Motion and Vectors

For an object tossed straight up into the air, the velocity at the top of trajectory is

• a. Zero

• b. V_x

• c. V_y

• d. -9.8m/s²

If the object is thrown at an angle of 30^o to the horizontal, the velocity at the top of the trajectory is

• a. Zero

• b. V_0x

• c. V_0y

• d. -9.8m/s²

What direction is acceleration in projectile motion?

• a. Left

• b. Right

• c. Up

• d. Down

Tags

NGSS.HS-PS2-1

Which would hit the ground faster in the absence of air resistance, a feather or a bowling ball?

• a. The feather

• b. The bowling ball

• c. They both hit the ground at the same time

• d. they are suspend in the air

Tags

NGSS.HS-PS2-4

When velocity is negative and acceleration is negative, what happens to the object's motion?

• a. The object slows down

• b. The object speeds up

• c. Nothing happens to the object

• d. The object remains at rest

Tags

NGSS.HS-PS2-1

What type of movement is the result of an acceleration?

• a. Speeding up

• b. Slowing down

• c. Changing direction

• d. all of the above

Tags

NGSS.HS-PS2-1

A bird is traveling 10m/s west encounters a strong wind is traveling 6 m/s north. What is the magnitude of the bird's resultant velocity?

• a. 4.1 m/s

• b. 16.3 m/s

• c. 11.7 m/s

• d. 10.7 m/s

Vector A has a magnitude of 30 units. Vector B is perpendicular to Vector A and has a magnitude of 40 units. What would the magnitude of the resultant vector A+B be ?

• A.10 units

• B. 50 units

• C. 70 units

• D. zero

What term represents the magnitude of a velocity vector?

• A. acceleration

• B. momentum

• C. speed

• D. velocity

What is the direction of the resultant vector A+B?

• A. 15^o above the x-axis

• B. 75^o above the x-axis

• C. 15^o below the x-axis

• D. 75^o below x-axis