10 Questions
What is the maximum number of dogs a musher can start the Iditarod race with?
16 dogs
Why do mushers want to finish the race with as many dogs as possible?
To have more dogs to pull the sled
What happens if a dog gets sick or injured during the race?
The musher can leave the dog with a veterinarian and continue the race with their remaining dogs
How is the net force on an object found when multiple forces are acting on it?
By adding the forces acting in the same direction
What is the net force when three people push a van with forces of 100 N, 125 N, and 200 N, all in the forward direction?
425 N
What is the direction of the net force on the leash when the dog pulls with 75 N and the girl pulls back with 50 N?
Forward
In which scenario is the net force on an object equal to one force on the object?
A train of cars on a roller coaster coming to a stop at the end of a ride
What happens to the acceleration of the train when brakes are applied to slow it down?
The acceleration becomes negative
How does finding the net force help in predicting an object's motion?
It helps in predicting how the object's motion will change
What is the net force on an object if all forces acting on it are very small?
It is equal to one of the small forces
Study Notes
Iditarod Dog Sled Racing
- Iditarod mushers can start the race with up to 16 dogs pulling the sled and must finish with at least 5 dogs.
- Mushers take good care of their dogs to prevent illness or injury during the race.
- If a dog gets sick or injured, mushers can leave it with veterinarians and continue the race with their remaining dogs.
Forces in Dog Sled Racing
- Each dog in a dog sled team exerts a force on the sled, and the forces add up to a large force on the sled.
- The sum of all forces acting on an object is the net force on the object.
Forces and Directions
- Forces have both strength and direction.
- When forces act in the same direction, their strengths are added.
- When forces act in opposite directions, their strengths are subtracted to find the net force.
Examples of Forces and Net Force
- When multiple people push a van in the same direction, the net force is the sum of their individual forces.
- When forces act in opposite directions, the net force is the difference between the forces, and its direction is the same as the larger force.
- In a scenario where a dog pulls a leash with a force of 75 N and a girl pulls back with a force of 50 N, the net force on the leash is 25 N in the forward direction.
Predicting Motion with Net Force
- Finding the net force is useful for predicting the effect of all forces on an object at once.
- The net force can be used to predict if and how the object's motion will change.
- In a scenario where a train is slowed down by brakes, the net force on the train is negative, causing the train to slow down.
Learn about the constraints that Iditarod mushers have on the number of dogs they can use during the race, the rules regarding starting and finishing with a certain number of dogs, and how they take care of their dogs to prevent illness or injury.
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