Projectile Motion

Which of these expresses a vector quantity?

• 10 Kg
• 10 kg to the north
• 10 m/s
• 10 m/s to the north

An ultra-light aircraft traveling north at 40 km/h in a 30-km/h crosswind (at right angles) has a groundspeed of

• 30 km/h
• 40 km/h
• 50 km/h
• 60 km/h

A ball launched into the air at 45° to the horizontal initially has

• equal horizontal and vertical components.
• components that do not change in flight.
• components that affect each other throughout flight.
• a greater component of velocity than the vertical component.

When no air resistance acts on a fast-moving baseball, its acceleration is

• downward, g.
• due to a combination of constant horizontal motion and accelerated downward motion.
• opposite to the force of gravity.
• at right angles.

When no air resistance acts on a projectile, its horizontal acceleration is

• g.
• at right angles to g.
• upward, g.
• zero.

Without air resistance, the time for a vertically tossed ball to return to where it was thrown is

• 10 m/s for every second in the air.
• the same as the time going upward.
• less than the time going upward.
• more than the time going upward.

A vector is a quantity that has

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

A scalar is a quantity that has

• direction
• magnitude
• time
• color

When representing velocity as a vector,

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

In order to find the components of a vector, you should

• draw the vector with correct magnitude and orientation.
• measure the sides of the rectangle.
• draw a rectangle so that the vector is the diagonal.
• all of the above