Definitions
a quantitiy that is defined by magnitude only?
What is scalar
Draw a position vs time graph of a person who is not moving
look to board.
A man walks 50m north and then turns around and walks 30m south. What is his displacement?
What is 20m north?
On a ride called the Detonator at Worlds of Fun in Kansas City, passengers accelerate straight downward from 0 to 45 mi/hr in 2.2 seconds. What is the average acceleration of the passengers on the ride?
what is -20.45 mi/hr/s
A ball is thrown straight up with a velocity of 16 m/s; what will be its velocity 2.0s after being released?
what is -3.6 m/s
Magnitude and Direction
What is a vector
Draw a velocity vs time that shows a constant velocity
look to board.
A man walks 50m in 10s, what is his velocity?
What is 5m/s?
An object initially at rest experiences an acceleration of 9.8 m/s2. How much time will it take it to achieve a velocity of 58 m/s?
what is 5.92 Secs
A stone is thrown down off a bridge with a velocity of 5.6 m/s. What is its velocity after 3 seconds have passed?
what is -35 m/s
Vector qunaitity that refers to overall cnage in objects position
What is displacement?
Draw a position vs time graph of a person who is moving at a constant velocity
look to board
A car accelerates from 40m/s to 50m/s in 5 seconds. What is his acceleration?
What is 2m/s2?
An object travels at a constant velocity of 15 m/s when it experiences a constant acceleration of 3.5 m/s2 for a time of 11 s. What will its velocity be after that acceleration?
what is 53.5 M/S
Standing at the edge of a cliff 32.5m high, you drop a ball. Later, you throw a second ball downward with an initial speed of 11 m/s. Calculate the velocity of each of the balls when it hits the ground
What is -25.24 m/s and -27.53 m/s
An object that is being acted upon only by the force of gravity
What is free fall?
Draw a velocity vs time graph of an object that is decelerating
board
A woman walks 500m in 6 min. What is her speed in m/s?
What is 1.3m/s
You are driving through town at 12 m/s when suddenly a BABY rolls out in front of you. You apply the brakes and begin decelerating at 3.5 m/s2. How far do you travel before stopping?
what is 20.57 M
An arrow is launched straight up from the ground with an initial velocity of 23.4 m/s. How long until it reaches its highest point?
what is 2.39 seconds
Designated by a positive or negative sin on a vector quantity
What is direction?
Draw a position vs time graph for an object that is accelerating
look to board
A car drives 600 miles in 6 hours. What is the speed in m/s? (0.6 miles in 1km)
What is 46.29m/s
At the scene of an accident, a police officer notices that the skid marks of a car are 10m long. The officer knows that the typical deceleration of a car when skidding is 45 m/s2. What can the officer estimate for the original speed of the car?
what is 30 m/s
Michael Jordan’s vertical leap is reported to be 48 inches (1.22m). What is his take off speed?
what is 4.89 m/s