AP Physics Unit 2

Give an example of angles that will produce trajectories with the same range?

20 degrees and 70 degrees.

Your motorboat can move at 30 km/hr in still water. How much time will it take you to move 12 km upstream, in a river flowing at 6 km/hr?

30 Minutes.

At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?

45 degrees.

If a baseball is thrown at a 30 degree angle, its range in absence of air resistance is less than one thrown at____?

55 degrees.

A pilot drops a bomb from a plane flying horizontally. When the bomb hits the ground, the horizontal location of the plane will ________.

Be over the bomb.

Bullet G is dropped, from rest, at the same time that another bullet H is fired horizontally from a rifle. If both bullets leave from the same height above the ground then, ______.

Both bullets hit the ground at the same time.

If you drive west at 20 km/hr, then drive east at 15 km/hr, your average velocity will be ______?

Cannot be determined, insufficient information (Need the time).

Ignoring air resistance, the vertical component of a projectile's velocity _________.

Continuously decreases.

True or False: A single vector can be replaced by two vectors in the X and Y directions. The X and Y vectors are called resultants of the original vector.

False.

A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages will ______.

Increase.

You hit a tennis ball over the net. When the ball reaches its maximum height, its speed is _________.

Less than its initial speed.

An airplane flying into a headwind loses ground speed, and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind, the ground speed is _______?

More.

In the absence of air resistance, doubling the initial velocity of a projectile launched horizontally results in the flight time being _____?

Multiplied by 2.

In the absence of air resistance, doubling the initial velocity of a projectile launched at an angle to the horizontal results in its range being _____?

Multiplied by 4.

Ignoring air resistance, the horizontal component of a projectile's velocity ___________.

Remains constant.

An automobile is moving toward the east at 50 km/hr and a wind is blowing from the North at 50 km/hr. From the perspective of the passenger in the car, the wind is blowing toward the ______?

Southwest.

If the acceleration vector of an object is directed anti-parallel to the velocity vector ________.

The object is slowing down.

If the acceleration of an object is always directed perpendicular to its velocity __________.

The object is turning.

Suppose that several projectiles are fired. Will the one with the farthest range, the one with the highest maximum elevation, or the one with the greatest initial velocity be in the air the longest?

The one with the highest maximum elevation.

True or False: A vector cannot have a zero magnitude if one of its components is not zero.

True.

In the absence of air resistance, doubling the initial velocity of a projectile launched horizontally results in the flight time being _____?

Unchanged.

You shoot an arrow in a high arc toward a target located some distance away. At the highest point in its flight, the arrow's _______?

Velocity and Acceleration are both nonzero.

Consider a plane flying with groundspeed Vg and airspeed Va in a wind with velocity V. What is its relationship?

Vg can have any value between Va+V and Va-V.

An arrow is shot, from a bow, at an original speed of Vo. When it returns to the same horizontal level, its speed will be ________.

Vo.