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lydia_hansen 2d ago β€’ 0 views

How to Identify Contact and Non-Contact Forces in Daily Life Examples.

Hey there! πŸ‘‹ Ever wonder about the invisible forces all around us? πŸ€” Let's explore contact and non-contact forces with some everyday examples. Get ready to learn and test your knowledge!
πŸ”¬ Science

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carol793 Dec 28, 2025

πŸ“š Quick Study Guide

    πŸ” Contact forces require direct contact between objects to cause a push or pull. Examples include friction, tension, applied force, and air resistance. πŸ’‘ Non-contact forces can exert a force on an object without touching it. Examples include gravity, electric force, and magnetic force. πŸ“ Gravity is the force of attraction between objects with mass. The formula for gravitational force is $F = G \frac{m_1m_2}{r^2}$, where $G$ is the gravitational constant, $m_1$ and $m_2$ are the masses of the objects, and $r$ is the distance between their centers. 🧲 Magnetic force is the attraction or repulsion between magnetic materials. It's strongest at the poles of a magnet. ⚑ Electric force is the attraction or repulsion between electric charges. Like charges repel, and opposite charges attract. 🍎 Identifying forces involves analyzing the situation and determining whether the interaction requires physical touch (contact) or occurs at a distance (non-contact).

πŸ§ͺ Practice Quiz

  1. Which of the following is an example of a contact force?
    1. Gravity
    2. Magnetic Force
    3. Applied Force
    4. Electric Force
  2. A ball is rolling on the ground and eventually comes to a stop. Which force is primarily responsible for stopping the ball?
    1. Gravity
    2. Friction
    3. Magnetic Force
    4. Applied Force
  3. Which of the following is an example of a non-contact force?
    1. Tension in a rope
    2. Air resistance
    3. Gravity
    4. Normal force
  4. What force keeps you on the ground?
    1. Applied Force
    2. Magnetic Force
    3. Gravitational Force
    4. Tension Force
  5. A magnet attracts a paperclip. What type of force is this?
    1. Applied Force
    2. Gravitational Force
    3. Magnetic Force
    4. Frictional Force
  6. A person pushes a box across the floor. Which force is the applied force directly opposing?
    1. Gravity
    2. Normal Force
    3. Friction
    4. Tension
  7. An object with mass $m_1 = 5 \text{ kg}$ and another object with mass $m_2 = 10 \text{ kg}$ are separated by a distance of $r = 2 \text{ m}$. What is the gravitational force between them, given that $G = 6.674 \times 10^{-11} \text{ N(m/kg)}^2$?
    1. $8.34 \times 10^{-10} \text{ N}$
    2. $1.67 \times 10^{-9} \text{ N}$
    3. $3.34 \times 10^{-10} \text{ N}$
    4. $5.00 \times 10^{-9} \text{ N}$
Click to see Answers
  1. C
  2. B
  3. C
  4. C
  5. C
  6. C
  7. A

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