A line of dominos is knocked down. Which explanation is true? (1 point)
Responses
An increase in force caused an increase in acceleration.
An increase in force caused an increase in acceleration.
An increase in force caused a decrease in acceleration.
An increase in force caused a decrease in acceleration.
An increase in acceleration caused an increase in force.
An increase in acceleration caused an increase in force.
An increase in acceleration caused a decrease in force.
An increase in force caused an increase in acceleration.
When raindrops form, the force of gravity pulls them toward the ground. Which statement is correct about this chain of events?(1 point)
Responses
There is no correlation between gravity and raindrops falling.
There is no correlation between gravity and raindrops falling.
The force of gravity causes the raindrops to accelerate.
The force of gravity causes the raindrops to accelerate.
There is a negative correlation between gravity and raindrops falling.
There is a negative correlation between gravity and raindrops falling.
The raindrops' acceleration causes the force of gravity.
The force of gravity causes the raindrops to accelerate.
A student observes that for the same net force, heavier objects accelerate less. Which statement describes a correct conclusion?(1 point)
Responses
An increase in acceleration causes the mass to increase.
An increase in acceleration causes the mass to increase.
There is a negative correlation between mass and acceleration.
There is a negative correlation between mass and acceleration.
There is a positive correlation between mass and acceleration.
There is a positive correlation between mass and acceleration.
An decrease in acceleration causes the mass to increase.
There is a negative correlation between mass and acceleration.
A nonzero net force acts on a moving ball, and the ball comes to a stop. Which statement is correct about the relationship between the net force and the ball's movement?(1 point)
Responses
A decrease in acceleration causes the net force to be nonzero because causation works in both directions.
A decrease in acceleration causes the net force to be nonzero because causation works in both directions.
The net force causes an increase in acceleration because without the force the ball's velocity would remain the same.
The net force causes an increase in acceleration because without the force the ball's velocity would remain the same.
The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.
The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.
An increase in acceleration causes the net force to be nonzero because causation works in both directions.
The net force causes a decrease in acceleration because without the force the ball's velocity would remain the same.
A student places five books next to each other on their ends. She then pushes the first book with her finger, and a few seconds later, the last book falls. Which statement is correct about this chain of events?(1 point)
Responses
There is causation between the force of the finger and the number of books.
There is causation between the force of the finger and the number of books.
The acceleration of the books as they fall causes the force of the finger.
The acceleration of the books as they fall causes the force of the finger.
There is a positive correlation between the force of the finger and number of books.
There is a positive correlation between the force of the finger and number of books.
The force of the finger causes the books to accelerate and fall.
The force of the finger causes the books to accelerate and fall.
If multiple forces are acting on an object, which statement is always true?(1 point)
Responses
The acceleration will be directed in the direction of the gravitational force.
The acceleration will be directed in the direction of the gravitational force.
The acceleration will be directed in the direction of the applied force.
The acceleration will be directed in the direction of the applied force.
The acceleration will be directed in the direction of the normal force.
The acceleration will be directed in the direction of the normal force.
The acceleration will be directed in the direction of the net force.
The acceleration will be directed in the direction of the net force.
If a ball is accelerating down through the air with no horizontal motion, what must be true about the net forces acting on the ball?(1 point)
Responses
The net force on the ball is directed upward.
The net force on the ball is directed upward.
The gravitational force is greater than the drag.
The gravitational force is greater than the drag.
The net force on the ball is zero.
The net force on the ball is zero.
The drag is greater than the gravitational force.
The drag is greater than the gravitational force.
The net force on the ball is directed downward (opposite to the direction of acceleration).
A boy who exerts a 300-N force on the ice of a skating rink is pulled by his friend with a force of 75 N, causing the boy to accelerate across the ice. If drag and the friction from the ice apply a force of 5 N on the boy, what is the magnitude of the net force acting on him?(1 point)
Responses
370 N
370 N
80 N
80 N
380 N
380 N
70 N
The magnitude of the net force acting on the boy can be found by adding up all the forces acting on him.
Net force = Force applied by the boy + Force applied by the friend + Force of drag and friction
Net force = 300 N + 75 N - 5 N
Net force = 370 N
Therefore, the magnitude of the net force acting on the boy is 370 N.
Four friends push on the same block in different directions. Allie pushes on the block to the north with a force of 18 N. Bill pushes on the block to the east with a force of 14 N. Chris pushes on the block to south with a force of 23 N. Debra pushes on the block to the west with a force of 20 N. Assuming it does not move vertically, in which directions will the block move?(1 point)
Responses
north and west
north and west
south and west
south and west
north and east
north and east
south and east
To determine the direction of movement of the block, we need to consider the net force acting on it.
The forces can be broken down into their north-south and east-west components:
North-South forces: -18 N (Allie pushing north) + 23 N (Chris pushing south) = 5 N southward force
East-West forces: 14 N (Bill pushing east) - 20 N (Debra pushing west) = -6 N westward force
The net force in the southward direction is greater than the net force in the northward direction. However, the net force in the westward direction is greater than the net force in the eastward direction.
Therefore, the block will move in the south and west directions.
wTwo teams are playing tug of war. The tables show the members of each team and how much pulling force each team member applies to the rope.
Team A
Members
Pulling Force
(N)
Darlene 360
Eric 400
Keshawn 450
Team B
Members
Pulling Force
(N)
Anita 350
Frank 390
Molly 490
If Team A pulls to the right and Team B pulls to the left, what is the total horizontal net force applied to the rope?
(1 point)
Responses
40 N to the left
40 N to the left
20 N to the left
20 N to the left
40 N to the right
40 N to the right
20 N to the right
20 N to the right
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To determine the total horizontal net force, we need to subtract the total force exerted by Team B from the total force exerted by Team A.
Total force exerted by Team A: 360 N + 400 N + 450 N = 1210 N (to the right)
Total force exerted by Team B: 350 N + 390 N + 490 N = 1230 N (to the left)
To find the net force, we subtract the force exerted by Team B from the force exerted by Team A:
Net force = Total force exerted by Team A - Total force exerted by Team B
Net force = 1210 N - 1230 N = -20 N
Therefore, the total horizontal net force applied to the rope is 20 N to the left.