The Retake

Which process is most suitable for the direct measurement of weight?
 

• a.  Using an electronic scale and expressing the results in newtons per meter.
•  b. Using a spring scale and expressing the results in ounces. 
• c. Using a barometer and expressing the results in pounds per square inch.
• d. Using a balance and expressing the results in kilograms. 

According to Newton’s law of universal gravitation, in which of the following situations does the gravitational attraction between two objects always increase? 

•  a. The masses increase, and the distance of objects increases. 
• b. The masses increase, and the distance of objects decreases. 
• c. The masses decrease, and the distance of objects increases.
• d. The masses decrease, and the distance of objects decreases

What determines the gravitational pull on an object on the surface of the Moon?   

• a. The surface features of the Moon.
• b. The mass of the Moon.
• c. The rotational speed of the Moon.
• d. The distance of the Moon from Earth.

A red ball weighs more than a blue ball. This requires that:   

• a. The red ball is larger than the blue ball. 
• b. In direct sunlight the red ball is larger than the blue ball.
• c. Earth’s gravitational pull on the red ball is greater than on the blue ball.
• d. Earth’s gravitational pull on the blue ball is greater than on the red ball.

The diagram illustrates two blocks composed of different materials. If Block A is located on the Moon and Block B is located on Earth, what property do these two blocks have in common? 

• a. They have the same mass.
• b. They have the same weight. 
• c. They have the same volume. 
• d. They have the same surface area. 

Gravity is responsible for the:   

• a. Orbits of the planets around the Sun. 
• b. Rotation of a planet on its axis.
• c. Tilt of Earth’s axis.
• d. Phases of the Moon.

A student researches Jupiter and Saturn and records the following information: • Jupiter is about half the distance to the Sun than Saturn is. • Jupiter is about three times more massive than Saturn. Based on this information, which of the following can be concluded about the gravitational forces between these planets and the Sun? 

• a. There are no gravitational forces between Jupiter and the Sun or between Saturn and the Sun.
• b. There are equal gravitational forces between Saturn and the Sun and between Jupiter and the Sun. 
•  c. There is a greater gravitational force between Jupiter and the Sun than between Saturn and the Sun. 

Which of the following best describes why the Moon orbits Earth? 

• a. The distance the Moon and Earth are from the Sun.
•  b. The energy reflected from the surface of Earth.
• c. The winds generated on Earth by the energy of the Sun.
•  d. The gravitational attraction between the Moon and Earth. 

Martha wants to know if there is a difference between mass and weight. Which statement is correct to tell Martha?

• a. Mass and weight are the same. 
• b. Mass and weight change with motion. 
• c. Mass measures the amount of matter in an object, and weight measures the force of gravity. 
• d. Weight measures the amount of matter in an object, and mass measures the force of gravity.

Scientists observe a distant star and the four planets that orbit the star. They determine that the four planets have different diameters, but approximately the same mass. This star system is represented by the diagram.Which planet has the weakest gravitational attraction to the star?

• a. Planet 1 
• b. Planet 2 
• c. Planet 3
•  d. Planet 4