Vocab
Let's Talk Motion
Calculations
Miscellaneous
Real World
100
Total path an object travels.
What is Distance?
100
3 m/s North is an example of what?
A velocity
100
A car travels 98 meters in 10 seconds. What is the cars speed?
9.8 m/s
100
What is the formula for finding speed?
Speed = Distance / Time
100
A baseball player moves their glove backwards when catching a fastball. Why does moving the glove backwards during the catch make it less painful?
Increasing the time over which the ball's velocity decreases causes less force!
200
Motion is the change in an objects what?
Position
200
Which car has the greatest acceleration?
Car A
200
A runner goes around a 1 mile track and ends up where he started what his is displacement?
Zero
200
A horizontal (flat) line on a velocity vs time graph shows ________ acceleration.
Zero
200
Two runners are competing in a 100 meter race. Runner A starts from a standing position and Runner B uses starting blocks. Both runners reach the same top speed. Who will win the Race? Why?
Runner B! By using starting blocks, more acceleration can be achieved quickly in the horizontal direction!
300
Final position - Initial Position.
What is Displacement?
300
Describe the motion of section A in this distance vs time graph.
Constant velocity
300
What is the velocity at 5 seconds?
6 m/s
300
What is the independent variable?
Time
300
Swimmers push off the wall and hold their bodies in a long, narrow position before beginning their strokes. Why don't they immediately start swimming with their arms?
Streamlined bodies allow for less water resistance, allowing more of their velocity from the push-off!
400
Acceleration is the change of __________ over time.
Velocity
400
What are all the ways an object can accelerate?
Speed up, Slow down or change direction
400
A car traveling at 20 m/s comes to a stop in 5 seconds. What is the acceleration?
-4 m/s2
400
Describe the motion of section A in this velocity vs time graph.
Slowing Down
400
You throw a ball straight up. At the exact moment the ball reaches its highest point, someone says "The ball isn't accelerating because it's not moving." Is the student correct? Explain.
No! While it's velocity is zero in that instantaneous moment, Gravity still causes an acceleration of 9.8 m/s2 down towards the ground!
500
The slope of a Velocity-Time Graph.
What is Acceleration?
500
Two people travel from Bismarck to Fargo, one by car at a velocity of 95 km/hr, and one by plane at a velocity of 275 km/hr. Can their displacements by equal? Explain.
Yes, their displacements are equal as long as both people travel the same distance in the same direction.
500
How long will it take an object traveling 25 m/s to reach a distance of 125 meters?
5 Seconds
500
In movies there are scenes where a horse and rider come to a fence; when the horse stops the rider flies over the horse's head. Explain why this happens.
Since you are riding the horse both the motion of the horse and yourself are the same. When the horse comes to a stop and you are not secured then you will fly off at the speed the horse was moving when it stopped. This all happens because of the momentum of the horse.
500
Two runners are traveling around a curved track at exactly the same speed. Can their velocities be different?
Yes! Velocity includes direction, and their direction can be different!