2D Kinematics

The vector's x component is calculated with trigonometry as

• x = magnitude + cos(angle)

• x = magnitude / cos(angle)

• x = magnitude * sin(angle)

• x = magnitude * cos(angle)

In a two dimensional flow, the component of the velocity along the X-axis is u = ax² + bxy + cy². If v = 0 at y = 0, what will be the velocity component in the Y-direction?

• v = 2axy + by²

• v = 2axy + by² ⁄ 2

• v = -2axy – b y² ⁄ 2

• v = -axy – b ⁄ 2 y²

SI unit of acceleration is-

• ms^-1

• ms^-2

• ms²

• none of these

What two measurements are necessary for calculating speed?

• Mass and time

• Temperature and mass

• Mass and distance

• Distance and time

Tags

NGSS.MS-PS3-1

A drag racer accelerated from 0 m/s to 200 m/s in 5 s.  What was the acceleration?

• 0 m/s

• 40 m/s²

• -40 m/s²

• 40 m/s

Tags

NGSS.MS-PS2-2

A cannonball is fired with an initial velocity of 100. meters per second at an angle of 15.0° above the horizontal. What are the horizontal (v_x) and vertical (v_y) components of this velocity?

• 25.9 m/s

• 99.6 m/s

• 76.0 m/s

• 65.0 m/s

A roller coasters accelerates from an initial velocity of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²

• 18 m/s²

• 16 m/s²

• 16 m/s

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds

• 35 seconds

• 0.3 seconds

• 3.3 seconds

Tags

NGSS.MS-PS2-2

A cannonball is fired with an initial velocity of 100. meters per second at an angle of 15.0° above the horizontal. What are the horizontal (v_x) and vertical (v_y) components of this velocity?

• 25.9 m/s

• 99.6 m/s

• 76.0 m/s

• 65.0 m/s

What is the speed of an object that travels 60 meters in 4 seconds?

• 240 m/s

• 15 m/s

• 0.067 m/s

• 15 mph

Tags

NGSS.MS-PS3-1