Question 1

According to Newton's law of universal gravitation, what happens to the gravitational force between two planets if both of their masses are doubled, but the distance between them remains the same?

Accepted Answer

The force quadruples.

Question 2

Which of the following best describes the gravitational force between two objects according to Newton's law?

Accepted Answer

It is attractive and very long-ranged.

Question 3

A spacecraft traveling from Earth to the Moon is pulled equally by Earth and the Moon when it is:

Accepted Answer

Halfway from Earth to the Moon.

Question 4

If you jump upward from a diving board and dive into a pool, neglecting air resistance, your velocity is:

Accepted Answer

Changing, but your acceleration is constant.

Question 5

Which equation correctly expresses Newton's law of universal gravitation?

Accepted Answer

$$F = G \frac{m_1$ m_2$}{d^2$}$$

Question 6

On the Moon, the acceleration due to gravity is $$1.62\,\mathrm{m/s^2$}. If $$your mass is $$70\,\mathrm{kg}$$, what is your weight on the Moon?

Accepted Answer

$$113.4\,\mathrm{N}$$

Question 7

Which of the following statements about projectile motion is correct?

Accepted Answer

The horizontal and vertical components of motion are independent of each other.

Question 8

A heavy red ball is released from rest 2.0 m above a horizontal surface. At the same instant, a light yellow ball is fired horizontally from the same height at $$3.0\,\mathrm{m/s}. $$Which ball hits the ground first?

Accepted Answer

They hit at the same time.

Question 9

The maximum range of a projectile launched from the ground occurs at which angle?

Accepted Answer

$$45^\circ$$

Question 10

Kepler's Third Law states that the square of the orbital period $$T of a $$planet is proportional to the cube of the semimajor axis $$a of $$its orbit. Which equation represents this law?

Accepted Answer

$$T^2$$ \propto $$a^3$$

Question 11

Which of the following best explains why ocean tides occur on Earth?

Accepted Answer

The gravitational pull of the Moon stretches Earth's oceans, creating bulges.

Question 12

During a spring tide, the effects of the Moon and Sun:

Accepted Answer

Add up, causing the most pronounced tides.

Question 13

Which of the following is true about satellites in circular orbit around Earth?

Accepted Answer

Their speed and kinetic energy remain constant.

Question 14

A satellite in an elliptical orbit around Earth has its kinetic energy ($$KE) $$and potential energy ($$PE) $$vary throughout the orbit. At which point is $$KE$$ greatest?

Accepted Answer

At perigee (closest to Earth)

Question 15

According to Einstein's General Theory of Relativity, gravity is best described as:

Accepted Answer

A distortion in space-time caused by massive objects.

Question 16

If the distance between two objects is tripled, what happens to the gravitational force between them according to Newton's law?

Accepted Answer

It becomes one-ninth as strong.

Question 17

Which of the following is necessary for a projectile to become an Earth satellite?

Accepted Answer

Its curved path must match the curvature of Earth's surface.

Question 18

A ball is thrown horizontally from a cliff. Which statement is true about its motion?

Accepted Answer

It accelerates downward due to gravity while moving horizontally at constant speed.

Question 19

Which of the following is a correct statement about the forces between two masses $$m_1$$ and $$m_2$$?

Accepted Answer

The force of $$m_1 on$$ $$m_2 is $$the same as the force of $$m_2 on$$ $$m_1.$$

Question 20

A satellite in orbit around Earth has a constant speed but its direction changes continuously. What type of acceleration does it experience?

Accepted Answer

Centripetal acceleration

module 5 lecture 10 :Gravitation, Projectile Motion, and Satellite Orbits

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