What forces cause a planet to orbit?

• gravity and orbit
• gravity and inertia
• gravity and mass
• gravity and weight

What would happen to the planets in the solar system if the sun’s gravitational force were to suddenly disappear?

• They will stop moving and become static.
• They will stop spinning.
• They will fly away in straight lines.
• They will start moving toward the Sun

 
Which force in the Solar System is similar to the tension in the string?

• Friction
• Inertia
• Force
• Gravity

Because of inertia, a moving object will keep ________.

• at rest
• moving
• in one spot
• inertia 

To change the motion of an object, inertia must be overcome by a __________ acting on the object.

• temperature
• speed
• force
• velocity

Because of inertia, a resting object will remain at ________.

• rest
• a constant speed
• school
• inertia 

Which of the following is an example of inertia?

• Slamming on the breaks in your car and flying forward.
• An apple falling off of a tree. 
• Running at a cross country event. 

What does heliocentric mean?

• Earth centered

• Helium centered

• Sun centered

• Proof of the Big Bang

What theory of the Universe did Ptolemy believe in? 

• Geocentric theory
• Vergocentric theory
• Heliocentric theory
• Alphamanic theory

____ was an American astronomer with a large space telescope named after him.

• Hubble
• Ptolemy
• Newton
• Galileo