1st Semester Physics Final Review I

Coulomb's and the gravitational law are similar. Which law indicates that the force could be attractive or repulsive and why?

• Coulomb's law describes a force that is repulsive or attractive because it is based on charges.

• The laws are similar because they both describe forces that can be repulsive and attractive.

• The law of gravitational forces describes the repulsion and attraction of matter.

• The laws are similar because neither law describes repulsion or attraction of charges.

Which statement best describes the effect of gravitational force between objects?

• The force of attraction between masses exists regardless of the distance of the objects.

• The force of attraction between masses becomes stronger the greater the distance.

• The force of attraction between masses depends on the gravity acting on it.

• The force of attraction between masses grows stronger when the masses are the same size.

A gravitational system has two objects with the same mass. Which change below would result in the smallest force between the objects?

• doubling the distance between the objects

• doubling one of the masses

• halving one of the masses

• halving the distance between the objects

Both fusion and fission change the structure of the nuclei. What is the main difference between the reactions?

• fusion joins lighter elements to form a heavier one

• fission joins lighter elements to form a heavier one

• energy is released only in fusion

• energy is released only in fission

Nuclear fusion is continually occurring on our sun. What is one product of that process?

• carbon dioxide
• helium
• nitrogen
• hydrogen

Weightlessness is due to _____.

• Lack of air resistance
• a balance of forces

• Presence of anti-gravity
• Invisibility of gravity

How many masses are needed to have gravity?

• 3
• 0
• 5
• 2

Weight is _____.

• the measure of the force exerted on an object due to temperature
• the measure of the force exerted on an object due to wind
• the measure of the force exerted on an object due to gravity
• the measure of the force exerted on an object due to magnetism

Like particles _____ and opposite particles _____.

• merge, divide
• attract, repel
• repel, attract

• combine, separate

Charged particles are responsible for much of the cellular _____ in the world.

• movement

• energy

• replication

• growth