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PHYS 2001 Spring 2009 Working Kinematics Problems Graphical Kinematics A. Using the Slope B. Using the Area Under the Curve PHYS 2001 Spring 2009 CT1: A car travels in the negative direction. If the car speeds up, it’s acceleration must be...? A. Positive B. Negative

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slide1

PHYS 2001

Spring 2009

Working Kinematics Problems

Graphical Kinematics

A. Using the Slope

B. Using the Area Under the Curve

slide2

PHYS 2001

Spring 2009

CT1:

A car travels in the negative direction. If the car speeds up, it’s acceleration must be...?

A. Positive B. Negative

C. It cannot be determined

slide3

PHYS 2001

Spring 2009

EX1:

A fighter jet lands on a carrier traveling at 140 m/s. The tailhook and wire provide an acceleration to stop the jet whose magnitude is 70 m/s2. How long does it take the jet to stop?

slide4

PHYS 2001

Spring 2009

EX2:

Two cars approach each other on a straight stretch of highway. The first car is traveling East at 25 m/s and the second car is traveling West at 35 m/s.

(a) If the cars are initially 400 m apart, how long does it take for the cars to pass each other?

Two cars approach each other on a straight stretch of highway. The first car is traveling East at 25 m/s and the second car is traveling West at 35 m/s.

(b) How far have each of the cars traveled when they pass each other?

slide5

PHYS 2001

Spring 2009

EX3:

A hot air balloon takes off from the ground and accelerates straight up at 0.71 m/s2. After 5 seconds, the balloonist drops a sandbag overboard. How long does it take the sandbag to hit the ground?

slide6

PHYS 2001

Spring 2009

CT2:

Let up be the positive direction. When the sandbag is dropped, the velocity of the sandbag is...?

A. Positive B. Negative C. Zero

Let up be the positive direction. When the sandbag is dropped, the velocity of the balloon is...?

A. Positive B. Negative C. Zero

slide7

PHYS 2001

Spring 2009

EX3:

A hot air balloon takes off from the ground and accelerates straight up at 0.71 m/s2. After 5 seconds, the balloonist drops a sandbag overboard. How long does it take the sandbag to hit the ground?

slide8

PHYS 2001

Spring 2009

position (m)

time (s)

slide9

PHYS 2001

Spring 2009

velocity (m/s)

time (s)

slide10

PHYS 2001

Spring 2009

position (m)

time (s)

velocity (m/s)

time (s)

slide11

PHYS 2001

Spring 2009

A

B

C

D

E

F

CT3:

In what region is the object moving in the positive direction with a positive acceleration?

In what region is the object moving in the negative direction with a negative acceleration?

In what region is the object moving in the positive direction with a negative acceleration?

In what region is the object moving in the negative direction with a positive acceleration?

slide12

PHYS 2001

Spring 2009

2

velocity (m/s)

10

time (s)

30

60

80

slide13

PHYS 2001

Spring 2009

10

velocity (m/s)

-5

10

time (s)

20

30

40

50

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