8.3 Noncontact Force Test

Between which pair of objects is gravitational pull the strongest?

(a)  

• A

• B
• C

• They are all equal

How could you increase the force of gravity between the spheres of Pair C?

(a)  

• Move them further away

• Move them closer together
• Cut both of their masses in half

• Change their shape to boxes

A cosmonaut is show here floating weightlessly in a space shuttle. Is earth's gravity acting on the cosmonaut?

(a)  

• Yes
• No

• It depends on how far from Earth he is

• It depends on how big of a space station he's in

Two magnets are aligned properly and it causes them to stick together tightly. Even though the magnetic force between the two magnets is much stronger, there is also gravitational force pulling them together.

(a)  

• True
• False

Which of the following graphs best represents the gravitational force between two objects?

ONLY CHOOSE ONE GRAPH!

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• 
• 
• 

Two ruby necked hummingbirds perch down beside each other for a meal. If by the end of the meal, each bird eats its own mass in food (the mass of each bird doubles), how much does the gravitational force between them change?

Assume the distance between the birds does not change.

(a)  

• It doubles

• It triples

• It quadruples
• It does not change

Why does the earth stay in orbit around the sun instead of drifting away from it into space?

(a)  

• Electric force between the Sun and Earth

• Magnetic force between the Sun and Earth

• Gravitational force between the Sun and Earth

What two factors affect the force of gravity exerted between two objects?

• The mass of the objects

• The orbital paths of the objects

• The color of the objects

• The distance between the objects

As the distance between objects increases, the force of gravity between them

(a)  

• increases

• decreases
• stays the same

As the distance between charged objects increases, the electric force between them

(a)  

• increases

• decreases
• stays the same