Free Fall Quiz with Answers: Test Your Understanding

📚 Quick Study Guide

• 🍎 Definition: Free fall is the motion of an object where gravity is the only force acting upon it. Air resistance is negligible.
• 📏 Acceleration: The acceleration due to gravity, denoted as 'g', is approximately $9.8 m/s^2$ on Earth.
• 💡 Key Formulas:
  • Velocity: $v = v_0 + gt$, where $v_0$ is the initial velocity.
  • Position: $y = y_0 + v_0t + \frac{1}{2}gt^2$, where $y_0$ is the initial position.
  • Velocity-Displacement: $v^2 = v_0^2 + 2g(y - y_0)$.
• ⏱️ Important Note: These formulas assume constant acceleration due to gravity and negligible air resistance.
• 🎯 Assumptions: Problems usually assume we are close to the Earth's surface and can use a constant 'g'.

🧪 Practice Quiz

1. What is the acceleration of an object in free fall near the Earth's surface, neglecting air resistance?
   1. $0 m/s^2$
   2. $4.9 m/s^2$
   3. $9.8 m/s^2$
   4. $19.6 m/s^2$
2. An object is dropped from rest. What is its velocity after 3 seconds, assuming $g = 9.8 m/s^2$?
   1. $9.8 m/s$
   2. $19.6 m/s$
   3. $29.4 m/s$
   4. $39.2 m/s$
3. If an object is thrown upwards, at what point is its velocity zero?
   1. As soon as it is released
   2. Halfway to its maximum height
   3. At its maximum height
   4. Just before it hits the ground
4. An object is dropped from a height of 20 meters. How long does it take to reach the ground, assuming $g = 9.8 m/s^2$ and neglecting air resistance?
   1. 1.02 s
   2. 2.02 s
   3. 3.02 s
   4. 4.02 s
5. What force is primarily responsible for an object's acceleration during free fall (neglecting air resistance)?
   1. Applied Force
   2. Tension Force
   3. Frictional Force
   4. Gravitational Force
6. Which of the following is NOT a valid assumption when solving simple free fall problems?
   1. Constant acceleration due to gravity
   2. Negligible air resistance
   3. The object has a very high mass
   4. Motion is only in one dimension (vertical)
7. A ball is thrown upwards with an initial velocity of 15 m/s. What is its displacement after 2 seconds (assuming $g = 9.8 m/s^2$)?
   1. 10.4 m
   2. 20.4 m
   3. 30 m
   4. 59.6 m