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The vertical component of the acceleration of an object experiencing projectile motion is.

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Date created

Mar 1, 2020

Cards (35)

Section 1

(35 cards)

The vertical component of the acceleration of an object experiencing projectile motion is.

Front

downward

Back

An object is dropped from the top of a building and hits the ground 3 seconds after it is released. What is the approximate speed of the object at the instant it hits the ground?

Front

30 m/s

Back

- [ ] A student must design an experiment to determine the acceleration of a cart that rolls down a small incline after it is released from rest. The student has access to a timer, a meterstick, and a slow-motion camera that takes a photograph every 1/60 of a second. The angle that the incline makes with the horizontal is unknown, and the length of the incline is unknown. Which of the following procedures could the student use to determine the cart's acceleration? Select two answers.

Front

1. Use the slow-motion camera to film the cart as it rolls down the incline alongside a meterstick that is attached to the incline. 2.Use the timer to record the time it takes the cart to travel alongside a meterstick that is attached to the incline.

Back

A bullet is fired from a gun horizontally, at a height of 1 m. At the same time, another identical bullet is dropped from the same height. What is true about the impact velocities (or final velocities) of these two bullets.

Front

The bullet fired from the gun will have a greater impact velocity than the dropped bullet.

Back

Instead of dropping a ball, you throw a ball directly downward. After releasing the ball, what is the magnitude of its acceleration?

Front

9.8 m/s/s

Back

- [ ] This velocity versus time graph exhibits what kind of motion?

Front

A moving object that is speeding up at a constant rate

Back

- [ ] An object is launched upward at angle The trajectory and three positions of the object, X, Y, and Z, are shown in the figure. Position X is higher than position Z with respect to the ground, and position Y is at the object's maximum vertical position. Which of the following claims is correct about the system that consists of only the object?

Front

The object's acceleration is the same at positions X, Y, and Z

Back

The position versus time graph exhibits the one-dimensional motion of an object. At which instant in time does the object's velocity have the greatest magnitude?

Front

R

Back

What shape is the path that all objects in projectile motion follow?

Front

parabolic path

Back

During volleyball practice a volleyball is tossed over a net, starting from a height of 1.5 meters above the ground. After reaching the top of its trajectory it returns to its original height as it falls. How does the motion of the ball at the top of its trajectory compare to its motion as it passes its original height?

Front

The ball's acceleration is the same at the two moments, but its velocity is different.

Back

In the motion diagram, a car is moving to the right and there are equal time increments between frames. Velocity vectors would be drawn to the right to accurately reflect the motion of the vehicle. What is the direction of the car's acceleration vector?

Front

left

Back

Which of the following objects is considered to be in free fall?

Front

A hammer that is tossed upward by an astronaut on the moon (where there is no atmosphere)

Back

- [ ] if a pt graph is a straight horizontal line its at ____

Front

rest

Back

- [ ] To define the position of an object in a plane, you need to measure __________.

Front

the object's distance from a reference point and its angle measured from a reference line

Back

- [ ] An object travels along a straight, horizontal surface with an initial speed of 2 m/s . The velocity of the object as a function of time is given in the table above. Which of the following graphs represents the object's acceleration as a function of time?

Front

Back

A ball traveling at a speed v0rolls off a desk and lands at a horizontal distance x0 away from the desk, as shown in the figure. The ball is then rolled off of the same desk at a speed of 3 v0. At what horizontal distance will the ball land from the table?

Front

3xo

Back

Rock X is released from rest at the top of a cliff that is on Earth. A short time later, Rock Y is released from rest from the same location as Rock X. Both rocks fall for several seconds before landing on the ground directly below the cliff. Frictional forces are considered to be negligible.After Rock Y is released from rest several seconds after Rock X is released from rest, what happens to the separation distance S between the rocks as they fall but before they reach the ground, and why? Take the positive direction to be downward.

Front

s increases because at all times Rock X falls with a greater speed than Rock Y

Back

- [ ] Instead of dropping a ball, you throw a ball directly downward. After releasing the ball, what is the magnitude of its acceleration?

Front

9.8 m/s/s

Back

A student drops a rock from rest at a distance h above the ground such that the rock hits the ground at time t0. At what distance above the ground should the rock be dropped such that it hits the ground at a

Front

4h

Back

- [ ] Rock X is released from rest at the top of a cliff that is on Earth. A short time later, Rock Y is released from rest from the same location as Rock X. Both rocks fall for several seconds before landing on the ground directly below the cliff. Frictional forces are considered to be negligible.Which of the following graphs best represents the vertical displacement of Rock X as a function of time starting from immediately after the rock is released from rest? Take the positive direction to be downward.

Front

Back

The motion of two cars, A and B, is described with these position versus time graphs. From these graphs, what can you conclude about the motion of the cars?

Front

Car A is driving at a faster constant speed than car B.

Back

A student drops a rock from rest at a distance h above the ground such that the rock hits the ground at time At what distance above the ground should the rock be dropped such that it hits the ground at a time 2

Front

4h

Back

If an object's acceleration vector points in the opposite direction of the instantaneous velocity vector, then you can conclude.

Front

slowing down

Back

In the motion diagram, a car is moving to the right and there are equal time increments between frames. Velocity vectors would be drawn to the right to accurately reflect the motion of the vehicle. What is the direction of the car's acceleration vector?

Front

left

Back

In an airless test-facility, a bullet is fired from a gun horizontally, at a height of 1 m. At the same time, another identical bullet is dropped from the same height. What is true about the acceleration of the two bullets while they are in flight?

Front

The bullet fired from the gun and the dropped bullet have the same acceleration while they are in flight.

Back

Of the following choices, which is the best description of g?

Front

g is the magnitude of the acceleration due to the force of gravity.

Back

When you throw a ball directly upward, what is true about its acceleration?

Front

The ball's acceleration is always directed downward.

Back

A basketball is moving in projectile motion. What can you say about the ball's velocity at the top of its trajectory?

Front

The velocity at the top is equal to the x-component of the initial

Back

The horizontal component of the acceleration of an object experiencing projectile motion is.

Front

zero

Back

The horizontal component of the velocity of an object experiencing projectile motion __________.

Front

stays constant the entire time it is in flight

Back

- [ ] Which of these equations is the correct mathematical representation of this position versus time graph?

Front

x=xi + vt

Back

- [ ] Rock X is released from rest at the top of a cliff that is on Earth. A short time later, Rock Y is released from rest from the same location as Rock X. Both rocks fall for several seconds before landing on the ground directly below the cliff. Frictional forces are considered to be negligible. - [ ] Which of the following graphs correctly shows the vertical velocity of rock X as a function of time? Take the positive direction to be upward.

Front

Back

A ball is dropped off of a tall building and falls for 6 seconds before landing on the ground. Consider how far the ball falls in its first 3 seconds of free fall (from t = 0 s to t = 3 s) compared to how far it falls in its next 3 seconds (from t = 3 s to t = 6 s).

Front

The ball falls farther in the second 3-second interval than it does in the first interval

Back

Two objects, object X and objectY , are held together by a light string and are released from rest near a planet's surface in the orientation that is shown in the figure. Object X has a greater mass than object Y. A graph of the acceleration as a function of time for the system's center of mass is shown for the 4s

Front

vx=vs

Back

If you increase the initial vertical velocity of a projectile what happens to its horizontal velocity?

Front

The horizontal velocity won't necessarily be affected if the initial vertical velocity increases.

Back