2D Kinematics

If two vectors are given such that A + B = 0, what can you say about the magnitude and direction of vectors A and B?

• same magnitude, but can be in any direction
• same magnitude, but must be in the same direction
• different magnitudes, but must be in the same direction
• same magnitude, but must be in opposite directions

Given that A + B = C, and that lAl² + lBl² = lCl² , how are vectors A and B oriented with respect to each other?

• they are perpendicular to each other
• they are parallel and in the same direction
• they are parallel but in the opposite direction
• they are at 45� to each other

Given that A + B = C, and that lAl + lBl = lCl , how are vectors A and B oriented with respect to each other?

• they are perpendicular to each other
• they are parallel and in the same direction
• they are parallel but in the opposite direction
• they are at 45� to each other

If each component of a vector is doubled, what happens to the angle of that vector?

• it doubles
• it increases, but by less than double
• it does not change
• it is reduced by half

A certain vector has x and y components that are equal in magnitude. Which of the following is a possible angle for this vector, in a standard x-y coordinate system?

• 30
• 180
• 90
• 45

You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude that you can obtain out of the following choices?

• 0
• 18
• 37
• 64

A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball?

• it depends on how fast the cart is moving
• it falls behind the cart
• it falls in front of the cart
• it falls right back into the cart

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

Now the cart is being pulled along a horizontal track by an external force (a weight hanging over the table edge) and accelerating. It fires a ball straight out of the cannon as it moves. After it is fired, what happens to the ball?

• it depends upon how much the track is tilted
• it falls behind the cart
• it falls in front of the cart
• it falls right back into the cart

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The same small cart is now rolling down an inclined track and accelerating. It fires a ball straight out of the cannon as it moves. After it is fired, what happens to the ball?

• it depends upon how much the track is tilted
• it falls behind the cart
• it falls in front of the cart
• it falls right back into the cart

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

You drop a package from a plane flying at constant speed in a straight line. Without air resistance, the package will:

• quickly lag behind the plane while falling
• remain vertically under the plane while falling
• move ahead of the plane while falling
• not fall at all

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4