Skating Flashcards
What is inertia?
The principle that an object at rest tends to remain at rest and that an object in motion tends to remain in motion.
Why does a motionless skater tend to remain motionless? Why does a moving skater tend to continue moving?
Because of inertia.
How can we describe the fluid, effortless motion of a coasting skater?
A coasting skater moves at a constant velocity.
Define and give three examples of vector quantities.
Vector quantity: a physical quantity that has both an amount and a direction. ex: position, velocity, and force
What is position? What does it require to measure it?
Position: the measure of an object’s location is space. It requires a reference point, a distance, and a direction. It is measured in meters.
What is velocity?
The rate at which an object’s position is changing with time. measured in meters/second
What is force?
The physics term for a push or a pull. measured in newtons.
What is Newton’s first law of motion?
An object that is free of external forces moves a constant velocity.
How does a skater start, stop, or turn?
A force acts on the skater causing them to accelerate
What is acceleration?
the rate at which an object’s velocity is changing with time. measured in meters/second^2.
What is deceleration?
acceleration opposite your velocity
What is net force?
the sum of all forces acting on an object
What is mass?
The measure of an object’s inertia. An object’s resistance to acceleration.
What is Newton’s second law of motion?
acceleration = net force / mass OR net force = mass * acceleration
Why does a skater need ice or wheels to skate?
real-world complications often mask inertia and newton’s first law. they need wheels to eliminate friction
