Steven is trying out for the position of pitcher on the baseball team. He can throw the baseball fast! The coach has clocked some of his pitches at 85 mph. Some of Steven's friends decided to play a joke on him and replaced one of the baseballs with one that they tampered with. Instead of a mass of 145 grams, the boys added a lead weight so the mass is now 200 grams. Steven winds up and throws.
All of the statements describe the possible results of this scenario except one. Which statement is an inaccurate explanation?
(1 point)
Responses
Since force equals mass times acceleration, Steven’s throwing force must increase to throw the ball 85 mph.
Since force equals mass times acceleration, Steven’s throwing force must increase to throw the ball 85 mph.
If Steven’s throwing force is constant and the ball’s mass increases, the rate of acceleration will be less.
If Steven’s throwing force is constant and the ball’s mass increases, the rate of acceleration will be less.
Steven must throw the new ball with more force in order for it to achieve the same speed as previous throws.
Steven must throw the new ball with more force in order for it to achieve the same speed as previous throws.
The difference in the mass is not significant and will not affect the force needed to throw the ball 85 mph.
The difference in the mass is not significant and will not affect the force needed to throw the ball 85 mph.
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The statement "If Steven’s throwing force is constant and the ball’s mass increases, the rate of acceleration will be less" is an inaccurate explanation. According to Newton's second law of motion, F = ma, if the force remains constant and the mass increases, the acceleration will actually decrease.
In which situation would the momentum of a moving object increase? (1 point)
Responses
A new force acts on the object, opposing the object’s motion.
A new force acts on the object, opposing the object’s motion.
A force acting in the direction opposite the object’s motion is removed from the object.
A force acting in the direction opposite the object’s motion is removed from the object.
A force acting in the direction of the object’s motion is removed from the object.
A force acting in the direction of the object’s motion is removed from the object.
Two forces of equal magnitude act on the object in opposite directions.
The situation in which the momentum of a moving object would increase is when a force acting in the direction of the object's motion is removed from the object.
Look at each picture and determine whether the example represents balanced or unbalanced forces.(4 points)
unbalanced forces balanced forces
unbalanced forces –
balanced forces –
Forces | CK-12 Foundation
unbalanced forces – Image with alt text: Forces | CK-12 Foundation
balanced forces – Image with alt text: Forces | CK-12 Foundation
unbalanced forces –
balanced forces –
Balanced Forces - 8TH-GRADE SCIENCE
unbalanced forces – Image with alt text: Balanced Forces - 8TH-GRADE SCIENCE
balanced forces – Image with alt text: Balanced Forces - 8TH-GRADE SCIENCE
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It is not possible to determine whether the example represents balanced or unbalanced forces without being able to see the pictures that are being referred to.
Look at each picture and determine whether the example represents balanced or unbalanced forces.(4 points)
I apologize for the confusion, but as an AI language model, I am unable to directly see pictures. Therefore, I cannot determine whether the examples represent balanced or unbalanced forces without visual information. Please provide a verbal description or additional context so I can assist you further.
What does a horizontal line on a position-time graph indicate about the object?
(1 point)
Responses
The object is accelerating.
The object is accelerating.
The object has a constant, nonzero velocity.
The object has a constant, nonzero velocity.
The object remains still.
The object remains still.
The object has a position of zero.
A horizontal line on a position-time graph indicates that the object has a constant, nonzero velocity.
Matt is walking at 1.25 miles per hour to the east. Jaime is walking at 1.25 miles per hour to the south. Which statement describes the movement of Matt and Jaime?(1 point)
Responses
They have different speeds and different velocities.
They have different speeds and different velocities.
They have the same speed and the same velocity.
They have the same speed and the same velocity.
They have different speeds but the same velocity.
They have different speeds but the same velocity.
They have the same speed but different velocities.