Question 1

According to Galileo's experiments with inclined planes, what would happen to a ball rolling on a perfectly horizontal, frictionless surface after being set in motion?

Accepted Answer

It would continue moving at a constant speed indefinitely.

Question 2

A 1 kg object on Earth's surface weighs 10 N. If the same object is taken to the Moon, where gravity is about 1/6th that of Earth, what is its mass and weight on the Moon?

Accepted Answer

Mass: 1 kg, Weight: about 1.67 N

Question 3

Which of the following best describes the concept of inertia?

Accepted Answer

The tendency of an object to resist changes in its state of motion.

Question 4

A cart is pushed to the right with a force of 15 N and pulled to the left with a force of 20 N. What is the net force acting on the cart?

Accepted Answer

$$5\ \mathrm{N} to $$the left

Question 5

Which equation correctly expresses the relationship between mass, acceleration, and net force according to Newton's Second Law?

Accepted Answer

$$F = m a$$

Question 6

A 10 kg object is in free fall near Earth's surface (neglecting air resistance). What is its acceleration?

Accepted Answer

$$10\ \mathrm{m/s^2$}$$

Question 7

A skydiver jumps from a plane and eventually reaches terminal velocity. At terminal velocity, which of the following is true?

Accepted Answer

The force of air resistance equals the weight of the skydiver.

Question 8

Which of the following statements about Newton's Third Law is correct?

Accepted Answer

For every action, there is an equal and opposite reaction.

Question 9

A 2 kg object is moving at $$3\ \mathrm{m/s}. $$What is its momentum?

Accepted Answer

$$6\ \mathrm{kg\cdot m/s}$$

Question 10

A car traveling at $$20\ \mathrm{m/s}$$ comes to a stop in $$5\ \mathrm{s}. $$What is its average acceleration?

Accepted Answer

$$-4\ \mathrm{m/s^2$}$$

Question 11

A 5 kg object is lifted to a height of 10 m. What is its gravitational potential energy relative to the ground? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$500\ \mathrm{J}$$

Question 12

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Question 13

A machine is 40% efficient. If you input 1000 J of energy, how much useful work does the machine output?

Accepted Answer

400 J

Question 14

According to Newton's Law of Universal Gravitation, what happens to the gravitational force between two objects if the distance between them is doubled?

Accepted Answer

It becomes one-fourth as strong.

Question 15

Which of the following is a correct statement about the center of gravity of an object?

Accepted Answer

It is the point where the average weight of the object acts.

Question 16

A wave has a frequency of $$10\ \mathrm{Hz}$$ and a wavelength of $$2\ \mathrm{m}. $$What is its speed?

Accepted Answer

$$20\ \mathrm{m/s}$$

Question 17

Which of the following best explains why sound travels faster in steel than in air?

Accepted Answer

Particles in steel are closer together, allowing vibrations to transfer more quickly.

Question 18

Which of the following is true about the photoelectric effect?

Accepted Answer

It demonstrates that light can behave as a particle.

Question 19

Which of the following is a chemical change?

Accepted Answer

Iron rusting in moist air

Question 20

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Describing Motion, Forces, and Newton’s Laws: Foundations of Physics

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