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 drag is greater than the gravitational force. The drag is greater than the gravitational force. The net force on the ball is zero. The net force on the ball is zero. 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 net force on the ball is directed upward.
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 70 N 70 N 380 N
To find the magnitude of the net force acting on the boy, we need to consider all the forces acting on him.
The force exerted by the boy himself is 300 N, and the force exerted by his friend is 75 N. The drag and friction forces acting on the boy are 5 N.
The net force is the vector sum of all these forces.
Net force = Force exerted by the boy + Force exerted by his friend + Drag force + Friction force
Net force = 300 N + 75 N + 5 N
Net force = 380 N
So, the magnitude of the net force acting on the boy is 380 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 south and west south and west south and east south and east north and east north and east north and west
To determine the direction in which the block will move, we need to find the resultant force by adding up the individual forces in each direction.
In the north-south direction, the forces are opposite in direction. Allie pushes north with 18 N, and Chris pushes south with 23 N. The net force in the north-south direction is given by:
Net force in the north-south direction = Force north - Force south
Net force in the north-south direction = 18 N - 23 N
Net force in the north-south direction = -5 N
In the east-west direction, the forces are again opposite in direction. Bill pushes east with 14 N, and Debra pushes west with 20 N. The net force in the east-west direction is given by:
Net force in the east-west direction = Force east - Force west
Net force in the east-west direction = 14 N - 20 N
Net force in the east-west direction = -6 N
From the net forces calculated, we can see that the block will move in the direction of the net force.
Therefore, the block will move in the south and west directions as the net force in those directions is non-zero.
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 south and west
south and east
north and east
north and west
The block will move in the direction of the net force acting on it. To determine the net force, we need to break down the forces into their respective components.
In the north-south direction, Allie pushes with a force of 18 N towards the north, and Chris pushes with a force of 23 N towards the south. The net force in the north-south direction is:
Net force in the north-south direction = Force north - Force south
Net force in the north-south direction = 18 N - 23 N
Net force in the north-south direction = -5 N (south direction)
In the east-west direction, Bill pushes with a force of 14 N towards the east, and Debra pushes with a force of 20 N towards the west. The net force in the east-west direction is:
Net force in the east-west direction = Force east - Force west
Net force in the east-west direction = 14 N - 20 N
Net force in the east-west direction = -6 N (west direction)
Therefore, the block will move in the south (north-south direction) and west (east-west direction) directions.
Two 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?
To find the total horizontal net force applied to the rope, we need to add up the individual forces in each direction.
For Team A, the total pulling force to the right is given by:
Total pulling force to the right for Team A = Darlene's pulling force + Eric's pulling force + Keshawn's pulling force
Total pulling force to the right for Team A = 360 N + 400 N + 450 N
Total pulling force to the right for Team A = 1210 N
For Team B, the total pulling force to the left is given by:
Total pulling force to the left for Team B = Anita's pulling force + Frank's pulling force + Molly's pulling force
Total pulling force to the left for Team B = 350 N + 390 N + 490 N
Total pulling force to the left for Team B = 1230 N
To find the total horizontal net force, we subtract the total pulling force to the left (Team B) from the total pulling force to the right (Team A):
Total horizontal net force = Total pulling force to the right - Total pulling force to the left
Total horizontal net force = 1210 N - 1230 N
Total horizontal net force = -20 N
Thus, the total horizontal net force applied to the rope is -20 N (to the left).