When a spinning ice skater pulls in his arms, he spins faster because _________. B - His angular momentum must be conserved, so reducing his radius must increase his speed of rotation. Choose the correct definition and two examples of kinetic energy: A - Kinetic energy is the energy an object has due to its motion.
Why does a figure skater spin faster if he pulls his arms and legs in quizlet?
When a figure skater draws her arms and a leg inward, she reduces the distance between the axis of rotation and some of her mass, reducing her moment of inertia. Since angular momentum is conserved, her rotational velocity must increase to compensate.
Which law explains why a skater can spin faster by pulling his arms closer to his body or spin slower by spreading his arms out?
The principle of the conservation of angular momentum holds that an object's angular momentum will stay the same unless acted upon by an outside force. This explains why a figure skater spins faster when she tucks her arms in close to her body.
Which law explains why a skater can spin faster by pulling his arms closer to his body or spin slower by spreading his arms out quizlet?
Newton's second law of motion.
What force causes a skater on the ice to gradually slow down?
As he reaches the bottom, friction causes him to slow down and stop.
18 related questions foundWhat causes acceleration?
The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
What is the unbalanced force that slows down a ball rolling across the floor?
The friction force acts in the opposite direction to the motion of the ball, slowing it and eventually stopping it.
How does a rocket launch upward quizlet?
As rockets lift off, they burn fuel & it pushes exhaust gases with a downward force against the earth and the gases push upward on the rocket in an equal and opposite force called thrust. Thrust has to be greater than the force of gravity for a rocket to lift off.
Which of the following best explains why the Moon's orbital period and rotation period are the same?
Which of the following best explains why the Moon's orbital period and rotation period are the same? The law of conservation of angular momentum ensured that the Moon must have the same amount of rotational angular momentum as it has of orbital angular momentum.
What would happen if a rocket were launched with a speed greater than Earths escape velocity?
What would happen if the Space Shuttle were launched with a speed greater than Earth's escape velocity? It would travel away from Earth into the solar system.
What happens when a spinning ice skater draws in her outstretched arms?
Her angular momentum increases. Her moment of inertia decreases causing her to speed upHer moment of inertia decreases causing her to slow down.
What does the skater physically do to make themselves spin faster or slower?
When a skater performs a dazzling spin, they control their rotational speed by pulling their arms in to decrease the moment of inertia and speed up rotation or spreading them out to decrease moment of inertia and slow rotation.
What will happen if an ice skater spinning on one of her toes extends her arms?
If an ice skater spinning on one of her toes extends her arms, her moment of inertia will increase but her angular velocity will decrease.
When an ice skater who is doing a spin pulls her arms in?
When this person extends her arms, her moment of inertia increases and her angular velocity decreases. An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two.
When a spinning figure skater pulls her arms in closer to her axis of rotation Her angular momentum is?
If a figure skater starts spinning slowly with her arms and possibly one leg extended, she initially has a high moment of inertia and a low angular velocity. If she pulls her arms and leg in closer to her rotational axis, her moment of inertia decreases.
When an ice skater spins and increases her rotation rate by pulling her arms and leg in what happens to her rotational kinetic energy?
Closed 1 year ago. There is a classic example that a spinning skater pulls his arms back. The angular momentum is conserved, the moment of inertia decreases. And therefore, it's angular velocity increases, so the rotational kinetic energy will increase.
What do we mean by the orbital energy of an orbiting object?
What do we mean by the orbital energy of an orbiting object (such as a planet, moon, or satellite)? Orbital energy is the sum of the object's kinetic energy and its gravitational potential energy as it moves through its orbit.
Why does a geostationary satellite must orbit Earth in 1 sidereal day rather than 1 solar day?
Why does a geostationary satellite must orbit Earth in 1 sidereal day, rather than 1 solar day? Actual period of the Earth's rotation is sidereal day. Solar day is a bit longer because of the Earth's orbital motion.
Which statement must be true for a rocket to travel from Earth to another planet?
Which statement must be true in order for a rocket to travel from Earth to another planet? It must carry a lot of extra fuel.
When a rocket rises what causes the action force?
When a rocket rises, what causes the reaction force? the gas pushes with an opposite force on the rocket. It's the reaction force! When a rocket lifts off the ground, the net force is an upward direction.
How does Newton's third law explain how a rocket is launched upward quizlet?
How do rockets lift off the ground? Rockets and space shuttles lift into space using Newton's third law of motion. A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite reaction force on the rocket.
How does a rocket have liftoff in terms of action reaction pairs?
How do action-reaction pairs explain how a rocket lifts off? Action force = A rocket exerts a downward force on exhaust gases. reaction force= exhaust gases exert an equal and opposite force on the rocket, moving it upward. As a rocket travels upward from Earth, air resistance decreases along with the force of gravity.
Why does a rolling ball slow down?
A ball rolling on a horizontal surface slows down as it rolls, due to rolling friction. The friction force is due to static friction so no net work is done by that force, and it does not act to dissipate energy.
What force makes the ball keep on rolling?
General Science
The friction allowing the ball to roll instead of slide. As we know the inertia allows the ball to keep rolling. Friction act on ball and ground that allow the ball to roll.
What forces act on a rolling ball?
The forces on a rolling ball include a horizontal friction force, F , and the normal reaction force, N , acting a distance S ahead of the center of the ball.
