Vectors and uncertainties
Name three vector quantities that we have studied so far in this semester
Displacement, velocity, acceleration, forces, tension, weight, normal force, friction, momentum
A marble rolling on a table falls from the edge with horizontal velocity of 0.05 m/s2 . What is the initial vertical velocity of the marble when it starts to fall?
0 m/s
True or false: The normal force always (like, ALWAYS) has the same magnitude as the weight of a body.
False.
A 0.50 kg ball bounces vertically off a hard surface. Check the graph below. Find the magnitude of the momentum change during the bounce.
3.0 N s
What food stand is located to the left of La Flor de Córdoba at Universidad's Ciberplaza?
Gong Cha
What is the total angle of a vector that points 30° Southwest
210°
True or false: The time in air of a projectile is always the double of the time it takes for the projectile to reach maximum height.
False.
A force F1 = 680 N, 20° is added to another force F2 = 950 N, 90°. What is the vertical component of the addition of these forces?
Write on the board the procedure to rewrite Newton's 2nd Law F = ma in terms of momentum (F = Change in momentum / change in time).
You get points based on the procedure.
In this campus, there is a pollinator garden. Where is it located?
Next to the bus parking lot.
The mass of a wooden block is recorded as m = 250 g +- 5%. What is the absolute uncertainty in the mass of the block? (Express your answer with sig.fig. criteria).
+- 13 g
You throw a ball upwards with a velocity of 22 m/s. How much time will it take to travel a height of 8 m? Double your points if you find the two time marks the ball crosses the 8 m height.
First time: t = 0.39 s. Second time: t = 4.09 s
Read the problem on the screen. What is the value of the force of friction?
The magnitude of friction is 5263.16 N
Determine the minimum speed of the mass in the figure below at the initial point such that the mass stops at the top of the barrier of height h = 0.80 m.
3.96 m/s
When is the Pet's Day of the Dead celebrated?
October 27th
A force F = 50 N +- 4% accelerates a mss m = 10 kg +- 2%. What is the percentage uncertainty in the acceleration?
6%
A projectile is launched at a velocity of 16 m/s at 25° above the horizontal. What is the maximum height of the projectile? How long is the time in air of the projectile?
Max. height: 2.33 m. Time in air: 1.38 s
Read the problem on the screen. What is the value of the inclined force?
981 N
A 2 kg block is released from rest at the top of a frictionless 5 m high ramp. Taking g = 10 m/s2, what are its Total Mechanical Energy (ET) at the top and its Speed (v) at the bottom?
ET = 100 J, v = 10 m/s
Gambling time: The answer will reveal either "cat" or a "dog". Place your bet, if you get it right, you double your points. If you guess wrong, you lose your bet.
Dog
A quantity Y is given by Y = a b³ / √c. The percentage uncertainties in a, b, and c are 1%, 2%, and 4% respectively. What is the percentage uncertainty in Y?
A block of mass 4.2 kg is projected up an inclined plane with speed 14 m/s. The tilt of the plane is 28°. The coefficient of dynamic friction is 0.42, while the coefficient of static friction is 0.55.
After how much time will the block stop? What distance will the block cover?
Time to stop: 1.7 s, Distance covered: 12 m
A 5 kg sled is pulled horizontally across ice with a force of 25 N. If the friction force opposing the motion is 10 N, what is the acceleration of the sled? How far does the sled travel in 4 seconds if it starts from rest?
Acceleration: 3 m/s2 . Distance: 24 m.
A 2 kg block is dropped from rest from a height of 0.8 m above a vertical, uncompressed spring. When the block comes to a temporary stop, the spring is compressed by 0.2 m. Taking g = 10 m/s2, what is the spring constant k?
k = 500 N/m
What English word has three consecutive double letters?
Bookkeeper, Bookkeeping