WORK AND
KINETIC ENERGY
: Objects acquire kinetic energy when acted upon by a force. In the case of a billiard ball being struck by another, the force acts over a very short distance, but is very sharp. A car will acquire kinetic energy as its wheels are acted upon by the friction force of the pavement.
Which form of energy causes a ball to hit the other balls on a poll table?
Without a collision (an external force) the objects will not move. The collision of another ball into the group of billiard balls in the picture below will carry its
kinetic energy
into the group and transfer that energy to all of the ones sitting still.
What type of energy is a ball hitting another ball?
The
kinetic energy
of an object is the energy it possesses due to its motion. The kinetic energy of the ball will continue increasing as the ball gains momentum, until it finally collides with a surface. When the ball collides, the kinetic energy is transformed into other forms of energy.
When a ball at a billiard table hits another ball?
They are hard to find, but when one billiard ball hits another, it comes pretty close. When one ball hits another,
it typically makes a sound
. But the energy lost as sound is very small compared to the total energy. Since this energy loss is so small, it is usually ignored.
What forces are acting on the billiard balls in the frame?
The force acting on the ball has two components. One is
the normal reaction force, N
, acting in a direction perpendicular the surface. The other is the friction force, F, acting parallel to the surface. The two forces together have a resultant or total value T which acts in the squirt direction – or vice versa.
What type of energy did the balls have just before they were released?
Lifting a ball into the air before dropping it gives it a type of energy called ‘
potential energy
‘ – which means the ball has the potential to do some work. When you drop the ball, it gains ‘kinetic’ energy (the energy of motion) and loses its potential energy.
What happens when two billiard balls collide?
When two billiard balls collide the
collision is nearly elastic
. An elastic collision is one in which the kinetic energy of the system is conserved before and after impact. … For collisions between balls, momentum is always conserved (just like in any other collision).
Do heavier balls bounce higher?
A well-inflated ball
bounces better
because it has more air inside. … When the lighter ball bounces on the heavy ball they exchange energy, and the lighter ball flies off with some of the energy of a heavier ball. It reaches way higher than from the height it was released.
Which ball bounces higher when dropped together?
Explanation: When all three balls are dropped from the same height,
the rubber ball
will bounce the highest because it has the greatest elasticity. When the rubber ball hits the ground it gets compressed, or squished, and because it is very elastic, it quickly returns to its original shape.
Where does the energy go when a ball stops bouncing?
When you drop a ball, gravity pulls it toward the floor. The ball gains energy of motion, known as kinetic energy. When the ball hits the floor and stops, that energy has to go somewhere. The energy goes into
deforming the ball–
from its original round shape to a squashed shape.
Why do pool balls eventually come to a stop?
When you roll a ball on the ground, the electrons in the atoms on the surface of the ground push against the electrons in the atoms on the surface of your ball that is touching the ground. A rolling ball stops
because the surface on which it rolls resists its motion
.
Could a bee fly fast enough to crash into and stop a moving bowling ball?
True or False: A bee flying at the speed of sound could stop a 10-lb. bowling ball rolling slowly? (Answer: True. It could stop a bowling ball rolling up to 10 mph.)
What stays the same when a rolling pool ball stops upon hitting another ball at rest?
In this way,
momentum
is conserved, so that for any amount of momentum that Ball 2 gains, Ball 1 loses. That’s just Newton’s third law. Since they have the same mass, Ball 1 will decelerate at the same rate Ball 2 accelerates.
When two billiard balls collide which is always conserved?
When two objects collide, they interact during the collision and the elastic forces that arise upon contact of the two objects with each other provide the change in object’s velocity and/or direction of motion. However,
total momentum and masses of two objects
are usually conserved in collisions.
What force act upon a falling object?
Falling objects
The weight of the object – this is a force acting downwards, caused by the Earth’s
gravitational field
acting on the object’s mass . Air resistance – this is a frictional force acting in the opposite direction to the movement of the object.
What do all forces have in common?
All forces have two properties:
direction and magnitude
. A newton (N) is the unit used to describe the magnitude, or size, of a force. What two properties do all forces have? All forces act on objects.
