In the following diagram, the greem ball changes direction after colliding with the red ball because the red ball has more momentum.
True <----
False
2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s.
4.00 kg m/s
20.0 kg m/s
25.0 kg m/s
100 kg m/s <----
3. Which of the following describes the relationship between friction and inertia?
When there is more friction, there is less inertia
When there is less friction, there is more inertia
When there is more friction, there is more inertia <----
When there is no friction,there is more inertia
4. Jellyfish sometimes squeeze in the sides of their bodies. This pushes a stream of water from the back end of their bodies. According to Newton's third law of motion, how will this behavior affect the movement of the jellyish?
The jellyfish will move forward
The inertia of the jellyfish will increase <----
the Jellyfish will move backward
The jellyfish will stay still.
5. Which of the following would have less momentum than a 52 kg cheetah at 10 m/s
a 71 kg lion running at 10 m/s
a 45 kg zebra running at 13 m/s <---
a 5,000 kg elephant walking at 1 m/s
a 61 kg zebra running at 8.0 m/s
6. According to Newton's third law of motion, if a rolling ball collides with a wall and exerts a force of 3N on that wall, how much force does the wall excert back on the ball.
0 N
3 N <---
6 N
9 N
7. After an avalanche, a huge block of stone slid down a mountain and landed in the middle of a road. People in the nearby town had a very difficult time moving it out of the road. The block of stone is difficult to move because
it has a high amount of momentum
has balanced forces acting on it
it has a high amount o inertia
has unbalanced forces acting on it <---
8. Which of the following statements is true about a collison between two cars?
The total momentum after the collision is the same as the total momentum befor the collision
The total momentum after the collision is greater than the total momentum beforethe collision <---
The total momentum after the collision is less than the total momentum before the collision
The total momentum after the collision is zero.
1. True
2. 100kg-m/s.
5. Momentum = 52kg * 10m/s. = 520 kg-m/s
61kg * 8m/s = 488 kg-m/s
1. Is false, READ THE LAST PART CAREFULLY. the green ball does not change direction because the RED BALL HAS MORE MOMENTUM. why would the red ball have more momentum???
you made me fail my test
@Keshaundriel, He didn't make you fail anything, you chose to use his answers.
To answer the questions:
1. The statement "the green ball changes direction after colliding with the red ball because the red ball has more momentum" is FALSE. The direction change of the green ball after colliding with the red ball is due to the conservation of momentum and the principle of equal and opposite reaction, not because the red ball has more momentum.
2. To calculate momentum, you can use the equation, momentum = mass × velocity. For the given scooter with a mass of 20.0 kg and a velocity of 5.00 m/s, the momentum will be 20.0 kg × 5.00 m/s = 100 kg m/s.
3. The correct relationship between friction and inertia is: When there is more friction, there is more inertia. Friction tends to resist motion, so when there is more friction, it takes more force to overcome that resistance, which results in more inertia.
4. According to Newton's third law of motion, if a jellyfish squeezes in the sides of their bodies, pushing a stream of water from the back end, the behavior will affect the movement of the jellyfish by increasing its inertia. This is because the action of squeezing and expelling water in one direction causes an equal and opposite reaction, pushing the jellyfish in the opposite direction and increasing its inertia.
5. To determine which object has less momentum than a 52 kg cheetah at 10 m/s, you need to calculate the momentum for each option. The momentum of an object is calculated using the equation momentum = mass × velocity. Comparing the options, a 45 kg zebra running at 13 m/s will have less momentum than a 52 kg cheetah at 10 m/s.
6. According to Newton's third law of motion, the force exerted by the wall on the rolling ball will be equal in magnitude and opposite in direction to the force exerted by the ball on the wall. Therefore, if the ball exerts a force of 3N on the wall, the wall will exert a force of 3N back on the ball.
7. The block of stone is difficult to move because it has a high amount of inertia. Inertia is the resistance of an object to changes in its motion, and a large block of stone would have a high mass, leading to a high amount of inertia. The difficulty in moving the stone is due to the large force needed to overcome its inertia.
8. The correct statement about a collision between two cars is: The total momentum after the collision is greater than the total momentum before the collision. This is because, in a collision, momentum is conserved, and if the cars were originally moving in opposite directions, their combined momentum after the collision will be the vector sum of their individual momenta, resulting in a greater total momentum.