Identifying Types of Forces

Rina’s mother asked her to help move some items from the hall closet to the garage. One item she wanted to move was a large box of old school books. Rina tried to lift the box, but could not pick it up. What force was Rina NOT able to overcome? 

• frictional force
  frictional forcefrictional force
• gravitational force
• electrical force
• magnetic force 
  magnetic force
  

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Leanna decided to rearrange her bedroom by moving her dresser to the opposite wall. She tried pushing it, but found that the dresser would not move. What force was Leanne NOT able to overcome?

• electrical force
• magnetic force
• balanced force
• frictional force

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Magnets can be a useful tool. Look closely at the picture below which shows a magnet and various metal objects.
What will happen as the magnet moves closer to the metal objects? 

• The magnet will attract the objects.
• The magnet will become heavier.
• The magnet will push the objects away
• Nothing will happen to the objects

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Look at the illustration below of a block sitting on a table-top. The magnified view illustrates a force that exists between the two objects.
Which type of force is demonstrated in the magnified view? 

• magnetic force
• electrical force
• gravitational force
• frictional force

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Some forces can act over a distance, and others can only act by contact.  Which type of force can act only when two objects touch each other?

• gravitational 
• frictional
• electrical 

The illustration below shows what happened when a balloon touched a girl’s hair.
Which type of force caused the girl’s hair to cling to the balloon? 

• magnetic force
• frictional force
• electrical force
• gravitational force

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After walking across a carpeted floor in socks, Jim brings his finger near a metal doorknob and receives a shock. 
What does this demonstrate? 

• Frictional forces require direct contact.
• Electrical forces require direct contact
• Electrical forces can act at a distance.
• Frictional forces can act a distance.

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Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 

• That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
• That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
• That Jupiter’s and Earth’s gravitational forces are equal.
• Mass has no effect on the gravitational force between two objects

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Sodium chloride is a chemical that most people know as table salt. Microscopically, it is made of sodium ions that have a positive charge and chlorine ions that have a negative charge arranged like a checkers board. What is the best reason for why sodium ions and chlorine ions form table salt? 

• They are attracted to each other by the gravitational force
• They fit together like puzzle pieces.
• They are compressed by an unbalanced force.
• They are held together by the electrical force.

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Which of the following forces creates the electrical charges that form on a balloon when a person rubs it against a wool cloth? 

• electrical force
• magnetic force
• frictional force
• gravitational force