PHYSICS 201 - Module 05.1D Kinematics

A car moves from position A to position B. The smaller vector shows the car's initial position and the larger vector shows the car's final position. Which of the following vectors best represents the car's displacement from point A to point B?

----------------------------->

Which of the following velocity versus time graphs best represents the motion of a ball that was thrown upward, from just after it was thrown until just before it is caught on the way down?

0----------------------------------------------------t/s

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

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

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

the object is slowing down

If an object's acceleration vector points in the same direction as its instantaneous velocity vector then you can conclude __________.

the object is speed up

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

the objectâs distance from a reference point and its angle measured from a reference line

Which of these equations is the correct mathematical representation of this velocity versus time graph?

v=vi_at

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

x=xi+vt

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?

30 m/s

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

9.8 m/s2

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

<-------

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

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

This position versus time graph exhibits what kind of motion between points Q and R?

A moving object that is speeding up

This velocity versus time graph exhibits what kind of motion?

An object moving at a constant speed

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?

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

When you drop a ball, what is true about its motion?

It falls and increases in speed at a rate of 9.8 m/s every second.

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).

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

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

The ballâs acceleration is always directed downward

In the motion diagram, a car is driving to the right and there are equal time increments between frames. How is the car moving?

The car is slowing down.

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?

The instant at point R

This position versus time graph represents the motion of an object moving in a straight line. What is true about the object's motion?

The object is at rest.

This position versus time graph represents the motion of an object moving in a straight line. What is true about the object's motion?

The object is moving at a constant speed.

A ball is dropped off of a tall building and falls for 2 seconds before landing on a balcony. A rock is then dropped from the top of the building and falls for 4 seconds before landing on the ground. How does the final speed (meaning the speed it had just before landing) of the rock compare to the final speed of the ball?

The rock's final speed is twice as much as the ball's final speed

In the motion diagram, a skateboarder is rolling to the right and there are equal time increments between frames. How is the skateboarder moving?

The skateboarder is moving at a constant speed.