Review for 7A

What is the force that keeps the moon in orbit around the earth?

• Gravity

• Resistance

• Centrifugal Force

• Drag

The Sun's gravity will be stronger on ​ (a)   than on​ Saturn because of its proximity.

• Earth
• Uranus
• Neptune

If two objects are distant from one another, their gravitational effects on each other will be​ (a)   .If two objects are closer together, their gravitational effects on each other will be​ (b)   .

• less
• greater
• the same
• zero

Sort the following by whether the question is scientifically testable or not:

Groups:

(a) Scientifically Testable

,

(b) Not Scientifically Testable

• How long can cockroaches survive without air?

• Which school has the best school lunches?

• What are the average number of calories in a student lunch?

• Are cockroaches the ugliest insect?

Reorder the following from the surface with the most friction to the surface with the least friction:

• rug

• sandpaper

• cement

• ice

• beach sand

The graph shows the number of milliseconds it took for a ball to roll across four different surfaces. Which of the surfaces had the MOST friction?

• A

• B

• C

• D

Sydney drops two identical umbrellas from the top of the school. Both land at the same time. What could she change to make them land at different times?

• Opening one umbrella would change its mass, making it land later.

• Opening one umbrella would change its weight, making it land later.

• Opening one umbrella would change its height, making it land later.

• Opening one umbrella would change its air resistance, making it land later.

Match the magnet configuration to what it will do.

Groups:

(a) Attract

,

(b) Repel

• 
• 
• 

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the independent variable?

• Type of fertilizer

• Size of sunflower

• Sunflower grown without fertilizer

• The amount of fertilizer given

Steve wanted to see if the type of fertilizer made sunflowers grow larger. What is the dependent variable?

• Type of fertilizer

• Size of sunflower

• Sunflower grown without fertilizer

• The amount of fertilizer given