has the greatest potential energy?

• Position 1

• Position 2

• Position 3

• Position 4

• Position 5

A student releases a ball from a height of 100 cm above the ground. The ball bounces to a height of 80 cm. The diagram below shows the ball’s position at five different times from its starting point to its maximum height after the first bounce.

Why does the ball have kinetic energy at positions 2 and 4?

• The balls are falling, so they must have kinetic energy.

• The balls are both in motion, so they have kinetic energy.

• The balls do not have any kinetic energy.

• The ball have more potential energy as they fall.

A student releases a ball from a height of 100 cm above the ground. The ball bounces to a height of 80 cm. The diagram below shows the ball’s position at five different times from its starting point to its maximum height after the first bounce.

As the ball falls from position 1 to position 3, at which height does the ball have approximately equal amounts of kinetic energy and potential energy?

• 100 cm

• 80 cm

• 50 cm

• 0 cm