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Which graph represents an object moving with a constant positive velocity? A ) 1 C) 3 B) 2 D) 4. Which graph represents an object moving with a constant positive velocity? A ) 1 C) 3 B) 2 D) 4. Which graph represents an object at rest A ) 1 C) 3 B) 2 D) 4.
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Which graph represents an object moving with a constant positive velocity? • A ) 1 C) 3 • B) 2 D) 4
Which graph represents an object moving with a constant positive velocity? • A ) 1 C) 3 • B) 2 D) 4
Which graph represents an object at rest • A ) 1 C) 3 • B) 2 D) 4
Which graph represents an object at rest • A ) 1 C) 3 • B) 2 D) 4
Where is the squirrel at time t = 3.0 s? • A. 6.0m behind you • B. 2.0 m behind you C.0.8 m in front of you • D. 2.0 m in front of you
Where is the squirrel at time t = 3.0 s? • A. 6.0m behind you • B. 2.0 m behind you C.0.8 m in front of you • D. 2.0 m in front of you
What is the squirrel’s average velocity during the time interval between 0.0 s and 3.0 s? • F. –2.0 m/s • G. –0.67 m/s • H. 0.0 m/s • J. +0.53 m/s
What is the squirrel’s average velocity during the time interval between 0.0 s and 3.0 s? • F. –2.0 m/s • G. –0.67 m/s • H. 0.0 m/s • J. +0.53 m/s
On May 29, 1988, Rick Mears won the Indianapolis 500 in 3.45 hours. What was his average speed during the 500 mile race? • 862500 mph • 145 mph • 503.45 mph • 456 mph
On May 29, 1988, Rick Mears won the Indianapolis 500 in 3.45 hours. What was his average speed during the 500 mile race? • 862500 mph • 145 mph • 503.45 mph • 456 mph
The slowest animal ever discovered was a crab found in the Red Sea. It traveled with an average speed of 5.70 km/yr. How long would it take this crab to travel 100.0 km? • 570 years • .057 years • 17.5 years • 105.7 years
The slowest animal ever discovered was a crab found in the Red Sea. It traveled with an average speed of 5.70 km/yr. How long would it take this crab to travel 100.0 km? • 570 years • .057 years • 17.5 years • 105.7 years
Darren watches a thunderstorm from his apartment window. He sees the flash of a lightning bolt and begins counting the seconds until he hears the clap of thunder 10.0 s later. Assume the speed of sound in air is 340.0 m/s. How far away was the lightning bolt in meters? • A) 3400 m • B) 34 m • C) .029m • D) 350 m
Darren watches a thunderstorm from his apartment window. He sees the flash of a lightning bolt and begins counting the seconds until he hears the clap of thunder 10.0 s later. Assume the speed of sound in air is 340.0 m/s. How far away was the lightning bolt in meters? • A) 3400 m • B) 34 m • C) .029m • D) 350 m
What is the speed of a truck that travels 10.0 km in 10.0 minutes? • A) 1 km/hr • B) 60 km/hr • C) 6 km/hr • D) 20 km/hr
What is the speed of a truck that travels 10.0 km in 10.0 minutes? • A) 1 km/hr • B) 60 km/hr • C) 6 km/hr • D) 20 km/hr
What must be your average speed in order to travel 210 kilometers in 1.5 h ? • A) 140 km/hr • B) 315 km/hr • C) 70 km/hr • D) 211.5 km/hr
What must be your average speed in order to travel 210 kilometers in 1.5 h ? • A) 140 km/hr • B) 315 km/hr • C) 70 km/hr • D) 211.5 km/hr
If the average speed of a car is 50 km/h, and it travels for 90 minutes, what is the distance travelled? • A) 75 km • B) .56 km • C) 450 km • D) 140 km
If the average speed of a car is 50 km/h, and it travels for 90 minutes, what is the distance travelled? • A) 75 km • B) .56 km • C) 450 km • D) 140 km
The Sears Tower in Chicago is 443 m tall. Joe wants to set the world’s stair climbing record and runs all the way to the roof of the tower. If Joe’s average upward speed is 0.60 m/s, how long will it take Joe to climb from street level to the roof of the Sears Tower? • A) .00135 sec • B) 266 seconds • C) 760 seconds • D) 443.6 sec
The Sears Tower in Chicago is 443 m tall. Joe wants to set the world’s stair climbing record and runs all the way to the roof of the tower. If Joe’s average upward speed is 0.60 m/s, how long will it take Joe to climb from street level to the roof of the Sears Tower? • A) .00135 sec • B) 266 seconds • C) 760 seconds • D) 443.6 sec
An ostrich can run at speeds of up to 72 km/h. How long will it take an ostrich to run 1.5 km at this top speed? • A) 75 sec • B) 48 sec • C) 108 sec • D) 7 sec
When the car has traveled halfway around the track, what is the displacementfrom the starting point? • (a) r • (b) 2r • (c) πr • (d) zeor
When the car has traveled halfway around the track, what is the displacementfrom the starting point? • (a) r • (b) 2r • (c) πr • (d) zeor
When the car has traveled halfway around the track, how much distance did it cover? • (a) r • (b) 2r • (c) πr • (d) zeor
When the car has traveled halfway around the track, how much distance did it cover? • (a) r • (b) 2r • (c) πr • (d) zeor
An ostrich can run at speeds of up to 72 km/h. How long will it take an ostrich to run 1.5 km at this top speed? • A) 75 sec • B) 48 sec • C) 108 sec • D) 7 sec
