A puck has an elastic, glancing collision with the edge of an air hockey table.
In
[link] , a puck is shown colliding with the edge of an air hockey table at a glancing angle. During the collision, the edge of the table exerts a force
F on the puck, and the velocity of the puck changes as a result of the collision. The change in momentum is found by the equation:
As shown, the direction of the change in velocity is the same as the direction of the change in momentum, which in turn is in the same direction as the force exerted by the edge of the table.
Note that there is only a horizontal change in velocity. There is no difference in the vertical components of the initial and final velocity vectors; therefore, there is no vertical component to the change in velocity vector or the change in momentum vector. This is consistent with the fact that the force exerted by the edge of the table is purely in the horizontal direction.
Test prep for ap courses
A boy standing on a frictionless ice rink is initially at rest. He throws a snowball in the +
x -direction, and it travels on a ballistic trajectory, hitting the ground some distance away. Which of the following is true about the boy while he is in the act of throwing the snowball?
He feels an upward force to compensate for the downward trajectory of the snowball.
He feels a backward force exerted by the snowball he is throwing.
He feels no net force.
He feels a forward force, the same force that propels the snowball.
A 150-g baseball is initially moving 80 mi/h in the –
x -direction. After colliding with a baseball bat for 20 ms, the baseball moves 80 mi/h in the +
x -direction. What is the magnitude and direction of the average force exerted by the bat on the baseball?
Linear momentum (
momentum for brevity) is defined as the product of a system’s mass multiplied by its velocity.
In symbols, linear momentum
is defined to be
where
is the mass of the system and
is its velocity.
The SI unit for momentum is
.
Newton’s second law of motion in terms of momentum states that the net external force equals the change in momentum of a system divided by the time over which it changes.
In symbols, Newton’s second law of motion is defined to be
is the net external force,
is the change in momentum, and
is the change time.
Conceptual questions
An object that has a small mass and an object that has a large mass have the same momentum. Which object has the largest kinetic energy?
Football coaches advise players to block, hit, and tackle with their feet on the ground rather than by leaping through the air. Using the concepts of momentum, work, and energy, explain how a football player can be more effective with his feet on the ground.
(a) Calculate the momentum of a 2000-kg elephant charging a hunter at a speed of
. (b) Compare the elephant’s momentum with the momentum of a 0.0400-kg tranquilizer dart fired at a speed of
. (c) What is the momentum of the 90.0-kg hunter running at
after missing the elephant?
(a) What is the mass of a large ship that has a momentum of
, when the ship is moving at a speed of
(b) Compare the ship’s momentum to the momentum of a 1100-kg artillery shell fired at a speed of
.
(a) At what speed would a
airplane have to fly to have a momentum of
(the same as the ship’s momentum in the problem above)? (b) What is the plane’s momentum when it is taking off at a speed of
? (c) If the ship is an aircraft carrier that launches these airplanes with a catapult, discuss the implications of your answer to (b) as it relates to recoil effects of the catapult on the ship.
(a)
(b)
(c) Because the momentum of the airplane is 3 orders of magnitude smaller than of the ship, the ship will not recoil very much. The recoil would be
, which is probably not noticeable.
(a) What is the momentum of a garbage truck that is
and is moving at
? (b) At what speed would an 8.00-kg trash can have the same momentum as the truck?
A runaway train car that has a mass of 15,000 kg travels at a speed of
down a track. Compute the time required for a force of 1500 N to bring the car to rest.
Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you.
Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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