1.
The amount of potential gravitational energy possessed by an object not is proportional to
Correct Answer
B. Speed
Explanation
The amount of potential gravitational energy possessed by an object is not proportional to height, mass, or gravity. Instead, it is proportional to the object's speed. This means that as the speed of an object increases, its potential gravitational energy also increases.
2.
The amount of matter in an object
Correct Answer
D. Mass
Explanation
Mass is the correct answer because it refers to the amount of matter in an object. Mass is a fundamental property of an object and is independent of its location or the gravitational force acting on it. It is measured in kilograms and is different from weight, which is the force exerted on an object due to gravity. Gravity and acceleration are related to the effects of mass and weight, but they are not the actual measure of the amount of matter in an object.
3.
The force of gravity acting on an objects mass
Correct Answer
A. Weight
Explanation
Weight is the correct answer because it is the force of gravity acting on an object's mass. Weight is a measure of the gravitational force pulling an object towards the center of the Earth or any other celestial body. It is directly proportional to the mass of the object and can be calculated using the equation weight = mass x acceleration due to gravity.
4.
What type of motion is shem by a flat line on a velocity vs time graph?
Correct Answer
B. Constant velocity
Explanation
A flat line on a velocity vs time graph indicates that the velocity is not changing over time. This means that the object is moving at a constant speed and in a straight line without any acceleration. Therefore, the correct answer is constant velocity.
5.
What type of motion is shown by a curved line on a position vs time graph
Correct Answer
C. Acceleration
Explanation
A curved line on a position vs time graph indicates changing velocity over time. Since velocity is the rate of change of position, a curved line suggests that the object is accelerating. Acceleration refers to any change in velocity, whether it is an increase or decrease in speed, or a change in direction. Therefore, the correct answer is acceleration.
6.
What is the net force on an object that is being pushed with 80N of force but has 10N of friction acting on it?
Correct Answer
D. 70N
Explanation
The net force on an object is the vector sum of all the forces acting on it. In this case, the object is being pushed with a force of 80N, but there is also a frictional force of 10N acting in the opposite direction. Since the frictional force is opposing the applied force, it reduces the overall net force on the object. Therefore, the net force on the object is 80N - 10N = 70N.
7.
What is the net force on an object that has a 45 N force and a 10N force acting int he same direction?
Correct Answer
D. 55N
Explanation
The net force on an object is the sum of all the forces acting on it. In this case, the object has a 45 N force and a 10 N force acting in the same direction. To find the net force, we simply add the two forces together, which gives us a total of 55 N.
8.
What is the acceleration of an object whose net force is 150N and has a mass of 25kg
Correct Answer
C. 6m/s/s
Explanation
The acceleration of an object can be calculated using Newton's second law of motion, which states that the acceleration is equal to the net force acting on the object divided by its mass. In this case, the net force is given as 150N and the mass is 25kg. By dividing the net force by the mass, we get the acceleration as 6m/s/s.
9.
Which law states every action force has an equal and opposite reaction force?
Correct Answer
C. Newtons 3rd law
Explanation
Newton's 3rd law states that every action force has an equal and opposite reaction force. This means that for every force exerted on an object, there is a force of equal magnitude but in the opposite direction exerted back on the source of the original force. This law helps explain how objects interact with each other and how forces are balanced in nature. It is a fundamental principle in physics and is used to analyze and understand various phenomena, such as the motion of objects and the behavior of forces.
10.
As a ball falls, the action force is the pull of Earth's mass down on the ball. What is the reaction force?
Correct Answer
A. The pull of the ball up on the Earth
Explanation
When a ball falls, the action force is the pull of Earth's mass down on the ball. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, the reaction force in this case is the pull of the ball up on the Earth.
11.
How does acceleration of an object change in relation to its mass?
Correct Answer
C. Inversely proportional.
Explanation
The correct answer is inversely proportional. This means that as the mass of an object increases, its acceleration decreases, and vice versa. In other words, a heavier object will accelerate less than a lighter object when the same force is applied to both. This can be explained by Newton's second law of motion, which states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. Therefore, if the mass increases, the acceleration must decrease to maintain the same force-to-mass ratio.
12.
If the force acting on a cart doubles, what happens to the cart's acceleration
Correct Answer
D. It doubles.
Explanation
When the force acting on a cart doubles, according to Newton's second law of motion, the acceleration of the cart will also double. This is because acceleration is directly proportional to the force applied. Therefore, if the force is increased by a factor of 2, the acceleration will also increase by a factor of 2.
13.
In physics, work is defined as
Correct Answer
E. Force times distance.
Explanation
Work in physics is defined as the product of force and distance. This means that work is done when a force is applied to an object and it causes the object to move a certain distance. The amount of work done is directly proportional to both the force applied and the distance over which the force is applied. Therefore, the correct answer is "force times distance."
14.
What type of motion is shown by a flat line on a distance vs time graph?
Correct Answer
A. At rest
Explanation
A flat line on a distance vs time graph indicates that there is no change in the distance over time. This means that the object is not moving and is at rest.
15.
