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

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

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

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 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

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, 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

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 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

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

Which graph represents an object moving with a constant positive velocity? A ) 1 C) 3 B) 2 D) 4