Physics Final
A runner travels 60.0 m at a steady speed of 5.0 m/s. The time taken is
12s
A freely falling object starts from rest. After falling for 1 second, it will have a speed of about
10 m/s
An apple falls from a tree and hits the ground 5 m below. it hits the ground with a speed of about
10 m/s
A car accelerates at 2m/s squared. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 20 m/s?
10 seconds
A ball is thrown 125 meters straight upward and then falls into the same distance back to earth. Neglecting air resistance, its total time in the air is about
10s
The average velocity of an object is 2 meters per second for 6.0 seconds. What is the total distance travelled by the object?
12 m
Starting from rest, the distance a freely falling object will fall in 10 seconds is about
500 m
If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by
about 10 m/s
It takes 6 s for a stone to fall to the bottom of a mineshaft. How deep is the shaft?
about 180 m
The position vs. time graph below represents the relationship between distance and time for an object moving in a straight line. According to the graph, the object is.
accelerating
A ball is thrown into the air. At the highest point, the ball has zero velocity and zero acceleration.
false
Average speed is defined as the time it takes for a trip divided by the distance.
false
If a body has an acceleration of -3 m/s squared, it MUST be slowing down.
false
While driving a car, it is possible to make a turn without accelerating if you keep the speed constant while turning.
false
Consider drops of water leaking from a water faucet. As the drops fall they
get farther apart
When you look at the speedometer in a moving car you can see the car's
instantaneous speed
The hang time (time one's feet are off the ground in a jump) for most athletes is
less than 1 second
Galileo's use of inclined planes allowed him to effectively
slow down the acceleration of free fall
Which of the following statements correctly describes the motion of an object depicted by the position vs. time graph below.
the object has constant velocity.
Drop a rock from a 5m height and it accelerates at -10m/s/s and strikes the ground 1 second later. Drop the same rock from a height of 2.5 m and its acceleration of the fall is
the same
A ball is thrown upwards and caught when it comes back down. Neglecting air resistance, its speed when caught is
the same speed it had when thrown upwards
Change in velocity can be obtained from
the slope of a velocity time graph
An object thrown straight up has a positive velocity and a negative acceleration.
true
Even though a car is slowing down, it is still accelerating, int the most general definition of acceleration.
true
If a body travels at a constant speed, then the distance it travels varies directly with the time elapsed.
true
As an object falls freely in a vacuum, its
velocity increases
When a rock thrown straight upwards gets to the exact top of its path, its
velocity is zero, and its acceleration is about -10 m/s squared
Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is
60 km/h
A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about
60 m/s
A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball the instant before it is caught would be
the same as the speed it had when thrown upwards.
suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?
your velocity is constant
The acceleration due to gravity on earth is approximately
-10 m/s squared
A body falls freely from rest near the surface of the earth. The distance the object falls in 2 seconds is
-20 m
If a car is traveling at a constant average speed of 60 kilometers per hour, how long does it take to travel 12 kilometers
0.2 hours
if a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about
1 second
The vertical height attained by a basketball player who achieves a hang time of a full one second is about
1.2 m
A car accelerates uniformly from 3.0 m/s to 12.0 m/s in 4.5 s. The magnitude of the acceleration is
2.0 m/s squared
Mrs. sabato sees mr millam under her balcony. Mrs. Sabato drops a water balloon that falls freely for 2 seconds before striking mr millcm on the head and getting him soaking wet. How far did the balloon travel before striking Mr. Millam?
20 m
If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s/s, then its speed reading would increase each second by
20 m/s
A radar transmitter sends out a pulse that is reflected from the moons surface. The signal returns 2.7 s after it is sent. What is the best estimate of the moon's distance from the earth if light travels at 3.0 x10^8 m/s?
4.0 x10^8 m
Suppose a jumper claims a hang time of 2 seconds. Then that jumper must be able to jump a vertical distance of
5 m
Suppose a car is moving in a straight line and steadily increases its speed, it moves from 35km/h to 40km/h the first second and from 40km/h to 45km/h the next second. What is the car's acceleration?
5km/h s
If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is
6 km/h/s
A car accelerates from rest at 2 meters per second per second. What is its speed 3 seconds after the car starts moving?
6 m/s
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration
6 m/s^2
If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about
6 seconds
Consider the following graph. The average speed is greatest during which time interval
8s-10s
If an object falls with constant acceleration, the velocity of the object must
continually change by the same amount each second
speed is
d. all of the above: a measure of how fast something is moving, always measured in terms of a unit of distance, divided by a unit of time.
one possible unit of speed is
d. all of the above: miles per hour, light years per country, kilometers per hour.
A ball tossed vertically upward rises, reaches its highest point, then falls back to its starting point. During this time the acceleration of the ball is always
directed downward
The area under a velocity time graph represents
displacement
The two measurements for calculating average speed are
distance and time
Mrs. Sabato is looking at a new Garden apartment in downtown scottsdale and is out on the balcony and decides to find out how far up she is. she takes out a water balloon and drops it over the railing. If it takes 3.0 s to hit the ground, how far is the ground beneath her? (g=10m/s squared)
-45 m
An object is released from a height of 11 m. Which one of the following best represents the displacement of the object 1.0s after it falls freely from rest? (g=-.10 m/s squared)
-5.0 m
An object travels 8 meters in the first second of travel, 8 meters again during the second second of travel, and 8 meters again during the third second. Its acceleration in meters per second is
0
What is the acceleration a car that maintains a constant velocity of 100 km/h for 10 seconds
0
A ball is throw straight up. At the top of its path its instantaneous speed is
0 m/s
A car accelerates at 2 m/s squared. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?
15 s
Starting from rest, an object rolls freely down an incline that is 10 meters long in 2 seconds. The acceleration of the object is approximately
5 m/s squared
If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?
Neither- they will both reach the bottom at the same time
If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?
The coin
Suppose an object is in free fall. Each second the object falls
a larger distance than in the second before
A ball is thrown straight up. At the top of its path its acceleration is
about 10 m/s squared
When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?
about 10 m/s squared
In the absence of air resistance, objects fall at constant
acceleration
A unit of acceleration is meters per second
false
When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration
is g;no more, no less.
Which of the following is NOT an acceleration unit?
km/s
A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is
less than the speed it had when thrown upwards
Two balls that are exactly the same size and shape. One ball is made out of aluminum and has a mass of .5 kg. The other one is made out of uranium (its covered with lead so that no radiation leaks out). And has a mass of 6.0 kg. If they are released at the same instant from the same height of 20m they will reach the ground at
the same time with the same speeds
On a position vs. time graph, the slope of the line represents the
velocity
Acceleration is defined as the CHANGE in
velocity divided by the time interval
As an object freely falls, its
velocity increases