please check these:
1. which of the following statements applies to the motion of a ball rising and then falling in free fall?
I.The ball has constant acceleration as it moves upward.
II.The ball has constant acceleration at the top of its path.
III.The ball has constant acceleration as it moves upward.
my answer is I, II, and III
2. Objects that are falling toward Earth in free fall move
a. faster and faster
b. slower and slower
c. at a constant velocity
d. slower then faster
i chose A
3. Which would fall with greater accleration in a vaccum--a leaf or a stone?
my answer is they would accelerate at the same rate
4. Which of the following is a physical quantity that has a magnitude but no direction
my answer is Scalar
5. which of the following is a physical quantity that has both magnitude and direction?
my answer is Vector
6. Acceleration due to gravity is also called
my answer is free-fall acceleration
All are correct. Good thinking!
1. Your answer is correct. All of the statements apply to the motion of a ball rising and then falling in free fall.
2. Your answer is correct. Objects falling toward Earth in free fall move faster and faster.
3. Your answer is correct. Both the leaf and the stone would accelerate at the same rate in a vacuum.
4. Your answer is correct. A physical quantity that has a magnitude but no direction is called a scalar.
5. Your answer is correct. A physical quantity that has both magnitude and direction is called a vector.
6. Your answer is correct. Acceleration due to gravity is also called free-fall acceleration.
1. Your answer is correct. The statements I, II, and III all apply to the motion of a ball rising and then falling in free fall.
2. Your answer is correct. Objects that are falling toward Earth in free fall move faster and faster.
3. Your answer is correct. In a vacuum, both a leaf and a stone would accelerate at the same rate.
4. Your answer is correct. A physical quantity that has a magnitude but no direction is called scalar.
5. Your answer is correct. A physical quantity that has both magnitude and direction is called vector.
6. Your answer is correct. Acceleration due to gravity is also called free-fall acceleration.
1. To determine which statements apply to the motion of a ball rising and then falling in free fall, let's analyze each statement:
- Statement I: "The ball has constant acceleration as it moves upward." This statement is incorrect because when the ball moves upward, its acceleration will be negative due to the force of gravity acting against it.
- Statement II: "The ball has constant acceleration at the top of its path." This statement is correct because at the highest point of its trajectory, the ball momentarily stops moving upward and starts moving downward. During this instant, the acceleration is zero.
- Statement III: "The ball has constant acceleration as it moves downward." This statement is correct because once the ball starts falling, it accelerates downward due to the force of gravity.
Based on this analysis, the correct answer is II and III.
2. To determine how objects falling toward Earth in free fall move, we need to understand the concept of free fall. In free fall, objects only experience the force of gravity, and no other forces are acting on them.
Considering this, the correct answer is option "a. faster and faster." Objects in free fall accelerate due to the gravitational force. As they fall, the force of gravity causes an increase in their velocity, resulting in faster and faster motion.
3. To determine which would fall with greater acceleration in a vacuum, let's apply Newton's second law of motion, which states that acceleration is directly proportional to the net force applied to an object and inversely proportional to its mass.
Since both the leaf and the stone experience the same force of gravity, their acceleration will depend on their masses. Assuming the stone has a greater mass than the leaf, according to Newton's second law, the stone would fall with greater acceleration in a vacuum.
So, the correct answer is the stone.
4. A physical quantity that has a magnitude but no direction is called a scalar. Scalars are quantities that can be described solely by their magnitude, such as time, mass, distance, and temperature. They do not have any directional component.
Hence, the correct answer is scalar.
5. A physical quantity that has both magnitude and direction is called a vector. Vectors are quantities that require both magnitude and direction to be fully described. Examples of vectors include displacement, velocity, acceleration, force, and momentum.
So, the correct answer is vector.
6. Acceleration due to gravity is also known as free-fall acceleration because it represents the acceleration experienced by objects in free fall near the surface of the Earth. The value of free-fall acceleration is approximately 9.8 m/s² and is denoted by the symbol "g".
Therefore, the correct answer is "free-fall acceleration."