Gravity and Orbits Video and Questions

What is the natural state of the Universe?

• Stars

• Planets

• Empty space

• Galaxies

What is mass?

• The amount of stuff in an object

• The force exerted by an object

• The density of an object

• The size of an object

What determines the force of gravity between two objects?

• The distance between the objects

• The color of the objects

• The size of the objects

• The speed of the objects

What shape do planets orbit the Sun in?

• Parabola

• Ellipse

• Hyperbola

• Circle

What happens if an object travels faster than the escape velocity?

• It stops moving

• It escapes from the object

• It enters a circular orbit

• It falls back to the object

What is the condition of an object in free fall with no weight?

• Weightlessness

• Zero gravity

• Inertia

• Microgravity

What is the escape velocity for the Earth?

• 20 kilometers per second

• 11 kilometers per second

• 5 kilometers per second

• 15 kilometers per second

What is the force that can warp space?

• Gravity

• Friction

• Magnetism

• Electricity

What is the force that causes an object to have weight?

• Centripetal force

• Momentum

• Inertia

• Gravity

What is the effect of gravity on photons?

• It accelerates them

• It repels them

• It slows them down

• It bends their direction of flight