Free Body Diagram Quiz: Test Your Understanding of Forces

📚 Quick Study Guide

• 🍎 What is a Free Body Diagram (FBD)? A visual representation of all forces acting on an object.
• ➡️ Forces: Represented by arrows indicating magnitude and direction.
• ⚓ Key Forces:
  • Weight ($W = mg$, where $m$ is mass and $g$ is acceleration due to gravity).
  • Normal Force ($N$): Perpendicular to the surface.
  • Tension ($T$): Force exerted by a string or rope.
  • Friction ($f$): Opposes motion; $f = \mu N$, where $\mu$ is the coefficient of friction.
  • Applied Force ($F_{app}$): External force acting on the object.
• 📐 Drawing an FBD:
  1. Isolate the object.
  2. Draw a dot representing the object.
  3. Draw arrows representing each force acting on the object.
  4. Label each force.
• 💡 Newton's Laws:
  • First Law: An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a force.
  • Second Law: $F_{net} = ma$, where $F_{net}$ is the net force, $m$ is mass, and $a$ is acceleration.

🧪 Practice Quiz

1. A book is resting on a table. Which forces are acting on the book?

   1. Normal force only
   2. Weight only
   3. Normal force and weight
   4. Applied force and friction

2. A box is being pulled to the right with a force of 50N. Friction is acting on the box with a force of 10N. What is the net force on the box?

   1. 10N
   2. 40N
   3. 50N
   4. 60N

3. A ball is hanging from a string. Which force is acting upwards on the ball?

   1. Weight
   2. Tension
   3. Normal force
   4. Friction

4. A car is accelerating forward. Which force propels the car forward?

   1. Weight
   2. Normal force
   3. Friction
   4. Applied force

5. An object is in equilibrium. What is the net force acting on it?

   1. Equal to its weight
   2. A non-zero value
   3. Zero
   4. Equal to the normal force

6. What is the direction of the normal force on an object resting on an inclined plane?

   1. Parallel to the inclined plane
   2. Perpendicular to the inclined plane
   3. Vertically upwards
   4. Vertically downwards

7. A block is sliding down an inclined plane at a constant speed. What can you say about the friction force?

   1. It is zero
   2. It is greater than the component of weight down the plane
   3. It is equal to the component of weight down the plane
   4. It is less than the component of weight down the plane