ASTR 1P01/02: Introduction to Astronomy I/II
Practice Questions

Please solve the following questions. This is not an assignment, it will not be graded, and you do not need to submit your solutions to anyone. The questions are simply intended to help you practice for the exam.

These questions will not appear in the exam itself. Students who don't genuinely attempt to solve the questions on their own, and only memorize the solutions, will have a very hard time in the actual exam!

These questions are not multiple-choice, to encourage you to think of the answers on your own, but the questions in the actual exam will be multiple-choice.

If you need any clarifications for these questions, you can ask for them on the course Teams channel.

Question 1

If I throw a ball in empty space with no gravity, it will keep moving forever at a constant speed in the same direction. However, this won't happen if I throw a ball on Earth. Explain why using Newton's first law.

Question 2

According to Newton's second law, when does an object's momentum change?

Question 3

An proton is pulling an electron towards it by exerting an electric force on it. Does the electron exert a force on the proton?

Question 4

Explain how a rocket works using Newton's laws.

Question 5

I have a block of concrete and an inflated balloon. Both have the same volume. Which one will have a larger mass, and why?

Question 6

I have a block of lead and a bucket of water. Both have the same mass. Which one will have a larger volume, and why?

Question 7

If the Earth had an orbital radius twice as large, how will its angular momentum change?

Question 8

If the mass of the Earth doubled, how would the force of gravity between the Earth and the Moon change?

Question 9

If the distance between the Earth and the Moon tripled, how would the force of gravity between the Earth and the Moon change?

Question 10

Does the Andromeda galaxy, 2.5 million light years away, exert any gravity on you personally?

Question 11

"The astronauts on the International Space Station do not experience any gravity." True or false?

Question 12

"A planet moves fastest when it is at the perihelion (the point closest to the Sun) compared to any other point, due to Kepler's second law". True or false?

Question 13

Which planet has the most eccentric orbit? And what does this mean for the shape of its orbit?

Question 14

Where is the Kuiper belt located?

Question 15

If Superman throws a ball with enough force, can he send that ball into an orbit around Earth?

Question 16

"Kepler's laws give a 100% precise description of the orbits of planets in the solar system." True or false?

Question 17

What has more momentum: a 1 kg ball moving at 5 m/s or a 5 kg ball moving at 1 m/s?

Question 18

A ball was moving at a velocity of 3 m/s. It then accelerated with an acceleration of 6 m/s2 for 2 seconds. What was its final velocity?

Question 19

During a plane flight, when is the plane's frame an inertial frame and when is it not an inertial frame?

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