LGMSComp1AH_Q2

How many variables should be allowed to change in a well-designed, controlled

experiment?

• None

• 1

• 2 or more

• depends on the experiment

Which phrase best describes a hypothesis?

• performing a controlled experiment

• testing a factor, or variable, in an experiment

• reviewing information related to the problem

• suggesting a solution to a problem after studying it carefully

You are testing how well different dish soaps clean grease. What is the

independent (test) variable in you experiment?

• dishes

• water

• types of dish soap

• types of grease

Susan noticed that hummingbirds in her yard visited all the flowers, but

especially seemed to like the red trumpet-shaped ones. She read that they use

the nectar in the flowers for food. She hypothesized that since the parents were

eating nectar, they must feed their babies only nectar as well. To her surprise,

she saw hummingbirds bringing small spiders and insects to feed the young

hummingbirds. How does this new evidence affect her hypothesis?

• She should ask other people what they think and agree with the majority

• She should change her hypothesis that they only feed their babies nectar.

• She should believe what she read in the book and disregard what she

  witnessed.

• She should stick to her hypothesis that the babies eat nectar since she

  thought that first.

The model of the atom has changed over the past 200 years. Which of the

following best explains why scientific models change over time.

• Science must always change as times change.

• Scientists had to create better explanations to keep publishing.

• New evidence has been introduced through scientific discoveries.

• Technology, such as the internet, makes it easier to change scientific ideas.

Which of the following equations defines the law of conservation of energy?

• total energy = kinetic energy - potential energy

• total energy = potential energy - kinetic energy

• total energy = kinetic energy + potential energy

• total energy = kinetic energy x potential energy

Tags

NGSS.MS-PS3-5

What does the law of conservation of energy state?

• That energy cannot be created or destroyed

• That one form of energy cannot be transformed into two other forms at the

  same time

• That energy can be created or destroyed only during energy

  transformations

• That energy cannot be transformed from one form to another

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Cheryl picked up a rubber band. What should she do to it to give it the most

potential energy?

• put it out in the Sun

• let it blow in the wind

• hold it stretched out

• wad it into a tight ball

Tags

NGSS.MS-PS3-2

Which of the following is the best example of kinetic energy being transformed

into potential energy?

• an avalanche sliding down a mountainside

• wind pushing a sailboat through the water

• a motorboat pulling a water skier across a lake

• water flowing into a reservoir behind a dam

Tags

NGSS.MS-PS3-4

Forces that act at a distance include electrical force and gravitational force. What other type of force acts at a distance?

• friction

• conduction

• contact force

• magnetic force

Tags

NGSS.MS-PS2-3