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SIMPLE MOTION
PHYS. VOCAB.and Units
APPLICATIONS
CALCULATIONS
MISCELLANEOUS
100
What is To calculate the average speed, you must a) add distance and time b) subtract the total amount of distance and by the total amount of time c) add speed plus direction d) divide the total amount of distance by the total amount of time
d) divide the total amount of distance by the total amount of time
100
What is A place or object used for comparison to determine if an object is in motion is called a) reference point b) constant speed c) velocity d) distance
a) reference point
100
A plane needs to reach a velocity of 300 km/hr relative to the air in order to take off. If there is a wind blowing at 80 km/hr in the direction opposite to take off, what velocity must the plane reach relative to ground in order to take off?
220 km/hr
100
A particle is moving in a straight line with a velocity given by 5t^2, where t is time. Find an expression for the acceleration of the particle.
10t
100
Show a velocity-time graph of a car moving in reverse, starting with a higher magnitude velocity and then decelerating at a constant rate until the car stops.
The first person to buzz draws the graph on the whiteboard.
200
What would the displacement-time graph of no motion look like? a) a horizontal line b) the slope of the line increasing steadily c) the slope of the line decreasing steadily d) the line of the graph would increase and decrease.
a) a horizontal line
200
What is the SI unit for acceleration?
m/s^2
200
When air resistance is factored in, why does an object with greater mass achieve a higher terminal velocity than an object with less mass when dropped from a very high altitude? hint: terminal velocity is reached when the air resistance matches the force of gravity.
Since a greater mass corresponds to a greater force of gravity, the air resistance must be greater on the more massive object before the terminal velocity is reached. The more massive object falls a greater distance before air resistance matches the gravitational force, resulting in a higher terminal velocity.
200
A car accelerates uniformly in a straight line from 10 m/s to 20 m/s in 5 seconds. What is the acceleration?
2 m/s^2
200
A high school student is driving to school. With the start of school being only minutes away, he is unfortunately following a slow garbage truck. The truck finally turns down a side street and the student accelerates to a much more customary speed. Sketch a reasonable velocity-time graph.
Sketch the graph on the whiteboard.
300
What is What does acceleration, deceleration, and cruise control look like on a velocity-time graph? a) a horizontal line b) the slope of the line would increase. It would be a straight line. c) The slope of the line would decrease. d) The slope of the line would increase, decrease, and then become horizontal.
d
300
Why is it possible to have zero velocity and yet have a non-zero value for speed?
If the displacement is zero, and the distance traveled is not zero, this means that an object returned to its starting point, but the object moved in a path leading to its return to the starting point.
300
Can a penny dropped from the Empire State Building kill a pedestrian below? Why or why not? You must discuss your answer using physics terms.
No, definitely not. First the mass of a penny is quite small, but that isn't the main reason. A penny tumbles in the air quite a bit as it falls, increasing the air resistance. Before long the air resistance resisting the gravitational pull causes a penny to reach its terminal velocity. The penny's velocity isn't high enough to contribute to a high magnitude force.
300
Julia and Aditi are playing miniature golf. Julia's ball rolls into a long. straight upward incline with a speed of 2.95 m/s and accelerates at -0.876 m/s/s for 1.54 seconds until it reaches the top of the incline and then continues along an elevated section. Determine the length of the incline.
3.5 m
300
What is A linear plot on a velocity/time graph shows ________ acceleration
constant
400
What is A car went 40 miles east, 30 miles south in 2 hours. What is the velocity of the car? a) 35 mi/hour b) 20 miles/hour c) 50 miles/hour d) none of the above
d) none of the above
400
A cannonball is launched horizontally from a cannon perched on the edge of a clifftop. Why is the horizontal acceleration zero?
Only the vertical force of gravity acts on the cannonball.
400
Describe the best strategy (include vertical velocity and horizontal velocity) to maximize the horizontal distance of a long jump and explain why the strategy works.
A champion long jumper attains the highest horizontal velocity possible by accelerating as quickly as possible because the greater the horizontal velocity, the greater the horizontal distance. The long jumper must push off the ground with the maximum force to attain a greater initial vertical velocity which will lengthen the time traveled.
400
During his recent skydiving adventure, Bala had reached a terminal speed of 10.4 m/s as he approached the ground with his parachute. During an attempt to snap one last photo with his camera, Bala fumbled it from a height of 52.1 m above the ground.Determine the speed with which the camera hits the ground.
33.6 m/s
400
Will a helium filled football kicked with the same force as an air filled football travel (a) more distance horizontally (b) less distance horizontally (c) about the same distance horizontally
c - answers will vary
500
Determine the displacement of an object which is moving at 10 m/s, then accelerates at a rate of 2.0 m/s^2 for 15 seconds.
375 m
500
Approximately what percentage of the hang time (in basketball) is spent in the top part of the jump? Explain!
about 50% - see diagram on whiteboard.
500
What is the difference in the velocity-time graphs for an optimal 100 m race and an optimal 400 m race.
The first one who buzzes must go to the whiteboard and sketch the graphs and explain why the graphs make sense.
500
Molly and Ava are riding around the neighborhood on their scooters. Ava is at rest when Molly passes her moving at a constant speed of 0.37 m/s. After 1.8 seconds, Ava decides to chase after Molly, accelerating at 0.91 m/s/s. How much time must Hayden accelerate before she is side-by-side with Molly?
1.68 seconds
500
Focus one one of the kinematics equations on the board. Use the shortcut that only Hamed was able to derive to show how another equation can be derived from the first equation.
Answers will vary.