Why can motion seem different to different observers?
to a person who is standing still and a car is passing by it seems to go by fast , someone in the car moving at the same speed as a car may not notice the motion
________represensts motion and direction
velocity
In a swimming race, Miho swam the first 50 m in 52 s. She swam the second 50 m in 40 s. What was Miho’s average speed during the race?
52 s for 50m = 0.98m/s
40 s for 50m = 1.19m/s
0.98 + 1.19s = 2.17 divided by 2 =1.03m/s. for 50m = average speed.
If a car travels 60km in one hour, what is its average speed?
60 km/h
If I travel 50 kilometers per hour, how far will I go in 2 hours?
What is 2 hours to travel 100 kilometers ( use the formula)
What is a stationary object such as a tree a street sign or a line on the road
What is refernce point.
An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator?
he direction the elevator traveled
What information does the graph give you about the speed of the metal ball over time?
The speed of the ball increases over time
graphing motion can be used to show?
The steeper the slope, the faster it goes.
An athlete is running a 5-km race at an average speed of 8 km/h. She has to stop to tie her shoe. After tying her shoe, she continues running at 8 km/h. Why would her average speed for the entire race be less than 8 km/h?
The total time she took to complete the race increased because she stopped.
What is the speed formula?
speed equal distance over time
m/s/s or m/s 2
acceleration is stared in
A car travels in a straight line. The driver applies the brakes and comes to an abrupt stop. During braking, what happens to the velocity and acceleration vectors?
They point in opposite directions.
T or F A car maintains a constant speed while driving straight ahead. (This is an example of acceleration?)
False.
What is the average acceleration of the car?
5 m/s2
What are the SI units for acceleration?
m/s2
A bus moves on a straight road and then makes a right turn. (T or F) This is acceleration.
True