Vectors & Scalars
Distance & Displacement
Average Velocity
Kinematic Formulas
Potpourri
Directions & Trig
100
How does a vector differ from a scalar?
A vector has both magnitude and direction, and a scalar has only magnitude.
100
Displacement refers to an object's overall change in.....
position
100
When you look at the speedometer in your car, does it show speed or velocity? (why?)
It shows SPEED because it only shows the magnitude (how many miles/hour) and not a direction
100
A plane lands with a velocity of 120 m/s and a deceleration of 6 m/s2. Find the time needed for the plane to come to a stop.
20 seconds
100
When an object starts "from rest", what equals zero?
initial velocity
100
Draw a plane on a heading of 60 degrees south of west
This is the same as 30 degrees west of south
200
A deer is running 15 m/s west. Is that a vector or a scalar?
Vector
200
A car moves 60 km east and then 90 km west. What is the distance traveled?
150 km
200
When you look at the speedometer in your car, what type of speed does it show, average or instantaneous?
Instantaneous
200
A plane lands with a velocity of 120 m/s and a deceleration of 6 m/s2.Can this plane land on a runway that's 0.8 km long?
Nope - it needs a runway at least 1.2 km long to land
200
When an object "comes to rest", what equals zero?
Final velocity
200
Draw a boat on a heading of 20 degrees east of north
This is the same as 70 degrees north of east
300
How do you combine vectors if they are in the same direction (example: 40 m north then 50 m north)
Add them
300
A car moves 60 km east and 90 km west. What is the displacement?
30 km west
300
If Luko rides south on his bike in a straight line for 15 minutes with an average speed of 12.5 km/hr, how far has he ridden?
3.1 km south
300
You're riding an elephant in the circus, and you accelerate from 0.5 m/s to 4 m/s in 11 seconds. How far did you travel in this time period?
24.75 m
300
What does a negative sign in physics often represent?
A direction
300
If x = 20 miles and R = 28 miles, what is y?
19.6 miles
400
How do you combine vectors if they are in opposite directions (example: 40 m north then 50 m south)
Subtract them
400
A car travels 90 meters north in 15 seconds. It then travels 40 meters south. What is the car's resultant displacement?
50 meters north
400
It takes you 9.5 seconds to walk with an average velocity of 1.2 m/s to the north from the bus stop to the stadium entrance. What is your displacement?
11.4 m north
400
You're riding your bike at 3 m/s when SQUIRREL! You brake and come to a stop in 1.2 m, just missing the squirrel. What was your deceleration?
-3.75 m/s2
400
What branch of mechanics are we currently studying? (hint: one word, starts with a k)
kinematics
400
If theta = 42 degrees and R = 600 m, find x, y, and the angle alpha.
x = 445.9 m
y = 401.5 m
alpha = 48 degrees
500
True or false: Speed is the magnitude of velocity
True
500
A boomerang is thrown 20 m in a straight line and returns exactly to the spot it was thrown. What is its displacement?
zero (there is no net change in position)
500
Just kidding, this is actually a kinematic formula question: The sharknado ride at the fair goes from rest to 30 m/s in 5 seconds. What is its acceleration?
6 m/s2
500
Jack (the pumpkin king) starts from rest and accelerates at 3.9 m/s2 for 7.8 m before reaching the mayor and scaring him. How long does it take Jack to reach the mayor?
2 seconds
500
What is the acceleration of an otter moving at a constant speed of 2.3 m/s?
Zero - the otter is not accelerating (constant speed)
500
If alpha = 25 degrees and y = 15 cm, find theta, x, and R
Theta = 65 degrees
x = 7 cm
R = 16.6 cm