Unit 1 Review (Physical Science

Front

Example of a scientist using a model:

Back

Moving a slinky's end up and down simulates a wave.

Answer explanation

The correct choice illustrates a scientist using a model by moving a slinky to represent wave motion, effectively simulating a physical phenomenon. This demonstrates how models can help visualize and understand complex concepts.

Tags

NGSS.MS-PS4-1

Front

Example of a scientist using a model:

Back

Marbles in a hollow sphere represent protons in a nucleus.

Answer explanation

The correct choice illustrates how a scientist uses a model by representing protons in a nucleus with marbles in a hollow sphere, demonstrating a scientific concept through a physical analogy.

Tags

NGSS.MS-PS1-1

Front

Law of gravity as a universal law:

Back

Gravity exists between any two masses.

Answer explanation

The law of gravity is universal because it applies to all masses, regardless of their location. This means gravity exists between any two masses, making it a fundamental force in the universe.

Tags

NGSS.MS-PS2-4

Front

Definition of a universal law:

Back

In effect at all times.

Answer explanation

A universal law is defined as a principle that is consistently applicable in all situations, making 'It is in effect at all times' the correct choice. The other options suggest limitations or variability, which contradict the concept of a universal law.

Front

Experiment on sugar solubility in water with 100ml and 5 min stirring. Independent variable?

Back

Temperature of the water

Answer explanation

The independent variable is the factor that is changed in an experiment. In this case, the temperature of the water is what the student is testing to see how it affects sugar solubility, making it the independent variable.

Front

Experiment on how temperature affects sugar solubility in 100ml water, stirred for 5 mins. Dependent variable?

Back

Amount of sugar that can dissolve in water.

Answer explanation

The dependent variable is what is measured in the experiment. Here, it is the amount of sugar that can dissolve in water, as it changes with varying temperatures, while the other options are constants or controls.

Tags

NGSS.MS-PS1-4

Front

SI unit for rope length

Back

meter

Answer explanation

The meter is the standard SI unit for measuring length. It is appropriate for measuring the length of a rope, as it provides a practical scale for everyday use, unlike kilometers, centimeters, or millimeters.

Front

SI unit for boulder mass?

Back

kilogram

Answer explanation

The kilogram is the correct SI unit for measuring mass, making it suitable for a boulder. Pounds and tons are not SI units, while grams are too small for such a large object.

Front

Experiment on how ball temperature affects bounce height. Same ball and drop height used.

Back

Temperature of the ball

Answer explanation

The independent variable is the factor that is changed in an experiment. In this case, the temperature of the ball is what is being tested to see how it affects the bounce height, making it the independent variable.

Front

Experiment: Effect of temperature on ball's bounce height. Same ball, same drop height. Dependent variable?

Back

Bounce height

Answer explanation

The dependent variable is the one being measured in the experiment. In this case, the bounce height of the ball is affected by the temperature, making it the dependent variable, while the other options are not measured outcomes.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5