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Forces: Contact vs. Non-Contact

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Forces: Contact vs. Non-Contact

A rescue team is testing a small sled on a safe practice track. Explore which forces need objects to touch and which can act across a gap. Read each situation carefully, then classify and explain the forces.

Know the difference

A contact force happens when objects touch. Examples include a push, tension (the pulling force carried by a taut rope), and friction between surfaces. Other forces can act across a gap. Gravity pulls objects towards Earth, and magnets can attract or repel some materials without touching them.

1.The sled runner rubs against the track as the sled slides. Does the friction force require contact or act across a gap? Explain what must touch for it to happen.
2.The team pulls the sled with a rope. What kind of force travels through the tight rope, and does it require contact or act across a gap?
3.The sled is at rest on the track. Which force pulls it towards Earth without objects touching?
  • Friction
  • Gravity
  • The pull of the rope
  • Air resistance
4.A magnet attracts a steel clip across a small gap. Does this force require contact or act across a gap? Give one clue from the situation.
5.Match each event with its force type: contact or acting across a gap.
  • A hand pushes the sled
  • Earth pulls the sled down
  • The sled runners rub on the track
  • A magnet attracts a clip across a gap
  • Contact
  • Contact
  • Acts across a gap
  • Acts across a gap
6.True or false? Friction can slow a moving sled because its runners touch the track.
TrueFalse
7.Complete the sentence: A force that acts without objects touching is called a force that acts at a .
8.Imagine the sled is moving and the team stops pulling. Name one force that might slow it down and explain how that force acts.
9.A classmate says, “All forces need objects to touch.” Use gravity or magnetism to correct this idea with an example.

2 printable pages

  • Forces: Contact vs. Non-Contact, page 1 of 2: Know the difference

    Page 1

  • Forces: Contact vs. Non-Contact, page 2 of 2: 5. Match each event with its force type: contact or acting across a gap.

    Page 2

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