1.
To find the momentum of an object you multiply what to pieces of information?
Correct Answer
B. Mass and velocity
Explanation
To find the momentum of an object, you multiply its mass and velocity. Momentum is a vector quantity that depends on both the mass (a measure of the object's inertia) and the velocity (the object's speed and direction of motion). The formula for momentum is p = m * v, where p is the momentum, m is the mass, and v is the velocity. Therefore, multiplying the mass and velocity of an object gives you its momentum.
2.
What has more momentum?
Correct Answer
C. A loaded U-haul traveling down Hwy 55
Explanation
*Remember momentum is "moving mass"
3.
For electricity to occur, ___________ must be moving
Correct Answer
electrons
Explanation
Electricity is the flow of electric charge, and in most cases, this charge is carried by electrons. Electrons are negatively charged particles that are found in atoms. When electrons move from one place to another, they create an electric current, which is the basis of electricity. Therefore, in order for electricity to occur, electrons must be moving.
4.
When you rub a balloon across your hair what happens?
Correct Answer
D. It becomes negatively charged
Explanation
When you rub a balloon across your hair, the friction between the balloon and your hair causes electrons to transfer from your hair to the balloon. This results in an excess of electrons on the surface of the balloon, giving it a negative charge.
5.
What factors affect electric forces?
Correct Answer(s)
A. Distance between charges
C. The type of charge (+ or -)
D. The amount of the charge
Explanation
The factors that affect electric forces are the distance between charges, the type of charge (+ or -), and the amount of the charge. The electric force between two charges decreases as the distance between them increases. The type of charge determines whether the forces are attractive or repulsive. Like charges (+ and + or - and -) repel each other, while opposite charges (+ and -) attract each other. Finally, the amount of charge determines the strength of the electric force. The greater the charge, the stronger the force.
6.
This symbolizes an object being ________________.
Correct Answer(s)
grounded
Explanation
This symbolizes an object being grounded. Grounding refers to the process of connecting an object to the ground or a neutral reference point to prevent the build-up of electrical charges. It helps to ensure the safety of electrical systems and protect against electrical shocks or damage caused by static electricity.
7.
If an object were positively charged it would need to give away electrons to become grounded/neutral.
Correct Answer
B. False
Explanation
If an object were positively charged, it would not need to give away electrons to become grounded/neutral. In fact, it would need to gain electrons in order to neutralize its positive charge and become grounded. Therefore, the statement is incorrect and the correct answer is False.
8.
A 1200kg four-wheeler has a momentum of 45 kg*m/s. What is the velocity of the four-wheeler?
Correct Answer
A. 0.0375 m/s
Explanation
The momentum of an object is calculated by multiplying its mass by its velocity. In this case, the momentum of the four-wheeler is given as 45 kg*m/s and its mass is 1200 kg. To find the velocity, we can rearrange the equation and solve for it. Dividing both sides of the equation by the mass gives us the formula: velocity = momentum / mass. Plugging in the given values, we get velocity = 45 kg*m/s / 1200 kg = 0.0375 m/s. Therefore, the velocity of the four-wheeler is 0.0375 m/s.
9.
What is the momentum of a 10kg bowling ball traveling at a speed of 8.2 m/s?
Correct Answer
B. 82 kg*m/s
Explanation
The momentum of an object is calculated by multiplying its mass by its velocity. In this case, the mass of the bowling ball is given as 10kg and its velocity is given as 8.2 m/s. Therefore, the momentum can be calculated as 10kg * 8.2 m/s = 82 kg*m/s.
10.
If a bowling ball and softball have the same momentum, which would have the greater velocity/speed in order to make up for the difference in mass?
Correct Answer
C. Softball
Explanation
The softball would have the greater velocity/speed in order to make up for the difference in mass. This is because momentum is directly proportional to velocity and mass. Since the momentum of both the bowling ball and softball is the same, and the mass of the bowling ball is greater than the mass of the softball, the softball would need to have a greater velocity/speed to compensate for its smaller mass and achieve the same momentum as the bowling ball.