4.12 Science Review

The toy car and ramp seen above might be used to answer which testable question?

• A. What material is the ramp made of?

• B. Which toy car looks the best?

• C What effect does gravity have on a toy car?

• D. What metal makes the best toy cars?

2. By changing the surface over which the car rolls from sandpaper to wax paper, you might be able to test the effect of what force?

• A. Magnetism

• B. Wind

• C. Wind

• D. Friction

6. Some students were investigating if the height that a ball was dropped would affect its bounce. The ball was dropped at 60 cm and at 80 cm. What statement is true of the results for each of the heights that the balls were dropped?

• F. There was no difference in the results.

• G. The ball dropped from 60 cm bounced 20 cm higher than

  the ball dropped from 80 cm.

• H. The ball dropped from 80 cm bounced higher than the ball dropped from 60 cm.

• J. The ball dropped from 60 cm bounced higher than the ball dropped from 80 cm.

A measure of the amount of matter in an object

• mass
• weight
• gravity
• pounds

As mass increases, what happens to gravitational force?

• increases
• decreases
• stays the same
• i don't know

A front is

• where warm air is cooling at earth's surface

• a boundary where hot and cold air are separating

• a boundary where two different air masses meet

• where cold air is rising and forming rain clouds

A cold front usually brings what kind of weather?

• snow  
• sunny and fair
• heavy rain and/or thunderstorms 
•  cool and dry 

What is the purpose of a barometer?

• Tells you that it is going to rain.

• Measures the amount of wind.

• Measusres the amount of clouds in the sky.

• It measure the amount of pressure in the air.