Gravity

Poll

What causes planets to stay in their orbits?

• Gravity

• Inertia

• Gravity and Inertia

• Neither

Multiple Choice

Since we are measuring the gravitational FORCE of attraction, what is the unit for our final answer?

• Newton

• Joule

• Nm

• m/s

Multiple Choice

((6.67x10-11) (0.56) (0.56)) / 3^2

• 2.23x10^-12 N

• 2.23x10^12 N

• 2.32x10^-12 N

• 2.32x10^12 N

Multiple Choice

(7.83 N/kg) (80 kg) =?

• 626.4 N

• 624.6 N

Multiple Choice

Since we are trying to solve for the weight on earth, Do you remember the value of "g" on Earth?

• 6.67x10^11N

• 6.67x10^-11N

• 9.8 m/s

• 9.8 m/s^2

Multiple Choice

(9.8m/s^2) (80 kg) =?

• 784 N

• 792 N

Multiple Choice

If you may recall, GPE is a type of energy. It shares a unit with Work and Kinetic Energy. What is their unit?

• Newton

• Joule

• Watts

• rad

Multiple Choice

Test for understanding: What are the two factors causing planets to stay within their orbits?

• Gravity and Inertia

• Inertia and Velocity

• Mass and Velocity

• Power and Energy

Multiple Choice

How does gravity and inertia allow planets to stay within their orbits?

• Gravity pulls planet back while inertia pulls away to move straight.

• Gravity pulls away to move straight, inertia pulls inward.

• Inertia opposes gravity in all aspects

• Gravity cannot pull planet inward

Multiple Choice

Since Escape VELOCITY measures how fast you must move to counteract the gravitational pull, what is the unit for it?

• N

• m/s^2

• m/s

• Nm

Multiple Choice

√(2(6.67x10 -11)(5.974x10 24))/6371000 = ?

• 11184.25 m/s^2

• 11184.25 m/s

• 111825.48 m/s

• 111825.48 m/s^2

Multiple Choice

If you are a believer of the GEOCENTRIC model, from the words GEO and CENTRIC, which do you think the center of the universe is?

• Earth

• Sun

• Moon

• Everything between

Multiple Choice

If you are a believer of the HELIOCENTRIC model, from the words HELIO and CENTRIC, which do you think the center of the universe is?

• Earth

• Sun

• Moon

• Everything between

Multiple Choice

Test for comprehension: Who are the two scientists attributed for the Laws of planetary motion?

• Kepler and Brahe

• Kepler and Newton

• Newton and Brahe

• Ptolemy and Copernicus

Multiple Choice

___ is to close to the sun; as ___ is far from the sun

• Perihelion; Aphelion

• Aphelion, Perihelion

Multiple Choice

Let us consider MVEMJSUN as order of planets from the sun (left to right). Which has longer period, Mercury or Earth?

• Mercury

• Earth

Multiple Choice

Let us consider MVEMJSUN as order of planets from the sun (left to right). Which has longer period, Uranus or Earth?

• Uranus

• Earth

Multiple Choice

Let us consider MVEMJSUN as order of planets from the sun (left to right). Which has longer period, Saturn or Jupiter?

• Saturn

• Jupiter

Multiple Choice

Let us consider MVEMJSUN as order of planets from the sun (left to right). Which has shorter period, Neptune or Venus?

• Neptune

• Venus