Examples of forces Grade 7

📚 Quick Study Guide

• 🍎 Force: A push or pull that can change the motion of an object.
• 💪 Types of Forces:
  • Applied Force: A force applied directly to an object (e.g., pushing a box).
  • Gravitational Force: The force of attraction between objects with mass (e.g., an apple falling from a tree).
  • Frictional Force: A force that opposes motion when two surfaces rub against each other.
  • Tension Force: The force transmitted through a string, rope, cable, or wire when it is pulled tight by forces acting from opposite ends.
  • Normal Force: The support force exerted upon an object that is in contact with another stable object.
  • Air Resistance: The force of air pushing against a moving object.
• 📏 Measuring Force: Measured in Newtons (N).
• ➕ Net Force: The overall force acting on an object. If forces are in the same direction, add them. If they are in opposite directions, subtract them.
• ⚖️ Balanced Forces: When the net force is zero, the object is at rest or moving at a constant velocity.
• 🤸‍♀️ Unbalanced Forces: When the net force is not zero, the object accelerates.

Practice Quiz

1. Which of the following is an example of gravitational force?
   1. A. Pushing a car
   2. B. An apple falling from a tree
   3. C. A book resting on a table
   4. D. A rope being pulled
2. What unit is used to measure force?
   1. A. Kilogram (kg)
   2. B. Meter (m)
   3. C. Newton (N)
   4. D. Second (s)
3. What happens when balanced forces act on an object?
   1. A. The object accelerates
   2. B. The object changes direction
   3. C. The object remains at rest or moves at a constant velocity
   4. D. The object's mass increases
4. Which force opposes the motion of an object when it slides across a surface?
   1. A. Applied Force
   2. B. Gravitational Force
   3. C. Frictional Force
   4. D. Tension Force
5. A person is pulling a box with a force of 50 N to the right, and friction is exerting 10 N to the left. What is the net force on the box?
   1. A. 60 N to the right
   2. B. 40 N to the right
   3. C. 60 N to the left
   4. D. 40 N to the left
6. What type of force is exerted by a rope when it is pulled tight?
   1. A. Normal Force
   2. B. Tension Force
   3. C. Applied Force
   4. D. Air Resistance
7. What is the force that opposes the motion of an object moving through the air?
   1. A. Gravity
   2. B. Friction
   3. C. Air resistance
   4. D. Tension