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Physics 40s exam > 2D Kinematics > Flashcards

Flashcards in 2D Kinematics Deck (11):
1

The Motion of every projectile contains....

a. A constant horizontal velocity
b. A constant vertical velocity
c. Both constant horizontal velocities and constant vertical velocities.
d. Two dimensions which both contain changing velocities.

a.) A constant horizontal velocity

2

A rifle shoots a bullet horizontally towards a wall. The instant the bullet leaves the muzzle a piece of mud falls off of the muzzle. Given both the mud and the bullet travel freely, which of the following statements is definitely true?

a. The bullet will hit the wall after the mud hits the ground.
b. The bullet will hit the wall at the same time as the mud hits the ground.
c. The bullet will fall short of the wall and hits the ground after the mud does.
d. The bullet and the mud will experience the same vertical displacement until the bullet hits the wall.

d. The bullet and the mud will experience the same vertical displacement until the bullet hits the wall.

3

A student is holding an apple inside a mini-van. The apple is directly over an 'X' taped onto a car mat directly underneath it. Where will the apple land if the student releases the apple while the mini-van travels 100 km/h eastwards?

a. A little west of the X
b. A little east of the X
c. Right on the X
d. It depends on the frame of reference

c. Right on the X

4

When a projectile is at its highest point in its trajectory, what can be said about its velocity?

a. It is zero
b. It is going faster than it was moments earlier
c. It is as large as it is going to get, maximum velocity
d. It is the same as its initial velocity
e. None of the above.

e. None of the above

5

If air resistance is removed, a projectile's trajectory has the shape of a ...

a. Sine function
b. Asymptote
c. Inverse function
d. Parabola

d. Parabola

6

What is the best angle to kick a soccer ball off of the field, to ensure it'll travel the greatest distance down the field? Given air resistance is not a factor.

a. 30°
b. slightly below 45°
c. 45°
d. slightly above 45°
e. 180°

c. 45°

7

What is the best angle for a projectile launcher on a 2.0 m platform, to ensure it'll travel with the greatest range till it hits the floor on the other side of the classroom? given air resistance is not a factor.

a. 30°
b. slightly below 45°
c. 45°
d. slightly above 45°
e. 180°

b. slightly below 45°

8

8. A golf ball is hit down a level fairway, with a 9 iron with a face angle of 47°. The same golf ball was hit with the same speed from the same location using a specialty club with a face angle of 43°. Which of the following is true?

a. The first ball will go further
b. The second ball will go farther
c. Both balls will travel the same distance

c. Bath balls will travel the same distance

9

Given the diagram below, determine what will happen after the two canons are fired simultaneously. The cannons are aimed directly at each other and have identical muzzle velocities.

a. The bullets will both collide closer to cannon A.
b. The bullets will both collide simultaneously closer to cannon B.
c. The bullets will both collide equidistant from each cannon.
d. The bullets can not collide mid-air.

c. The bullets will both collide equidistant from each cannon.

10

What is the magnitude of the velocity of the swimmer relative to ground if a swimmer swimming at 4.0 m/s North relative to the water, in a river that if flowing 3.0 m/s East relative to the ground?

a. 1.0 m/s
b. 5.0 m/s
c. 7.0 m/s
d. 12 m/s

b. 5.0 m/s

11

If a golf ball is hit with an initial velocity of 60 m/s 30° above the horizon, off of a level ground fairway, what will the ball's velocity be as it enters the hole? Assume no air resistance.

a. It will land with the same speed and direction it had initially
b. It will land with the same speed but a different direction that it had initially.
c. It will land with a slower speed and the same direction it had initially
d. It will land with a slower speed and a different direction then it had initially.

b. It will land with the same speed but a different direction that it had initially.