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Physics Unit 1 Test
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Gravity
Terms in this set (34)
Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled.
The displacement is either less than or equal to the distance traveled
The slope of a line connecting two points on a position versus time graph gives
average velocity
Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?
The average speed is always greater than or equal to the magnitude of the average velocity
The slope of a tangent line at a given time value on a position versus time graph gives
instantaneous velocity
When is the average velocity of an object equal to the instantaneous velocity?
only when the velocity is constant
Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration.
The acceleration must be equal to zero
At a given instant, the acceleration of a certain particle is zero. This means that
the velocity is not changing at that instant
The slope of a line connecting two points on a velocity versus time graph gives
average acceleration
The slope of a tangent line at a give time value on a velocity versus time graph gives
instantaneous acceleration
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
in equal times its velocity changes by equal amounts
During the time that the acceleration of a particle is constant, its velocity versus time curve is
a straight line
The motion of a particle described in the velocity versus time graph shown in Figure 2-1. We can say its speed
increases
Suppose that a car is traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
the car is decelerating, and its acceleration is negative
Suppose that a car is traveling to the Westt (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration
the car is decelerating, and its acceleration is positive
An object is moving with a constant non-zero velocity in the +x-axis. The position versus time graph of this object is
a straight line making an angle with the time axis
An object is moving with a constant non-zero acceleration in the +x-axis. The position versus time graph of this object is
a parabolic curve
An object is moving with a constant non-zero velocity in the +x-axis. The velocity versus time graph of this object is
a horizontal straight line
An object is moving with a constant non-zero acceleration in the +x-axis. The velocity versus time graph of this object is
a straight line making an angle with the time axis
If the position versus time graph of an object is a horizontal line, the object is
at rest
If the velocity versus time graph of an object is a horizontal line, the object is
moving with a constant non-zero speed
The area under the curve in a velocity versus time graph gives
displacement
A car moving initially with velocity V1 with deceleration a comes to a full stop after traveling a distance d. We can say that the velocity of the car after traveling a distance d/2 is
greater than V1/2
A car moving initially with velocity V is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubles, the distance required to stop would
quadruple
A car traveling with velocity V is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubles, the time required to stop would
double as well
Refer to Figure 2-6. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery, what is the distance you have traveled?
10.5 km
Refer to Figure 2-6. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery, what is your displacement?
2.5 km South
A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?
0 m/s
A car is making a 12-mile trip. It travels the first 6.0 at 30 miles per hour and the last 6.0 miles at 60 miles per hour. What is the car's average speed fro the entire trip?
40 mph
A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. He completes one lap in 2.0 minutes. What is his average speed?
4.2 m/s
Figure 2-10 shows the velocity versus time graph for a basketball player traveling up and down the court in a straight line path. Find the net displacement of the player for the 10 s shown on the graph.
18 m
A car starts from rest and accelerates at 6.00 m/s2. How far does it travel in 3.00 s?
27.0 m
A car is moving with a constant acceleration. At t=5.0 s, its velocity is 8.0 m/s and at t=8.0 s, its velocity is 12.0 m/s. What is the distance traveled in that interval of time?
30 m
An airplane starts from rest and accelerates at 10.8 m/s2. What is its speed at the end of a 400 m-long runway?
93.0 m/s
A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, giving the car a deceleration of 3.50 m/s2. How far does the car travel after the driver put on the brakes before it comes to a stop?
146 m
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