The attractice force between two masses
Correct Answer
C. Gravity
Explanation
Gravity is the correct answer because it is the force of attraction between two masses. It is a fundamental force that exists between any two objects with mass. Gravity is responsible for the acceleration of objects towards the Earth and is the force that keeps objects on the ground. It is also the force that governs the motion of celestial bodies in space.
16.
The slope of a velocity vs time graph is
Correct Answer
D. Acceleration
Explanation
The slope of a velocity vs time graph represents the rate of change of velocity over time. This is known as acceleration. Acceleration is defined as the change in velocity divided by the change in time. Therefore, the correct answer is acceleration.
17.
The spedometer on a car tells you the cars
Correct Answer
A. Instantaneous speed
Explanation
The correct answer is instantaneous speed. The speedometer on a car provides information about the current or instantaneous speed at any given moment. It measures the rate at which the car is moving at a specific point in time, giving the driver real-time feedback on their speed. This is different from average speed, which is calculated over a period of time, acceleration, which measures the rate of change of speed, and velocity, which includes the direction of motion.
18.
What is the slope of a distance vs time graph?
Correct Answer
C. Velocity
Explanation
The slope of a distance vs time graph represents the rate at which distance is changing over time. In other words, it indicates the speed or velocity of an object. Therefore, the correct answer is velocity.
19.
Which of the following are scalar?
Correct Answer(s)
B. Distance
C. Speed
Explanation
Distance and speed are scalar quantities because they only have magnitude and do not have a direction associated with them. Displacement, velocity, and acceleration are vector quantities because they have both magnitude and direction.
20.
What is your average speed if you travel 125 miles in 5 hours?
Correct Answer
C. 25 miles per hour
Explanation
The average speed is calculated by dividing the total distance traveled (125 miles) by the total time taken (5 hours). In this case, the average speed would be 25 miles per hour.
21.
Correct Answer
A. Option 1
Explanation
The given correct answer is Option 1. However, without any context or information about the question or the options, it is not possible to provide a specific explanation for why Option 1 is the correct answer.
22.
A car is traveling at 21.0 m/s. It slows to a stop at a constant rate over 5.00 s. How far does the car travel during those 5.00 seconds before it stops?
Correct Answer
B. 52.5 m
Explanation
The car is traveling at a constant rate of 21.0 m/s. It slows down and comes to a stop over a period of 5.00 seconds. Since the car is decelerating at a constant rate, we can use the equation d = (v_i + v_f) * t / 2 to calculate the distance traveled. The initial velocity (v_i) is 21.0 m/s, the final velocity (v_f) is 0 m/s, and the time (t) is 5.00 seconds. Plugging these values into the equation, we get d = (21.0 + 0) * 5.00 / 2 = 52.5 m. Therefore, the car travels 52.5 meters during those 5.00 seconds before it stops.
23.
A 5.000 kg crate is accelerated from 5.000 m/s to 10.00 m/s. What is the amount of work needed to accelerate the crate, to the nearest tenth of a joule?
Correct Answer
187.5
24.
Radar works by sending out radio signals. The reflected signals are measured and analyzed to determine some of the characteristics of the object that reflected the signals. One type of radar emits radio signals having a wavelength of 1.5 meters. What is the frequency of these signals?
Correct Answer
B. 2.0 x 10^8 HZ
Explanation
The frequency of a wave is inversely proportional to its wavelength. Since the radar emits radio signals with a wavelength of 1.5 meters, the frequency can be calculated by dividing the speed of light (approximately 3 x 10^8 meters per second) by the wavelength. This gives us a frequency of 2.0 x 10^8 HZ.
25.
Using a diffraction grating, a student looks at an incandescent lightbulb and a hydrogen-gas–discharge tube. Why does the student see fewer colors from the hydrogen-gas–discharge tube than from the incandescent lightbulb?
Correct Answer
C. Only certain electron transitions are possible in a hydrogen atom.
Explanation
The reason the student sees fewer colors from the hydrogen-gas–discharge tube than from the incandescent lightbulb is because only certain electron transitions are possible in a hydrogen atom. This means that the hydrogen gas emits or absorbs light only at specific wavelengths, resulting in a limited range of colors. In contrast, the incandescent lightbulb emits a continuous spectrum of light, which includes a wider range of colors.
26.
Which of the following statements best describes the motion of air molecules that transmit sound waves?
Correct Answer
B. The air molecules oscillate parallel to the direction of propagation and remain in the same general position.
Explanation
The correct answer is "The air molecules oscillate parallel to the direction of propagation and remain in the same general position." This means that as sound waves travel through the air, the air molecules vibrate back and forth in the same direction as the wave, but they do not actually move along with the wave. They stay in their original position while vibrating. This is why sound waves can travel through a medium without causing a net movement of the medium itself.
27.
Correct Answer
C. 12.8 m/s^2
28.
Correct Answer
C. 1.8 A
29.
Correct Answer
A. 1
30.
Correct Answer
C. Setup M
31.
Correct Answer
A. Some of the work done on the cart became the cart’s potential energy, and some of the work was converted into heat by friction.
32.
Correct Answer
D. Magnitude of momentum