Jupiter, the largest planet in the solar system, has an equatorial radius of about 7.1 104 km (more than 10 times that of Earth). Its period of rotation, however, is only 9 h, 50 min. That means that every point on Jupiter’s equator “goes around the planet” in that interval of time. Calculate the average speed (in m/s) of an equatorial point during one period of Jupiter’s rotation. • A) 4.1 * 103 m/s • B) 0 m/s • C) 1.3 * 107 km/s • D) 1.3 * 104 m/s
Jupiter, the largest planet in the solar system, has an equatorial radius of about 7.1 104 km (more than 10 times that of Earth). Its period of rotation, however, is only 9 h, 50 min. That means that every point on Jupiter’s equator “goes around the planet” in that interval of time. Calculate the average speed (in m/s) of an equatorial point during one period of Jupiter’s rotation. • A) 4.1 * 103 m/s • B) 0 m/s • C) 1.3 * 107 km/s • D) 1.3 * 104 m/s
The peregrine falcon is the fastest of flying birds (and, as a matter of fact, is the fastest living creature). A falcon can fly 1.73 km downward in 25 s. What is the average velocity of a peregrine falcon? • A) .07 km/hr • B) 43.25 km/hr • C) 250 km/hr • D) 4.15 km/hr
The peregrine falcon is the fastest of flying birds (and, as a matter of fact, is the fastest living creature). A falcon can fly 1.73 km downward in 25 s. What is the average velocity of a peregrine falcon? • A) .07 km/hr • B) 43.25 km/hr • C) 250 km/hr • D) 4.15 km/hr
The black mamba is one of the world’s most poisonous snakes, and with a maximum speed of 18.0 km/h, it is also the fastest. Suppose a mamba waiting in a hide-out sees prey and begins slithering toward it with a velocity of +18.0 km/h. After 2.50 s, the mamba realizes that its prey can move faster than it can. The snake then turns around and slowly returns to its hide-out in 12.0 s. Calculate the mamba’s average velocity during its return to the hideout. • A) 7.2 m/s • B ) 1.04 m/s • C) .67 m/s • D) 0 m/s
The black mamba is one of the world’s most poisonous snakes, and with a maximum speed of 18.0 km/h, it is also the fastest. Suppose a mamba waiting in a hide-out sees prey and begins slithering toward it with a velocity of +18.0 km/h. After 2.50 s, the mamba realizes that its prey can move faster than it can. The snake then turns around and slowly returns to its hide-out in 12.0 s. Calculate the mamba’s average velocity during its return to the hideout. • A) 7.2 m/s • B ) 1.04 m/s • C) .67 m/s • D) 0 m/s
The black mamba is one of the world’s most poisonous snakes, and with a maximum speed of 18.0 km/h, it is also the fastest. Suppose a mamba waiting in a hide-out sees prey and begins slithering toward it with a velocity of +18.0 km/h. After 2.50 s, the mamba realizes that its prey can move faster than it can. The snake then turns around and slowly returns to its hide-out in 12.0 s. Calculate the mamba’s average velocity for the complete trip. • A) 7.2 m/s • B ) 1.04 m/s • C) .67 m/s • D) 0 m/s
The black mamba is one of the world’s most poisonous snakes, and with a maximum speed of 18.0 km/h, it is also the fastest. Suppose a mamba waiting in a hide-out sees prey and begins slithering toward it with a velocity of +18.0 km/h. After 2.50 s, the mamba realizes that its prey can move faster than it can. The snake then turns around and slowly returns to its hide-out in 12.0 s. Calculate the mamba’s average velocity for the complete trip. • A) 7.2 m/s • B ) 1.04 m/s • C) .67 m/s • D) 0 m/s
In the Netherlands, there is an annual ice-skating race called the “Tour of the Eleven Towns.” The total distance of the course is 2.00 102 km, and the record time for covering it is 5 h, 40 min, 37 s. Calculate the average speed of the record race. • A) 37 km/hr • B) 2112 km/hr • C) .62 km/hr • D) 35.2 km/hr
In the Netherlands, there is an annual ice-skating race called the “Tour of the Eleven Towns.” The total distance of the course is 2.00 102 km, and the record time for covering it is 5 h, 40 min, 37 s. Calculate the average speed of the record race. • A) 37 km/hr • B) 2112 km/hr • C) .62 km/hr • D) 35.2 km/hr
What is the average speed in meters/second of a commercial jet that travels from New York to Los Angeles (4800 km) in 6.00 hours? • 1333 m/s • 11520000 m/s • 1.333 m/s • 80000 m/s
What is the average speed in meters/second of a commercial jet that travels from New York to Los Angeles (4800 km) in 6.00 hours? • 1333 m/s • 11520000 m/s • 1.333 m/s • 80000 m/s
Some new symbols • x = “horizontal position” • xf= “Final position” • xi = “initial position” • Δ = “Delta” means “change in” • Final value minus initial value
Displacement x = xf – xi displacement = final position – initial position • Displacement is a change in position. • The SI unit of displacement is the meter,m.
Displacement can be negative. • Just means you moved backwards
Another new symbols • v = velocity • Δx/t • How far did it go? • Divided by • How long did it take to get there?
One more new symbol • a =“Acceleration” • Speeding up or slowing down. • a=Δv/t • How much did it speed up or slow down per second. • Acceleration is positive if we speed up, negative if we slow down.
Units • Δx is in meters. • v is in m/s • a is in or