I am speed (or velocity)
What is the difference between Speed and Velocity
Speed is a scalar (just a magnitude)
Velocity is a vector (direction and magnitude)
What unit is energy measured in?
Joules (J)
What is the formula for acceleration?
a = (vf- vi) / t
What is the formula for force?
F = ma
What animal is the town Mr. B is from best known for?
A Beaver
what are the formulas for speed and velocity
Speed: V=(d/t)
Velocity: V = (d/t) **Need arrows above V and T**
What are the formulas for potential and Kinetic Energy?
E(k) = 1/2mv^2
E(p) = mgh
What are the units for acceleration?
m/s^2
What is the formula for work?
W = Fd
What sport does Mr. B Coach?
Basketball
A car with an average speed of 120km/h is making the trip from Edmonton to Calgary in two and a half hours. How far apart are the two cities?
v = d/t → d = vt
d = (120km/h)(2.5h)
d = 300 km
what is the mass of a plane if at 10km altitude, it has 7.8x10^9 J of potential energy?
E(p)= mgh → m = E(p)/gh
m = 7.8x109J/(9.81m/s^2 x 10,000m)
m = 8.0 x 10^4kg
As youre walking to science class, you realize that you're late and start running. You go from 0.90M/S [E] to 4.1M/S [E] in 3.5 S. What is your acceleration?
a = (vf- vi) / t
a = (4.1m/s - 0.90m/s) / 3.5s
a = 0.91 m/s^2 [E]
What units are force and work measured in?
Force = Newtons (N) = kg X m/s^2
Work = Joules (J) = kg X (m^2/s^2)
How do you spell Mr. B's lastname?
BOISSONNAULT
Connor Mcdavid takes a slapshot, but misses the net and hits the boards. The puck initially travels at 42M/S [E] and takes 0.50S to hit the boards. It bounces back and travels 9.7M/S [W] for 1.6S. Determine the pucks distance travelled.
v = 42 m/s
d = ?
t = 0.50 s
v = 9.7 m/s
d = ?
t = 1.6 s
d = vt
d = (42m/s)(0.50s)
d = 21 m
d = vt
d = (9.7m/s)(1.6s)
d = 16 m
Total distance = 21m + 16m = 37m
What is the mass of a truck that has 90.0 KJ of E(k) while it is moving 15.0 M/S?
E(k) = 1⁄2mv^2 → m = 2E(k)/v^2
m = (2 x 90,000J) / (15.0m/s)^2
m = 800 kg
A cat pushes a plant off a shelf. Right before it hits the ground the plant has a velocity of of 7.9M/S [down]. If acceleration due to gravity is 9.81 M/S^2 [down], how long does it take the plant to hit the ground?
a = (vf- vi) / t → t = (vf- vi / a)
t = (-7.9m/s - 0m/s) / -9.81m/s2
t = 0.81 s
You use a force of 70 N to push a 20kg box to the right. what will the boxes acceleration be?
F = ma → a = F/m
a = 70N / 20kg
a = 3.5 m/s2[right]
What is Mr. B's favorite movie or song? (I'll accept either answer)
Movie = City of GOD
Song = Down to the Honkytonk
Connor Mcdavid takes a slapshot, but misses the net and hits the boards. The puck initially travels at 42M/S [E] and takes 0.50S to hit the boards. It bounces back and travels 9.7M/S [W] for 1.6S. Determine the pucks displacement.
(+21m) + (-16m) = 5.0 m [E]
Mechanical energy is E(m) = E(p) + E(k).
A 1.25 kg bird is flying at 8.00 M/S, 25.0 M above the ground. What is the birds mechanical energy?
E(m)= 1⁄2mv^2 + mgh
E(m)= 1⁄2(1.25kg)(8.00m/s)^2 + (1.25kg (9.81m/s^2)(25.0m)
E(m) = 347 J
A diver jumps right off a diving board and takes 1.5 S to reach the water. What is her velocity right before she hits the water?
a = (vf- vi) / t → vf = at + vi
vf = (-9.81m/s2(1.5s) + 0m/s
vf = -15 m/s → 15 m/s [down]
You use a force of 500N to push a truck, but it doesnt move. How much work is done?
W = Fd
W = (500N)(0m)
W = 0 J
When is Mr. B's Birthday?
December 15th, 2002