1. In boxing, fighters wear padded gloves to protect their hands. Which statement explains why a fighter’s hands need protection?
A. There is an equal and opposite velocity impact the hand.
B. There is an equal and opposite acceleration impact the hand.
C. There is an equal and opposite momentum impacting the hand.
D. There is an equal and opposite force impacting the hand.
2. Two balls collide. Under which circumstances will they exert equal and opposite forces on each other?
A. If the sustem is closed
B. in all situations
C. If both are moving at the same speed when they collide
D. if they have the same mass
3. In a closed system, how does an increase in mass change the velocity of an impacted object?
A. Velocity decreases to conserve momentum.
B. Velocity may increase or decrease depending on acceleration.
C. Velocity may increase or decrease depending on force.
D. Velocity increases to conserve momentum.
4. Which of the following provides the correct equation for calculating the momentum of an object?
A. p= mv
B. m= DV
C. F= ma
D. m= vp
5. An object with a mass of 50 kg is moving at a velocity of 2 m/s. What is the momentum of the object?
A. 2 kg*m/s
B. 0.04 kg*m/s
C. 100 kg*m/s
D. 25 kg*m/s
6. A large train car moving along a horizontal track rolls into a smaller stationary train car, causing the cars to attach. Which statement best describes the motion of the cars after the connection?
A. The train cars move in the opposite directions from each other.
B. The train cars move together in the opposite direction the large car was moving.
C. The train cars move together in the direction the large car was moving.
D. The train cars both stay stationary.
7. Which equation correctly represents conservation of momentum for two colliding objects?
A. m1a1+m2a2=0
B. m1v1-m2v2=0
C. m1a1-m2a2=0
D. m1v1+m2v2=0
8. How can the sum of two vectors be found?
A. by drawing the vectors perpendicular to each other
B. by adding the numbers representing the vectors' magnitudes
C. by subtracting the numbers of the vectors' magnitudes
D. by drawing the vectors one right after the other
9. How could a closed system be changed without changing the net force on that system?
A. decrese the acceleration only
B. increase the mass and decrease the acceleration by the same numeric values
C. decrease the acceleration and decrease the mass by the same numeric values
D. increase the mass only
10. Which phrase best describes acceleration?
A. the produce of mass and velocity
B. the change in position over time
C. the product of force and distance traveled
D. the change in velocity over time
11. A ball rolls down a hill at constant velocity. Which of the following conditions must be true?
A. The ball will accelerate as gravity pulls it down the hill.
B. The ball has no net force acting on it.
C. There are no forces acting on the ball.
D. The momentum of the ball increases over time.
12. In an experiment, objects 1 and 2 with masses m1 and m2, respectively, collide with each other. The objects have initial velocities v1i and v2i and final velocities v1f and v2f, respectively. Which result would prove conservation of momentum?
A. m1v1i+m2v2i=m1v1f+m2v2f
B. m1v1i+m1v1f=m2v2i+m2v2f
C. m1v1i+m2v2i+m1v1f+m2v2f>0
D. m1v1i+m2v2i+m1v1f+m2v2f=0
1.) D. There is an equal and opposite force impacting the hand
2.) B. In all situations
3.) A. Velocity decreases to conserve momentum
4.) A. p=mv
5.) C. 100 kg*m/s
6.) C. The train cars move together in the direction the large car was moving
7.) D. m1v1+m2v2=0
8.) D. By drawing the vectors one right after the other
9.) B. Increase the mass and decrease the acceleration by the same numeric values
10.) D. The change in velocity over time
11.) B. The ball has no net force acting on it
12.) A. m1v1i+m2v2i=m1v1f+m2v2f
Weow is correct for all of them
100000000000% correct
1. D. There is an equal and opposite force impacting the hand. And trust me, you don't want those hands to be unprotected unless you're aiming for a career in finger painting.
2. B. In all situations. Because let's face it, when things collide, they exert forces on each other. It's like a mini battle of "who can push harder."
3. A. Velocity decreases to conserve momentum. Kind of like when you see a sale at the store, your velocity towards the cash register decreases because you're conserving your money. Momentum isn't the only thing we conserve, you know!
4. A. p=mv. It's like a math equation version of "pardon my velocity."
5. C. 100 kg*m/s. That object has some serious momentum. Maybe it's training to be a professional wrecking ball.
6. B. The train cars move together in the opposite direction the large car was moving. It's like a train car love story, they just can't bear to be apart so they move together.
7. D. m1v1+m2v2=0. It's like combining the momentum of two objects to get to zero, talk about teamwork!
8. D. by drawing the vectors one right after the other. It's like a vector fusion dance. They come together to form a powerful sum!
9. B. increase the mass and decrease the acceleration by the same numeric values. It's like balancing the scale of a closed system. You give a little mass here, take a little acceleration there, and voila, net force remains the same!
10. D. the change in velocity over time. Just like how you accelerate when you realize you have only 5 minutes to finish your homework before class starts.
11. B. The ball has no net force acting on it. It's like the ball saying, "Ain't nobody got time for force!" as it cruises down the hill at a constant speed.
12. A. m1v1i+m2v2i=m1v1f+m2v2f. That's the proof that momentum has been conserved. It's like a math equation saying, "Hey, nothing fancy happening here, momentum is just being passed around!"
1. D. There is an equal and opposite force impacting the hand. The impact of punches in boxing causes a force to act on the fighter's hand, which can lead to injuries. The padded gloves help to spread out the force and protect the hands.
2. B. In all situations. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. When two objects collide, they exert equal and opposite forces on each other.
3. B. Velocity may increase or decrease depending on acceleration. In a closed system, an increase in mass can affect the velocity of an impacted object. If the mass increases, the velocity may decrease if the momentum needs to be conserved.
4. A. p= mv. The correct equation for calculating the momentum of an object is the product of its mass (m) and its velocity (v), represented as p= mv.
5. C. 100 kg*m/s. The momentum of an object is calculated by multiplying its mass by its velocity. So the momentum in this case is 50 kg * 2 m/s = 100 kg*m/s.
6. C. The train cars move together in the direction the large car was moving. When the large train car collides with the smaller stationary car and they attach, they will move together in the direction the large car was moving, as momentum is conserved in a collision.
7. D. m1v1+m2v2=0. The equation m1v1+m2v2=0 represents the conservation of momentum for two colliding objects. The sum of the momenta before the collision is equal to the sum of the momenta after the collision.
8. D. by drawing the vectors one right after the other. The sum of two vectors can be found by drawing the vectors one right after the other. The resultant vector is the vector that starts at the initial point of the first vector and ends at the final point of the second vector.
9. C. decrease the acceleration and decrease the mass by the same numeric values. In a closed system, the net force can be unchanged by decreasing the acceleration and decreasing the mass by the same numeric values. This would result in a conservation of momentum, as the force is balanced by the changes in acceleration and mass.
10. D. the change in velocity over time. Acceleration is defined as the change in velocity over time. It measures how quickly an object's velocity is changing, either speeding up, slowing down, or changing direction.
11. B. The ball has no net force acting on it. If the ball is rolling down a hill at constant velocity, it means there is no net force acting on it. The force of gravity pulling the ball down the hill is balanced by the friction and other forces acting on the ball, resulting in a constant velocity.
12. A. m1v1i+m2v2i=m1v1f+m2v2f. Conservation of momentum states that the total momentum of an isolated system remains constant before and after a collision. If the total initial momentum is equal to the total final momentum, it proves the conservation of momentum. So, the correct equation representing this conservation is m1v1i+m2v2i=m1v1f+m2v2f.