Students observed an apple falling from a tree to the ground. Which of these best identifies the type of energy an apple has because it is hanging from the tree?

• kinetic energy

• elastic potential energy

• gravitational potential energy

• nuclear potential energy

Which event is caused by these temperature differences?

• hgh tide

• lightning

• land breeze

• seasons

A ball rests on a shelf one meter above the ground. Which action wil increase the kinetic energy of the ball while decreasing its potential energy?

• rolling the ball along the shelf

• dropping the ball off the shelf

• letting the ball rest on a shelf 0.5 meter above the ground

• lifting the ball to a shelf 2 meters above the ground.

Which of these best describes the role of the shark in this feeding diagram?

• producer

• consumer

• decomposer

• prey

Which best describes the energy transformations that allow the car to move forward?

• chemical to electrical to mechanical

• electrical to chemical to thermal

• mechanical to chemical to sound

• therma to electrical to chemical

What energy source formed this convection current in the atmosphere?

• gravity from the moon

• heat from the sun

• rotation of Earth

• action of tides

Which statement correctly describes energy flow through this food chain?

• the frog receives energy from the caterpillar

• The snake receives energy from the owl

• The thistle receives energy from the caterpillar

• The caterpillar receives energy from the snake

A student drops a ball. As the ball falls, it loses 4.2 joules (J) of gravitational potential energy. The gravitational potential energy of the ball is then converted into a different form. About how much kinetic energy does the ball gain?

• 2.1 J

• 4.2 J

• 8.4 J

• 16.8 J

A student in a science class wants to demonstrate elastic potential energy. Which are the best objects to use for this demonstration?

• a rubber band and a weight

• a mass and an electronic balance

• a stack of books and bookcase

• a ramp and three different toy cars

Which of these best identifies a cold water current and explains its cause?

• North Equatorial Current, because it flows along the equator

• Equatorial Counter Current because it flows west to east

• East Australian Current, because it rotates in a counter-clockwise directionq

• Humboldt Current, because it moves water from south of the equator back toward the equator