Forces and Motion Review Questions

📚 Quick Study Guide

• 🍎 Newton's First Law (Law of Inertia): 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.
• 🚀 Newton's Second Law: The acceleration of an object is directly proportional to the net force acting on the object, is in the same direction as the net force, and is inversely proportional to the mass of the object. Formula: $F = ma$, where $F$ is force, $m$ is mass, and $a$ is acceleration.
• 🤝 Newton's Third Law: For every action, there is an equal and opposite reaction.
• 🏋️‍♀️ Force: A push or pull upon an object resulting from the object's interaction with another object. Measured in Newtons (N).
• 📏 Motion: Change in position of an object over time.
• 💨 Friction: A force that opposes motion between two surfaces that are in contact.
• 🌌 Gravity: A force of attraction between objects that have mass. Near Earth's surface, the acceleration due to gravity is approximately $9.8 m/s^2$.

🧪 Practice Quiz

1. Which of Newton's Laws explains why you need to wear a seatbelt in a car?
   1. Newton's First Law
   2. Newton's Second Law
   3. Newton's Third Law
   4. Law of Universal Gravitation
2. What is the force required to accelerate a 10 kg object at 2 m/s²?
   1. 5 N
   2. 12 N
   3. 20 N
   4. 8 N
3. According to Newton's Third Law, if you push against a wall, what happens?
   1. The wall collapses.
   2. The wall pushes back on you with equal force.
   3. The wall accelerates.
   4. Nothing happens.
4. Which of the following is a force that opposes motion?
   1. Inertia
   2. Gravity
   3. Friction
   4. Momentum
5. What is the acceleration of an object with a mass of 5 kg if a force of 25 N is applied to it?
   1. 2 m/s²
   2. 5 m/s²
   3. 10 m/s²
   4. 20 m/s²
6. If an object is at rest, which of the following must be true?
   1. There are no forces acting on it.
   2. The net force acting on it is zero.
   3. The object has a large mass.
   4. The object is in space.
7. A heavier object and a lighter object are dropped from the same height (ignoring air resistance). Which will hit the ground first?
   1. The heavier object
   2. The lighter object
   3. They will hit at the same time
   4. It depends on the shape of the objects