High-Speed Elevator
The Rocket Launch
Roller Coaster Loop
Charging Station
Mag-Lev
100
A 100-story building elevator accelerating from rest to a constant cruise. The most appropriate metric unit for the height of the building and the mass of the elevator.
What are Meters and Kilograms?
100
A 50 kg weather rocket launching vertically.
This vector represents the vector sum of thrust, gravity, and air resistance.
(What is the Net Force?)
100
A frictionless car starting from rest at Point A (height $h$) entering a loop at Point B.
This type of energy is at its maximum when the car is at the highest point of the track.
What is Gravitational Potential Energy (PE_g)?
100
The equivalent resistance of two 10 Ohm resistors wired in parallel.
(What is 5 Ohm?)
100
Magnetic field lines are always drawn exiting this pole and entering the opposite pole.
What is the North Pole?
200
A 100-story building elevator accelerating from rest to a constant cruise.
On a velocity-time graph, this is the physical quantity represented by the slope of the line during the first 4 seconds.
What is Acceleration?
200
A 50 kg weather rocket launching vertically.
According to Newton’s 2nd Law, if fuel is burned (decreasing mass) while thrust remains constant, this happens to acceleration.
What is Increase?
200
If the track is not frictionless, some mechanical energy is converted into Q, which stands for this.
What is Internal (Thermal) Energy?
200
This device must be connected in series to measure the current flowing through a resistor.
(What is an Ammeter?)
200
Using the Right-Hand Rule, if a proton moves right through a field pointing into the page, the force is directed here.
What is Upward (toward the top of the page)?
300
A 100-story building elevator accelerating from rest to a constant cruise.
If an elevator cruises at 5 m/s for 10 seconds, this is the total vertical displacement.
What is 50 m?
300
[DAILY DOUBLE] The weight of a 50 kg rocket on Earth.
(What is 491 N?)
300
This is the shape of a graph that represents Kinetic Energy (KE) on the y-axis vs. Velocity (v) on the x-axis.
What is a Parabola (or J-curve)?
300
Adding an extra branch to a parallel circuit causes the total current drawn from the source to do this.
What is Increase?
300
This phenomenon describes a change in magnetic flux creating a potential difference in a nearby conductor.
What is Electromagnetic Induction?
400
If the elevator travels 200 m up and 200 m back down, this is the magnitude of its total displacement.
What is 0 meters?
400
As the rocket pushes exhaust gases downward, the gases push the rocket upward; this pair of forces is an example of this Law.
What is Newton’s 3rd Law (Action-Reaction)?
400
A 1000 kg car starts from rest at a height of 20 m. This is its velocity at the bottom of the hill (g=9.81 m/s^2).
What is 19.8 m/s?
400
A 120 V source is connected to a circuit with an equivalent resistance of 30 Ohm. This is the total current.
What is 4 Amperes?
400
To increase the strength of the levitation force from an electromagnet, you should increase the number of coils or this.
What is Current?
500
An elevator starts from rest and accelerates at 2.0 m/s^2 for 3.0 seconds, then cruises at constant speed for 4.0 seconds. This is the total distance traveled during the entire 7.0-second interval.
What is 33 meters?
Logic: d_1 = (1/2)at^2 = (1/2)(2)(3^2) = 9 m. Cruising speed v = at = 6 m/s. d_2 = vt = 6(4) = 24 m. Total = 33 m.
500
A 50 kg rocket is launched with a constant upward thrust of 600 Newtons. Taking gravity (g = 9.81 m/s^2) into account, this is the magnitude of the rocket’s upward acceleration.
What is 2.19 m/s^2?
Logic: F_g = mg = 490.5\text{ N}. F_{net} = 600 - 490.5 = 109.5 N.
a = F_{net}/m = 109.5 / 50 = 2.19 m/s^2.
500
A 1000 kg car is at the top of a 30 meter hill. If it reaches the bottom with a speed of 20 m/s, this is the amount of work done by friction (Q).
What is 94,300 Joules? (Accept approx 9.4 x 10^4 J
Logic: PE_total = mgh = 294,300 J. KE_{actual} = 1/2mv^2 = 200,000 J. The difference is Q.
Charging Station (Electricity) - 500
500
"A 120-volt electric motor does 2,400 Joules of work in 10 seconds. This is the amount of current flowing through the motor."
What is 2 Amperes?