PHYSICS 10 Lecture Notes - Lecture 2: Concrete Masonry Unit, Thought Experiment, Laziness

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9 Apr 2017

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Physics 10 lecture notes week 1 day 2. If score is 50%-100%, get 100% credit in gradebook. At the highest point, v=0 v = v0 - gt. 0 = 0 + 5t - (10)t2 t = 0,1. Plugging in dimensions serves as another way to check if things are making sense. Airplane moves north with speed of 300 km/hr. The trajectory is the sum of the 2 vectors. Y-axis: y = y0 + v0t + at2. X-axis: x = x0 + vt v0x = 5m /s v0y = 5m/s. How far away will the ball hit the ground? y = v0yt - gt2. 0 = v0y - gt t = 2v0y/g. At same time x = v0xt = v0x (2v0y/g) = 5m. Deals with why objects are moving/not moving. Marble on top of card on top of bottle. Everything stays on table when cloth is pulled away. In absence of external forces, objects will keep doing what it"s doing.

Related Questions

the acceleration of a marble in a certain fluid is proportional tothe speed of the marble squared given by a=av^2 where v>0 m/sand a=-2.15m^-1, if the marble enters this fluid with a speed of2.1 m/s, how long will it take before the marble's speed is reducedto half of 16s initial value?

a=a*v^2

dv/dt=a*v^2

v0=2.1m/2 (t=0)

Vt(t=?)=V0/2

dv/dt=-2.15

dv=-2.15v^2dt

A ball is kicked from a location < 9, 0, -6 > (on the ground)with initial velocity < -10, 17, -3 > m/s. The ball's speedis low enough that air resistance is negligible.

velocity of the ball = <-10, 14,06, -3>

What is the average velocity of the ball over this timeinterval?

Use the average velocity to find the location of the ball 0.3seconds after being kicked:

Now consider a different time interval: the interval between theinitial kick and the moment when the ball reaches its highestpoint. We want to find how long it takes for the ball to reach thispoint, and how high the ball goes.

What is the y-component of the ball's velocity at the instant whenthe ball reaches its highest point (the end of this timeinterval)?

Fill in the missing numbers in the equation below (update form ofthe Momentum Principle):
mvyf = mvyi + Fnet,y?t
m( ) = m( )+ -mg?t

How long does it take for the ball to reach its highestpoint?
?t = ( ) s.
Knowing this time, first find the y-component of the averagevelocity during this time interval, then use it to find the maximumheight attained by the ball:
ymax = ( ) m.

1. A block is placed on a plane whose angle of inclination is 30˚. The coefficients of static and kinetic friction for the block on the inclined plane are both 0.2. The block
(A) remains stationary on the inclined plane.
(B) accelerates down the inclined plane.
(C) travels down the inclined plane at a constant velocity.
(D) travels up the inclined plane at a constant velocity.
(E) accelerates up the inclined plane.

2. An object with a mass of 5.5 kg is allowed to slide from rest down an inclined plane. The plane makes an angle of 30˚ with the horizontal and is 72 m long. The coefficient of friction between the plane and the object is 0.35. The speed of the object at the bottom of the plane is?

3. A 5-kg object slides down a frictionless surface inclined at an angle of 30˚ from the horizontal. The total distance moved by the object along the plane is 10 meters. The work done on the object by the normal force of the surface is?

4. A mass m = 2.5 kg is sliding along a frictionless table with initial speed v as shown in the figure. It strikes a coiled spring that has a force constant k = 500 N/m and
compresses it a distance x=5.0 cm. The initial speed v of the block was..?

5. The graph shows how the position of a particle depends on time. Which choice is closest to the instantaneous speed of the particle at t = 3s?
(A) 0.40 m/s
(B) 0.67 m/s
(C) 0.75 m/s
(D) 1.50 m/s
(E) 2.22 m/s

6. Calculate the work done by a force, F = 2x i, along the
path (0, 0) -> P₁(2, 0) -> P2(2, 2).

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PHYSICS 10 Lecture Notes - Lecture 2: Concrete Masonry Unit, Thought Experiment, Laziness

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