PHET Gravity Quiz

Aria, Evelyn, and Rohan are discussing the relationship between gravity and mass. Which statement best describes their discussion?

• Gravity is inversely proportional to mass.

• Gravity has no relationship with mass.

• Gravity is directly proportional to mass.

• Gravity is equal to mass.

Scarlett is learning about gravity and weight in her physics class. How can she describe the relationship between gravity and weight?

• Gravity and weight are unrelated concepts.

• Gravity is the force that attracts objects towards each other, while weight is the measure of the force of air resistance on an object.

• Gravity is the force that repels objects away from each other, while weight is the measure of the force of gravity on an object.

• Gravity is the force that attracts objects towards each other, while weight is the measure of the force of gravity on an object.

Aria, Benjamin, and Sophia are discussing Newton's law of universal gravitation. Which statement correctly describes this law?

• Gravity only affects objects on the surface of the Earth.

• Gravity is caused by the rotation of the Earth.

• Every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

• Gravity is stronger between objects with smaller masses.

Charlotte, Luna, and Aria are discussing how gravity changes as they move away from Earth. What happens to gravity as they move further away from Earth?

• Gravity decreases

• Gravity remains constant

• Gravity becomes zero

• Gravity increases

Sophia is learning about famous scientists in her history class. She comes across the name Johannes Kepler. Who was Johannes Kepler?

• Johannes Kepler was a Spanish philosopher and theologian.

• Johannes Kepler was an Italian painter and sculptor.

• Johannes Kepler was a French physicist and chemist.

• Johannes Kepler was a German mathematician, astronomer, and astrologer.

Elijah and Abigail are discussing about the solar system. Elijah believes that the strength of gravity between two objects is determined by their mass. Abigail, on the other hand, thinks it's determined by their density, volume, or weight. Who is correct?

• Elijah (mass)

• Abigail (density)

• Abigail (volume)

• Abigail (weight)

Abigail is packing for a trip and she needs to check the weight of her luggage. Which unit of measurement should she use?

• liters (L)

• kilograms (kg) or pounds (lb)

• meters (m)

• grams (g)

Rohan, David, and Abigail are studying astronomy and they come across Kepler's three laws of planetary motion. Can you help them understand these laws?

• 3. The Law of Retrograde Motion: Planets, like Earth, sometimes appear to move backward in the sky.

• 1. The Law of Circles: All planets, like Earth, move in circular orbits, with the Sun at the center.

• 2. The Law of Inertia: Planets, like Earth, move in a straight line unless acted upon by an external force.

• 1. The Law of Ellipses: All planets, like Earth, move in elliptical orbits, with the Sun at one of the foci. 2. The Law of Equal Areas: A line that connects a planet to the Sun sweeps out equal areas in equal time intervals. 3. The Law of Harmonies: The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

Kai and Michael are discussing about a phenomenon they observed while playing basketball. They noticed that the ball always comes down after being thrown up. What is the force that causes this?

• Gravity is the force that attracts objects towards each other.

• Gravity is the force that repels objects away from each other.

• Gravity is the force that causes objects to float in space.

• Gravity is the force that causes objects to spin.

Mason and Noah are discussing about their science project. Mason says that the mass of an object is the amount of matter it contains, while its weight is the measure of the force of gravity on it. Noah, however, disagrees. Nora, who is listening to their conversation, is confused. Can you help Nora understand the difference between mass and weight?

• Mass is the amount of matter in an object, while weight is the measure of the force of gravity on an object.

• Mass and weight are the same thing.

• Mass is the measure of the force of gravity on an object, while weight is the amount of matter in an object.

• Mass and weight have no relationship with each other.