Question 1 (3 points)

Question

Question 1 (3 points) 
A football player kicks a ball with a mass of 0.42 kg. The average acceleration of the football was 14.8 m/s². How much force did the kicker supply to the football?

Question 1 options:

6.22 m/s²

6.22 N

35.24 m/s²

35.24 N
2.14 Unit Test: Force and Momentum, Part 1 Pool 2
Question 2 (3 points) 
According to Newton's second law of motion, when an object is acted on by an unbalanced force, how will that object respond?

Question 2 options:

It will stop moving.

It will accelerate.

It will increase velocity.

It will decrease speed.
2.14 Unit Test: Force and Momentum, Part 1 Pool 3
Question 3 (3 points) 
When an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition?

Question 3 options:

stable factors

frictional force

a balanced set of forces

unbalanced forces
2.14 Unit Test: Force and Momentum, Part 1 Pool 4
Question 4 (3 points) 
A tight rope walker who does not want to change his position will want the forces acting on him to be ____________.

Question 4 options:

balanced

large

small

unbalanced
2.14 Unit Test: Force and Momentum, Part 1 Pool 5
Question 5 (3 points) 
The force that every mass exerts on every other mass is called _________.

Question 5 options:

gravity

weight

pull

matter
2.14 Unit Test: Force and Momentum, Part 1 Pool 6
Question 6 (3 points) 
Which of the following best illustrates the role that gravity played in the formation of the solar system?

Question 6 options:

Gravity allowed the nebula to expand and move outward.

Gravity caused the nebula to cool enough for planets to form.

Gravity removed excess gas and dust from the cores of the planets.

Gravity pulled particles of dust and gas together to form planets.
2.14 Unit Test: Force and Momentum, Part 1 Pool 7
Question 7 (3 points) 
Which statement is true because of Newton's second law?

Question 7 options:

When the net force on an object increases, the object's acceleration decreases.

When the net force on an object decreases, the object's acceleration decreases.

When the net force on an object decreases, the acceleration doesn't change.

When the net force on an object decreases, the object's acceleration increases.

2.14 Unit Test: Force and Momentum, Part 1 Pool 8
Question 8 (3 points) 
When a bat hits a ball, the impulse is

Question 8 options:

the mass multiplied by the acceleration.

the change in velocity multiplied by the force.

the force applied to an object. Mass times velocity

the mass multiplied by the force.

2.14 Unit Test: Force and Momentum, Part 1 Pool 9
Question 9 (3 points) 
A baseball is traveling (+20 m/s) and is hit by a bat. It leaves the bat traveling (-30 m/s). What is the change in the velocity?  Remember that direction is what makes velocity different than speed.

Question 9 options:

50 m/s

30 m/s

20 m/s

10 m/s

2.14 Unit Test: Force and Momentum, Part 1 Pool 10
Question 10 (3 points) 
What makes some collisions elastic and others inelastic?

Question 10 options:

If the collision involves bouncing, it is elastic.

If the collision involves sticking together, it is elastic.

If there is no loss of kinetic energy in the collision, it is elastic.

If there is energy lost in the collision to sound, heat, etc., the collision is elastic.

GPT-4o mini · Answer

Here are the answers to your questions:

Question 1: To calculate the force, we use Newton's second law: \( F = m \cdot a \).

Mass \( m = 0.42 , \text{kg} \)
Acceleration \( a = 14.8 , \text{m/s}^2 \) So, \[ F = 0.42 , \text{kg} \times 14.8 , \text{m/s}^2 = 6.22 , \text{N} \] Answer: 6.22 N

Question 2: According to Newton's second law, when an object is acted on by an unbalanced force, it will: Answer: It will accelerate.

Question 3: When an object moves, stops moving, changes speed, or changes direction, scientists describe that condition as: Answer: unbalanced forces.

Question 4: A tightrope walker who does not want to change his position will want the forces acting on him to be: Answer: balanced.

Question 5: The force that every mass exerts on every other mass is called: Answer: gravity.

Question 6: Which of the following best illustrates the role that gravity played in the formation of the solar system? Answer: Gravity pulled particles of dust and gas together to form planets.

Question 7: Which statement is true because of Newton's second law? Answer: When the net force on an object decreases, the object's acceleration decreases.

Question 8: When a bat hits a ball, the impulse is: Answer: the mass multiplied by the change in velocity.

Question 9: A baseball is traveling (+20 m/s) and is hit by a bat and leaves the bat traveling (-30 m/s). The change in velocity is calculated as follows: Change in velocity = final velocity - initial velocity = (-30 m/s) - (+20 m/s) = -30 m/s - 20 m/s = -50 m/s The change in velocity is 50 m/s (the negative sign indicates a change in direction). Answer: 50 m/s

Question 10: What makes some collisions elastic and others inelastic? Answer: If there is no loss of kinetic energy in the collision, it is elastic.

Feel free to ask if you have any more questions!