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• 11th Grade Physics Workbook METU Development Foundation High School 1

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• 11th Grade Chapter-1 Relative Motion Activity - 1.2.1 Moving observer

11th Grade Physics Workbook METU Development Foundation High School 9

1.2 - RELATIVE MOTION Activity 1.2.1

Moving observer 1.

Velocity of the motorcycle with respect to ground is vmotor=10 m/s due 60

0 north of east and velocity of the car with respect to ground is vcar=5 m/s due east. What is the velocity of the car with respect to the motorcycle in m/s? 2.

The velocities of a car and a truck with respect to ground are given as in the figure. What is the velocity of the car with respect to the truck?

3.

Cars A, B, C, and D move toward a cross-section at equal speeds. Which car is the fastest with respect to the driver of the car A? 4. A car travels at a constant velocity of 8 m/s due east. The driver of the car observes a truck and sees the truck as it moves in a direction of 37 north of west at 10 m/s. What is the velocity of the truck relative to the ground?

11th Grade Physics Workbook METU Development Foundation High School 9

1.2 - RELATIVE MOTION Activity 1.2.1

Moving observer 1.

Velocity of the motorcycle with respect to ground is vmotor=10 m/s due 60

0 north of east and velocity of the car with respect to ground is vcar=5 m/s due east. What is the velocity of the car with respect to the motorcycle in m/s? 2.

The velocities of a car and a truck with respect to ground are given as in the figure. What is the velocity of the car with respect to the truck?

3.

Cars A, B, C, and D move toward a cross-section at equal speeds. Which car is the fastest with respect to the driver of the car A? 4. A car travels at a constant velocity of 8 m/s due east. The driver of the car observes a truck and sees the truck as it moves in a direction of 37 north of west at 10 m/s. What is the velocity of the truck relative to the ground?

vcm=vc - vmvc

-vm

5 m/s

5 m/s

5 3 m/s

vcm=5 3 m/s

N

EW

S

vct=vc - vt

vct=10 m/s

(due east)60o

• 11th Grade Chapter-1 Relative Motion Activity - 1.2.1 Moving observer

11th Grade Physics Workbook METU Development Foundation High School 9

1.2 - RELATIVE MOTION Activity 1.2.1

Moving observer 1.

Velocity of the motorcycle with respect to ground is vmotor=10 m/s due 60

0 north of east and velocity of the car with respect to ground is vcar=5 m/s due east. What is the velocity of the car with respect to the motorcycle in m/s? 2.

The velocities of a car and a truck with respect to ground are given as in the figure. What is the velocity of the car with respect to the truck?

3.

Cars A, B, C, and D move toward a cross-section at equal speeds. Which car is the fastest with respect to the driver of the car A? 4. A car travels at a constant velocity of 8 m/s due east. The driver of the car observes a truck and sees the truck as it moves in a direction of 37 north of west at 10 m/s. What is the velocity of the truck relative to the ground?

11th Grade Physics Workbook METU Development Foundation High School 9

1.2 - RELATIVE MOTION Activity 1.2.1

Moving observer 1.

Velocity of the motorcycle with respect to ground is vmotor=10 m/s due 60

0 north of east and velocity of the car with respect to ground is vcar=5 m/s due east. What is the velocity of the car with respect to the motorcycle in m/s? 2.

The velocities of a car and a truck with respect to ground are given as in the figure. What is the velocity of the car with respect to the truck?

3.

Cars A, B, C, and D move toward a cross-section at equal speeds. Which car is the fastest with respect to the driver of the car A? 4. A car travels at a constant velocity of 8 m/s due east. The driver of the car observes a truck and sees the truck as it moves in a direction of 37 north of west at 10 m/s. What is the velocity of the truck relative to the ground?

When two vectors that have the same magnitude are added, their magnitude

increases as the angle between them decreases.

