Kinematics in Two Dimension

Which of the following is a vector quantity?

• 5 m/s

• 5m/s, east

• 5s

• none of these

Which statement describes a vector?

• It has magnitude but no direction

• It has both direction and magnitude

• It has direction but no magnitude

• It has constant magnitude but no direction

A sailboat is sailing 15 m/s due west is a

• vector quantity

• scalar quantity

• both

• none of these

A vector A 5m, east is added to vector B at 3m, west. What is the resultant?

• 8 m, east

• 2m, east

• 2m, west

• 8 m, west

A boy is pulling a cart tied with a rope at speed of 4m/s. The rope is making 30 degree with the horizontal. What is the horizontal component?

• 3.46 m/s

• 2 m/s

• 2.31m/s

• none of these

One will use Pythagorean theorem to find the magnitude of

• two horizontal vectors added

• two vertical vectors added

• one vertical and one horizontal vectors added

• direction of the vectors

A tangent function is used to find the direction of the perpendicular vectors added. Tangent is

• $\frac{\text{adjacent}}{\text{hypotenuse}}$

• $\frac{\text{opposite}}{\text{adjacent}}$

• $\frac{\text{adjacent}}{\text{opposite}}$

• $\frac{\text{hypotenuse}}{\text{adjacent}}$

A projectile is launched at an angle of  $25\degree$ above horizontal. Ignoring air resistance, what are the projectiles horizontal and vertical accelerations when it reaches its maximum height?

• Both horizontal and vertical accelerations are zero

• The horizontal acceleration is zero and the vertical acceleration is  $9.8\frac{\text{m}}{\text{s}^2}$ .

• The horizontal acceleration is  $9.8\frac{\text{m}}{s^2}$   and the vertical acceleration is zero

• Both the horizontal and vertical acceleration are  $9.8\frac{\text{m}}{\text{s}^2}$  

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A ball is kicked at an angle of  $30\degree$  from the horizontal. What happened to the velocity as the ball as it rises to the maximum height?

• increases in positive direction

• decreases in positive direction

• increases in negative direction

• decreases in negative direction

Tags

NGSS.HS-PS2-1

In a projectile, the horizontal component is independent to

• the range

• the time

• the vertical component

• all of these