Chapter 3 Quiz Review Part 1

A plane is flying 167 mph and encounters a 20 mph tailwind. Calculate the resultant velocity.

• 125 mph
• 130 mph
• 157 mph
• 187 mph

Wind velocity can be represented as a vector quantity.

• true
• false

The vertical component of velocity for a projectile is constant even with no air resistance.

• true
• false

Calculate the resultant velocity of a pair of 102 km velocities at right angles to each other. Round to the nearest whole number.

• 17 km/h at a 45 degree angle
• 30 km/h at a 30 degree angle
• 106 km/h at a 45 degree angle
• 144 km/h at a 45 degree angle

A vector is a quantity that has

• magnitude and time
• magnitude and direction
• time and direction

A quantity that has both magnitude and direction is called a _____.

• scalar

• vector

• resultant

When a velocity is represented as a vector

• the length of the arrow represents the speed
• the length of the arrow is drawn to a suitable scale.
• the direction of the arrow shows the direction of motion
• all of the above

What is the minimum resultant possible when adding a 5-unit vector to an 10-unit vector?

• 15

• 10

• 8
• 5

A ball rolling down a hill is a projectile.

• true

• false

A car driving into a head wind loses ground speed, and a car driving with the wind behind it gains ground speed. If a car drives at right angles to the wind, then the ground speed is

• more

• less

• unchanged