The angle between -vA and vC is the smallest then vCA is the greatest.

vtc=vt - vc

vc

8 m/s 8 m/s

N

EW

S

vt=vc + vtc

vtc

37o

6 m/s10 m/s

vt=6 m/s due north

• 11th Grade Chapter-1 Relative Motion Activity - 1.2.1 Moving observer

11th Grade Physics Workbook METU Development Foundation High School 10

5.

The velocity vectors of cars X, Y, Z and T with respect to ground are shown in the figure. Which cars driver observes the car T as it is moving due south? 6.

vK and vL are the velocities of cars K and L with respect to the ground and vKM is the velocity of car K with respect to car M. What is the velocity of L with respect to the M?

7.

Cars K, L and M are moving in the same direction with constant velocities. The driver of car K sees car L as moving toward east and the driver of car L sees car M as moving toward east. Which of the following relations between the speeds of the cars is/are possibly correct? I. vK > vL II. vL > vM III. vM > vK 8.

Two skiers, K and L, are moving at constant speeds of 9 m/s and 12 m/s respectively as shown in the figure. What is the velocity of skier K with respect to skier L?

11th Grade Physics Workbook METU Development Foundation High School 10

5.

The velocity vectors of cars X, Y, Z and T with respect to ground are shown in the figure. Which cars driver observes the car T as it is moving due south? 6.

vK and vL are the velocities of cars K and L with respect to the ground and vKM is the velocity of car K with respect to car M. What is the velocity of L with respect to the M?

7.

Cars K, L and M are moving in the same direction with constant velocities. The driver of car K sees car L as moving toward east and the driver of car L sees car M as moving toward east. Which of the following relations between the speeds of the cars is/are possibly correct? I. vK > vL II. vL > vM III. vM > vK 8.

Two skiers, K and L, are moving at constant speeds of 9 m/s and 12 m/s respectively as shown in the figure. What is the velocity of skier K with respect to skier L?

-vX

vT

vTX

The driver of car X observes car T as it is moving due south.

-vM

vLM

vKM

vK

-vM

vL

• 11th Grade Chapter-1 Relative Motion Activity - 1.2.1 Moving observer

11th Grade Physics Workbook METU Development Foundation High School 10

5.

The velocity vectors of cars X, Y, Z and T with respect to ground are shown in the figure. Which cars driver observes the car T as it is moving due south? 6.

vK and vL are the velocities of cars K and L with respect to the ground and vKM is the velocity of car K with respect to car M. What is the velocity of L with respect to the M?

7.

Cars K, L and M are moving in the same direction with constant velocities. The driver of car K sees car L as moving toward east and the driver of car L sees car M as moving toward east. Which of the following relations between the speeds of the cars is/are possibly correct? I. vK > vL II. vL > vM III. vM > vK 8.

Two skiers, K and L, are moving at constant speeds of 9 m/s and 12 m/s respectively as shown in the figure. What is the velocity of skier K with respect to skier L?

11th Grade Physics Workbook METU Development Foundation High School 10

5.

The velocity vectors of cars X, Y, Z and T with respect to ground are shown in the figure. Which cars driver observes the car T as it is moving due south? 6.

vK and vL are the velocities of cars K and L with respect to the ground and vKM is the velocity of car K with respect to car M. What is the velocity of L with respect to the M?

7.

Cars K, L and M are moving in the same direction with constant velocities. The driver of car K sees car L as moving toward east and the driver of car L sees car M as moving toward east. Which of the following relations between the speeds of the cars is/are possibly correct? I. vK > vL II. vL > vM III. vM > vK 8.

Two skiers, K and L, are moving at constant speeds of 9 m/s and 12 m/s respectively as shown in the figure. What is the velocity of skier K with respect to skier L?

If the driver of car K sees car L as moving due east then its speed must be smaller than the

speed of L.

If the driver of car L sees car M as moving due east then its speed must be smaller than the

speed of M.

vM > vL > vK

wrongwrongcorrect

vKL=vK -

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