Speed and Velocity
Speed and velocity share this standard unit.
What is m/s? (metres per second)
Acceleration has this standard unit.
What is m/s^2?
T/F: Falling would count as a type of uniform motion, if friction is ignored.
What is true?
Falling under the effect of just gravity
What is free fall? (projectile motion is also a good answer)
Speed at this exact moment
What is Instantaneous speed? Found by doing a tangent line on a d vs. t graph or a speedometer in real life
If a person walks 200 m east and 300 m south, it's their total distance.
What is 500 m?
A position vs. time graph with a positive slope would mean this.
What is constant positive velocity?
A motorbike accelerates at a constant rate until it's traveling 3.0 m/s after 1.1 seconds. This is the amount of ADDITIONAL time, it would take to reach 9 m/s.
What is 2.2 seconds? (vf - vo)/t = a and (vf - vo)/a = t. Find acceleration, then find time, then subtract 1.1 seconds)
If something accelerates at 0.500g forwards, this is the acceleration.
What is 4.91 m/s^2 forward?
What is kinematics? (aka, the chapter we just studied)
If a person runs 200 m east and 300 m south in 2 minutes, it's their speed.
What is 4.17 m/s?
It's the average acceleration of a truck that accelerates from 30.0 km/hr to 40.0 km/hr in 2.5 seconds.
What is 1.1 m/s^2? (forward acceleration, (delta v)/delta T))
This is the height of a cliff you'd need to fall off of to reach 200 km/hr.
Fun fact: Water won't save you at that height. Surface tension is proportional to velocity = you're hitting concrete.
This is delta d arrow/delta t.
What is average velocity?
If a person runs 200 m east and 300 m south in 2 minutes, it's their velocity.
What is 4.17 m/s 56.3 degrees S of E?
What's the acceleration of a bike that slows down from 5.0 m/s to 3.0 m/s in 2 seconds?
What is a = -1.0 m/s^2? (a = delta v/delta t)
If I drop an object off the Burj Khalifa (828 m), how long will it take to hit the ground?
What is 13 seconds? (d = vot + 0.5gt^2, d = 0.5gt^2)
This is the vector version of a location/distance.
What is position?
If the equation for a d vs. t graph is this: y = -3.5x, it's the velocity.
What is -3.5 m/s? (downward or backwards from the positive direction)
A car is driting down the driveway up to a speed of 1.5 m/s. The driver hits the gas which causes it to lurch forward hitting 3.0 m/s. If this process takes 3.0 seconds, this is the acceleration of the car.
What is 1.5 m/s^2? (a= (vf - vo)/t, down the driveway is negative in this scenario)
This is a scenario under which it's a good idea to treat acceleration under gravity as a positive value.
What is when you're solving for a velocity later in the fall or distance the object has fallen and you don't have an initial upward velocity?
This is the vector version of total distance.
What is displacement?