Question

1. some objects (like leaves, feathers, and parachutes) fall at a rate of less than 9.8 m/s/s - what is the force that slows these objects down?
2. something that has a combination of two or more simple machines is called what?
3. what is our definition of a force?
4. what is weight dependent on?

Explanation:

• Question 22: When objects like leaves, feathers, and parachutes fall, air resistance (also known as drag) acts against the direction of their motion. This force opposes gravity and slows them down. In the absence of air resistance (in a vacuum), all objects would fall at the same acceleration (\(9.8\ m/s^{2}\)). But in the presence of air, the surface area and shape of these objects make air resistance significant enough to reduce their acceleration.
• Question 23: A compound machine (or complex machine) is made by combining two or more simple machines. For example, a wheelbarrow combines a lever (the handles) and a wheel - and - axle (the wheel).
• Question 24: A force is a push or a pull that can cause an object to accelerate, change its shape, or change its state of motion (from rest to motion or vice - versa). Mathematically, according to Newton's second law \(F = ma\), where \(F\) is the force, \(m\) is the mass of the object, and \(a\) is the acceleration.
• Question 25: Weight (\(W\)) is given by the formula \(W=mg\), where \(m\) is the mass of the object and \(g\) is the acceleration due to gravity. So, weight is dependent on the mass of the object and the gravitational acceleration of the location (e.g., \(g = 9.8\ m/s^{2}\) on Earth, but different on other planets).

Answer:

• 22. Air resistance (drag).
• 23. Compound machine (complex machine).
• 24. A push or a pull.
• 25. Mass and gravitational acceleration.