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.
The object has a constant, nonzero velocity.
In which situation would the momentum of a moving object increase? (1 point) Responses A force act
In which situation would the momentum of a moving object increase? (1 point)
Responses
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.
Two forces of equal magnitude act on the object in opposite directions.
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.
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
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.
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.
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.
The difference in the mass is not significant and will not affect the force needed to throw the ball 85 mph.
Marla rolled a basketball into a soccer ball. The blue arrow represents the speed of the basketball as it rolled toward the soccer ball. After the collision, how did the speed of the two balls change? Note that the size of the arrow indicates the speed of the ball.
Since there is no visual representation provided, it is not possible to determine how the speed of the two balls changed after the collision.
For each statement below, indicate which of Newton's Three Laws the statement represents. (7 points)
Newton's 1st Law Newton's 2nd Law Newton's 3rd Law
When riding the bumper cars at the fair, you bump into your friend and your car bounces backwards.
Newton's 1st Law – When riding the bumper cars at the fair, you bump into your friend and your car bounces backwards.
Newton's 2nd Law – When riding the bumper cars at the fair, you bump into your friend and your car bounces backwards.
Newton's 3rd Law – When riding the bumper cars at the fair, you bump into your friend and your car bounces backwards.
A ball is rolling straight across the floor until Bradley kicks it.
Newton's 1st Law – A ball is rolling straight across the floor until Bradley kicks it.
Newton's 2nd Law – A ball is rolling straight across the floor until Bradley kicks it.
Newton's 3rd Law – A ball is rolling straight across the floor until Bradley kicks it.
A bowling ball and a baseball both roll across your foot at the same speed. The bowling ball hurts much more.
Newton's 1st Law – A bowling ball and a baseball both roll across your foot at the same speed. The bowling ball hurts much more.
Newton's 2nd Law – A bowling ball and a baseball both roll across your foot at the same speed. The bowling ball hurts much more.
Newton's 3rd Law – A bowling ball and a baseball both roll across your foot at the same speed. The bowling ball hurts much more.
Your car breaks down. As your friends help you push it, it begins to move and speed up.
Newton's 1st Law – Your car breaks down. As your friends help you push it, it begins to move and speed up.
Newton's 2nd Law – Your car breaks down. As your friends help you push it, it begins to move and speed up.
Newton's 3rd Law – Your car breaks down. As your friends help you push it, it begins to move and speed up.
A fireman turns on his hose and is knocked backwards.
Newton's 1st Law – A fireman turns on his hose and is knocked backwards.
Newton's 2nd Law – A fireman turns on his hose and is knocked backwards.
Newton's 3rd Law – A fireman turns on his hose and is knocked backwards.
A soccer ball will not move until a player kicks it.
Newton's 1st Law – A soccer ball will not move until a player kicks it.
Newton's 2nd Law – A soccer ball will not move until a player kicks it.
Newton's 3rd Law – A soccer ball will not move until a player kicks it.
F = ma
Newton's 1st Law – F = ma
Newton's 2nd Law – F = ma
Newton's 3rd Law – F = ma
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When riding the bumper cars at the fair, you bump into your friend and your car bounces backwards.
- Newton's 3rd Law
A ball is rolling straight across the floor until Bradley kicks it.
- Newton's 2nd Law
A bowling ball and a baseball both roll across your foot at the same speed. The bowling ball hurts much more.
- Newton's 2nd Law
Your car breaks down. As your friends help you push it, it begins to move and speed up.
- Newton's 2nd Law
A fireman turns on his hose and is knocked backwards.
- Newton's 2nd Law
A soccer ball will not move until a player kicks it.
- Newton's 1st Law
F = ma
- Newton's 2nd Law