Work Review Stations
STATION 1
1. Work is measured in Joules
2. Work depends on two conditions: A. Distance
B. Force
3. Tools needed to calculate work are: A. Meter Stick
B. Spring Scale
STATION 2
Work = Force x Distance
= 980N x 2.04m
= 1,999.2J
STATION 3
1. Requires greatest distance = B – longest ramp
2. Require the least distance = C – shortest ramp
STATION 4
1. Requires greatest force = C – shortest ramp
2. Requires least force = B – longest ramp
STATION 5
How does work compare in each situation? They are all the same amount of work (going to the same height)
STATION 6
Greatest to least amount of work: A, B, C, D
A = 500N x 6m = 3,000J
B = 95N x 8m = 760J
C = 150N x 3.5m = 525J
D = 100N x 0m = 0J
STATION 7
Johnny did more work (35N x 1.5 = 5.5J, Bob is only holding)
STATION 8
Johnny did more work (Steve is unable to lift)
STATION 9
A. Work is done when you lift it
B. Work is not done (force and movement are in different directions
C. Work is done when you push it
D. Work is not done (“sitting”)
STATION 10
1. Timmy is only holding, 0J of work
2. 45N x 1.5m = 67.5J each time x 3 times = 202.5J
Food Chains, Webs, and Energy Pyramids Test Review
1. What are examples of abiotic and biotic factors? Make a t- chart below.
Abiotic
Biotic
Sun
Plants
Air
Animals
Dirt
Bacteria
Water
Decomposers
2. What happens to the amount of energy in an energy pyramid as it moves up through the different levels?
Available energy decreases by 90% with each trophic level
3. Explain a predator/prey relationship.
Predators hunt and eat prey
4. Use the following to make an accurate food chain: bacteria, snake, mouse, grass, cricket, and sun
Grass -> Cricket -> Mouse -> Snake (grass doesn’t “eat” the sun, bacteria breaks each down)
5. What would happen to the food chain above if the cricket population vanished?
- The grass would overpopulate
- Mouse and snake would die due to lack of food source
6. Label the level of consumers in the food chain below: producer, tertiary consumer, secondary consumer, and
primary consumer. Draw the sun where it should go as well.
Grass = Producer
Food Chain- a sequence of who eats who in a biological
Grasshopper = Primary consumer
community, starting with plants as original producer and the
Toad = Secondary consumer
consumers that follow.
Snake = Tertiary consumer
Food Web- a series of interrelated food chains within a
biological community.
Energy Pyramid- a graphic representing the loss of energy as
you move up a food chain.
7.
8. A carnivore eats other animals. An herbivore eats plant material. Give a real life example of a carnivore eating
an herbivore.
Fox eating rabbit, Lion eating giraffe
9. Students take turns caring for the organisms living in their classroom. They have an aquarium of fish, a
hamster, and a fern. Classify each of these organisms according to their energy roles (i.e. producer, consumer,
decomposer, etc.).
Fish = consumer, hamster = consumer, fern = producer
10. Put the following biotic factors in order from smallest to largest: Community, Organism. Ecosystem,
Population
Organism, population, community, ecosystem
11. What is produced as a result of decomposers breaking down the
biodegradable garbage in a compost pile?
Compost (nutrients such as carbon and nitrogen)
12. Which organism in the ecosystem to the right is a producer?
Rice grains
13. What are the energy roles of the cat in the ecosystem to the right?
Primary consumer, Secondary consumer, and Tertiary consumer
14. What will happen to the tarantulas in the ecosystem to the right if the ants died out?
Tarantulas would die out (no more food source)
15. What will happen to the rice plants in the ecosystem on the previous question if the tarantulas died out?
They would decrease in population (ants have 1 less predator and will thus increase in population)
16. What is the diagram to the right called?
Food chain
17. Which organism is the source of all of the energy for the
ecosystem shown to the right?
Sun gives energy to phytoplankton
18. Which organism in the diagram to the right and above is considered a secondary consumer?
Fish
19. Where is most of the energy in an energy pyramid located?
Producers
20. What type of organisms make up the upper levels of an energy pyramid?
Carnivores
21. What happens to the amount of available energy as you move from the bottom to the top of an energy
pyramid?
Decreases by 90% with each step
22. Which ecosystem shown above has the greatest biodiversity?
Ecosystem 1
23. What would happen to the number of foxes if the chipmunks were removed from Ecosystem #1?
Decrease (less food options)
24. What would happen to the number of foxes if the chipmunks were removed from Ecosystem #2?
They would completely die out (no food)
25. How is eating your lunch a form of energy transfer?
You get chemical energy from your food and your body converts it to mechanical energy
26. How can you tell work is being done?
A force is applied over a distance
27. Give an example of when you apply force, but don’t do work.
You push an object and it does not more; you apply a force to an object and it moves in a different direction
28. The word “turgor” comes from the Latin word that means “swollen”. How can this help you remember the
meaning of turgor pressure?
As the vacuole in a plant cell become swollen from water, the turgor pressure increases
29. In the space below, draw a diagram that shows the force inside a plant cell that allows plant stems and leaves to
stay rigid and upright. Label your diagram.
30. Animal cells cannot experience turgidity. Why not?
Animal cells do not have a cell wall to place pressure against
31. How can you demonstrate the effect of gravity on plants? What is it called?
If you turn a plant sideways or upside down, the roots will turn to grow downwards to match the pull of
gravity. This is call gravitrophism or geotrophism