A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the forcerequired to keep
1 answer:
Answer:
Zero Newtons
Explanation:
Newton's second law of motion states that the net force applied to an object is equal to the product between the object's mass and its acceleration:
In this case, we want the hockey puck to slide at constant velocity - constant velocity means zero acceleration:
a = 0
And so this means also that the net force is zero:
F = 0
However, the problem says that ice friction and air resistance are negligible - so there are no forces acting on the hockey puck. This means that the puck will continue its motion at constant velocity if we don't apply any other force on it.
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Answer:
Circle
Explanation:
When a charged particle is in motion in a region with magnetic field, the particle experiences a force whose magnitude is given by
where
q is the charge
v is the velocity of the particle
B is the strength of the magnetic field
is the angle between the directions of v and B
In this problem, the velocity of the particle is perpendicular to the magnetic field, so
and the formula reduces to
Also, the direction of this force is perpendicular to the direction of motion of the particle. This means that as the charge moves in the region of the magnetic field, the force acting on it acts as a centripetal force: therefore, the particle will start moving by unifom circular motion, with constant speed (because the magnetic force does no work on the particle, since it is perpendicular to the direction of motion).
So, the path of the particle will be a circle.