Chapter 10: Projectile and Satellite Motion Flashcards

1
Q

Any object that moves through the air or through space, acted on only by gravity. (and air resistance, if any.)

A

Projectile

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

A curved path followed by a projectile acting under the influence of gravity only.

A

Parabola

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Ignoring air drag, how many meters below will a projectile fall Considering where it would have reached if there were no gravity?

A

4.9t²

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

If the horizontal component of the Cannon Falls velocity is 20 m/s, how far down range will the cannonball be in five seconds?

A

d = vt
d = 20(5)
d = 100 m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

A baseball is batted at an angle into the air. Once airborne and ignoring air drag what is the balls acceleration vertically? Horizontally?

A

The vertical acceleration is G (directed downwards) Because the force of gravity is vertical. The horizontal acceleration is zero because no horizontal force acts on the bar.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What part of a baseballs trajectory does the baseball have a minimum speed?

A

A balls minimum speed occurs at the top of its trajectory. If it is launched vertically, it’s speed at the top is zero. If launched at an angle, the vertical component of velocity is zero at the top, leaving only the horizontal component. So the speed at the top is equal to the horizontal component of the balls velocity at any point.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Consider a batted baseball that follows a parabolic path on a day when the sun is directly overhead. How does the speed of the balls shadow across the field compare with the balls horizontal component of velocity?

A

They are the same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

When a ball is thrown upward at an angle, what happens to the vertical component of its velocity as it rises? As it falls? Suppose that air resistance can be neglected.

A

It decreases while rising, but it increases while falling.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Wanna ball is thrown upward at an angle, what happens to the horizontal component of its velocity as it rises? Has it falls? Suppose that air resistance can be neglected.

A

Rising or falling, it does not change.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How many meters does a tossed baseball fall beneath a straight line path in traveling for one second? For two seconds?

A

In one second, it falls 5 m beneath the line. For two seconds, the ball falls 20 m beneath the line.

(This is found using the equation 1/2 times gravity constant times t²)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

You are in an airplane flying 1000 km/h horizontally when an engine falls off. Neglecting air resistance, assume it takes 30 seconds for the engine to hit the ground. Find the height of the airplane.

A

4.4 km (4,410 m) Use d = .5(9.8)(t²)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

you’re in an airplane flying 1000 km/h (280 m/s) horizontally when an engine falls off. Neglecting air resistance, assume it takes 30 seconds for the engine to hit the ground. Find the horizontal distance that the engine moves during its fall.

A

8.4 s. (d = vt)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

A projectile or smaller celestial body that orbits a larger celestial body

A

Satellite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Calculate the speed of a projectile that covers a distance of 8000 meters in the time it takes for it to fall vertically 5 meters.

A

s = d/t
8000 / time to fall 5 meters
8000 / 1
= 8000 m/s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What do we call such a high-speed projectile without air drag or obstacles?

A

earth satellite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In circular orbit, the speed of a satellite is not changed by gravity: Gravity changes only the…

A

Direction

17
Q

Why doesn’t gravity that acts on a bowling ball change its speed?

A

Gravity pulls straight downward with no component of force acting forward or backward.

18
Q

Does a satellite in circular orbit always move in a direction perpendicular to the force of gravity that acts on it?

A

Yes, just like the radius of a circle is everywhere perpendicular to its circumference.

19
Q

Can the force of gravity change an orbiting satellites speed?

A

No. It can only change the direction.

20
Q

Can it be truthfully stated that a satellite is in a state of free fall?

A

Yes. It falls around the body it is attracted to rather than into it.