Unit 3 Test: Four Fundamental forces

Which force is responsible for keeping a book resting on a table and holding Earth in its orbit around the Sun?

• Gravitational Force

• Weak Nuclear Force

• Strong Nuclear Force

• Electromagnetic Force

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What force is responsible for holding the nucleus of an atom together, thereby defining the characteristics of elements?

• Strong Nuclear Force

• Electromagnetic Force

• Weak Nuclear Force

• Gravitational Force

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Imagine you're comparing the strength of forces at a molecular level to understand how atoms and particles interact. Rank the four fundamental forces of nature in order from weakest to strongest:  

• Electromagnetism, Gravity, Strong Nuclear, Weak Nuclear

• Weak Nuclear, Gravity, Electromagnetism, Strong Nuclear

• Gravity, Weak Nuclear,  Electromagnetism, Strong Nuclear

• Weak Nuclear, Electromagnetism, Gravity, Strong Nuclear

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Gravity is due to:

• the pull between Earth and the moon.
• the pull between the Sun and Earth. 
• the pull between any objects with mass. 
• the pull between atomic nuclei. 

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Which of the following is an example of the electromagnetic force?

• The attraction between a magnet and a piece of iron

• The force holding the nucleus of an atom together

• The force causing radioactive decay

• The force of gravity between the Earth and the Moon

Answer explanation

The attraction between a magnet and a piece of iron is an example of the electromagnetic force, which involves the interaction between charged particles. The other options relate to different forces: nuclear, weak, and gravitational.

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DOK Level 1: Recall

Which characteristic is true of the weak nuclear force?

• It is responsible for holding the nucleus together.

• It is responsible for electromagnetic interactions.

• It is responsible for radioactive decay.

• It is responsible for gravitational attraction.

Answer explanation

The weak nuclear force is responsible for processes like beta decay, which is a type of radioactive decay. It does not hold the nucleus together (that is the strong force) or govern electromagnetic or gravitational interactions.

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DOK Level 1: Recall

Gravity and electromagnetic have a range that is ____________. 

• Short
• Long 
• Infinite
• Variable

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________ can be either a force of attraction or repulsion while ____________ is only a force of attraction.

• Gravity; Electromagnetism 
•  Electromagnetism; Gravity
• Gravity; Strong nuclear force 
• Magnetism; Electricity 

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____________ and ____________ are short range forces. 

• Gravity, Electromagnetism
• Strong Nuclear, Weak Nuclear
•  Electromagnetism, Strong Nuclear
• Gravity, Weak Nuclear

An apple falling from a tree is an example of the force of ____________.

• Gravity

• Electromagnetism

• Strong Nuclear

• Weak Nuclear

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