Which of the following values does not take into account direction?
a. Vector values
b. Velocity
c. Distance
d. Acceleration
c. Distance
A typical freight train travels at speeds of 50 mph, but takes minutes to get going. A cheetah can sprint at speeds of 80 mph, but it only needs seconds to reach top speed. Which has the greater acceleration and which has the greater velocity?
a. The freight train has a greater acceleration and a greater velocity.
b. The freight train has a greater acceleration but not greater velocity.
c. The cheetah has a greater acceleration but not a greater velocity.
d. The cheetah has a greater acceleration and a greater velocity.
D. The cheetah has a greater acceleration and a greater velocity.
If we drop a feather, a bowling ball, and a car on the moon, which would hit the ground first?
a. The car
b. The car and bowling ball
c. The bowling ball
d. All 3 of them
All 3 of them.
At what angle should a projectile be launched to achieve the maximum height?
90o
If a cannonball is being shot up into the air, the average velocity of the cannonball would be:
a. Positive, because it is going up the y-axis
b. Positive, because it is going right on the x-axis
c. Negative, because it is going down on the y-axis
d. Negative, because it is going left on the x-axis
a. Positive, because it is going up the y-axis
A car, initially at 65m/s, begins to slow down in a straight line, accelerating at -5 m/s^2. Which of the following best describes his motion?
a. The car decreases speed by 5m/s every second.
b. The car increases speed by 5m/s every second.
c. The car decreases acceleration by 5m/s^2 every second.
d. The car increases acceleration by 5m/s^2 every second.
a. The car decreases speed by 5m/s every second.
A space shuttle is returning from a mission in space. It is currently burning fuel to help slow it down as it enters the atmosphere. Is the space shuttle in free fall? Why?
a. Yes, because it is not on the ground.
b. No, because the fuel provides another force besides gravity.
c. Yes, because it is falling down towards earth.
d. No, because air resistance is greater than the force of gravity.
B. No, because the fuel provides another force besides gravity
What is true about the horizontal component of velocity in projectile motion?
a. The speed is constant
b. The speed is always increasing
c. The acceleration is -10 m/s
d. The only force acting on the object is gravity.
a. The speed is constant
The position of the car is shown in one-second time intervals. Describe the car’s speed.
Car is slowing down.
How would one describe the velocity and acceleration of the car shown below?
a. The velocity and acceleration are both positive.
b. The velocity is positive but the acceleration is negative.
c. The velocity is negative but the acceleration is positive.
d. The velocity and acceleration are both negative.
c. The velocity is negative but the acceleration is positive.
A football is kicked up into the air at a speed of 84 m/s. After 7 seconds, what is the direction of the football’s velocity?
a. Positive (Upwards)
b. Negative (Downwards)
c. Neither
Negative (Downwards)
A ball takes 7 seconds to reach the peak of the trajectory. What is the total airtime of the ball?
14 seconds
A student releases a marble from the top of a ramp. The marble increases speed steadily and travels 124 cm in 8.3s. *If cannot be determined, answer cbd*
What is the final speed of the marble?
29.9 cm/s
A car slows down at a rate of 3m/s^2 for 534 meters.
How long does it take the car to reach the end? *If cannot be determined, answer cbd*
Cannot be Determined
A student drops a ball off the top of a building. It takes the ball 5.7 seconds to hit the ground. What is the speed of the ball right before it hits the ground? *If cannot be determined, answer cbd*
57 m/s
A student fires a cannonball horizontally at a speed of 25 m/s that lands 130 m away from the building. Neglect drag. What is the height of the building?
135.2 m
A man throws a ball straight down off the side of a 550 ft building. The ball hits the ground 11.3s later at a speed of 82 ft/s. *If cannot be determined, answer cbd*
What was the initial velocity of the ball?
15.3 ft/s
An airport contains a 3000 m runway for its planes. If a plane starts at rest and needs to achieve a speed of 400 mph, what acceleration (in m/s^2) does the plane need to reach this speed before going off the runway? *Convert*
5.32 m/s^2
A student kicks a football vertically upwards with an initial speed of 42 mph. Neglect air drag and initial height and horizontal motion of the football. *If cannot be determined, answer cbd*
What is the max height of the football? *Convert*
17.62 m
A student kicks a football diagonally with an initial speed of 48.5 m/s. Neglect drag and the initial height of the football. How far away did the ball land?
124.9m