Which garden factor affecting plant growth is biotic?

Identify an abiotic factor in a Philippine rainforest.

How should living bacteria in garden soil be classified?

Rabbits and goats feed on the same limited grass in a pasture. Which ecological relationship does this show?

Which resource supplies the energy algae use to make food?

Which abiotic condition can influence where fish live in a river?

Liza tests how soil moisture affects mongo growth. What should she change between otherwise identical groups?

Which comparison fairly tests how caterpillars affect pechay growth?

What is the name of the support about which a seesaw turns?

When someone uses a bar to lift a crate, what is the force supplied by that person called?

What does a lever's effort arm measure?

Which lever class is shown in the diagram?

A wheelbarrow lifting its loaded tray acts as which lever class?

While sweeping, one hand holds a broom's top steady and the other pushes midway along its handle. Which lever class is used?

Which simple machines describe scissors' pivoting handles and sharpened blade edges, respectively?

A bar lifts a heavy stone. Which support position reduces the push needed, with the bar's ends unchanged?

Which situation involves mechanical work done on a box?

How is actual mechanical advantage calculated?

A machine delivers 300 N when supplied with 100 N. What is its actual mechanical advantage?

Use the labeled arm lengths. What is this lever's ideal mechanical advantage?

What useful change does the arrangement shown provide when raising a load?

Ignoring friction and the wheel's weight, what effort is needed to lift the load shown?

Count the rope segments supporting the moving block. What is this system's ideal mechanical advantage?

Effort acts at the outer rim and the load acts at the central shaft. What is the ideal mechanical advantage shown?

Which simple machine helps a round doorknob turn its central shaft?

With effort at the outer rim and its radius unchanged, what happens to ideal mechanical advantage if the central shaft becomes thicker?

A lever's effort arm is shorter than its load arm. What can this arrangement provide for the same effort movement?

Which plan fairly tests how push position affects the force needed to lift a crate with a bar?

Which description fits a loading ramp?

Use the dimensions in the diagram. What is the ideal mechanical advantage of this loading slope?

Which instrument measures the pulling force during a loading-slope investigation?

Compared with lifting a crate straight upward, how does a frictionless loading slope help?

A plank's sloping length stays unchanged, but its upper end is raised. How does the ideal force needed to pull the same crate upward change?

Which distance is used as the height when calculating a loading slope's ideal mechanical advantage?

When a knife is pushed downward into food, how do its sloping sides act?

Using length divided by thickness, what is the ideal mechanical advantage of the tool shown?

Which property helps a doorstop remain in place while holding a door open?

What is the distance between neighboring threads on a screw called?

Effort is applied around this screw head. What is the ideal mechanical advantage using the labeled effort-path circumference and thread pitch?

Two screws have equal diameters. Which design provides greater ideal force multiplication?