1. In the following diagram, the green 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 jellyfish?
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 excerpt 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 collision between two cars?
The total momentum after the collision is the same as the total momentum before the collision
The total momentum after the collision is greater than the total momentum before the collision <--
The total momentum after the collision is less than the total momentum before the collision
The total momentum after the collision is zero.
i know 1 -3 is right but i don't know the rest, is this connections academy?
Yea some of it is Connexus
Here are the explanations for each question:
1. False: The direction change of the green ball after colliding with the red ball is due to the conservation of momentum. When two objects collide and transfer momentum, the total momentum before the collision is equal to the total momentum after the collision. The direction change occurs because both balls experience an equal and opposite change in momentum.
2. The momentum of an object is calculated by multiplying its mass by its velocity. So, the momentum of the 20.0 kg scooter traveling at 5.00 m/s would be: 20.0 kg * 5.00 m/s = 100 kg m/s
3. The correct statement is: When there is more friction, there is more inertia. Friction is a force that resists the motion of objects. Inertia is the tendency of an object to resist changes in its motion. When there is more friction, it acts as a resistance to the motion of an object, making it harder to overcome inertia and change its state of motion.
4. The correct answer is: The inertia of the jellyfish will increase. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. When the jellyfish squeezes its body and pushes a stream of water, the water exerts a reaction force on the jellyfish, pushing it forward due to the conservation of momentum.
5. The correct answer is: a 45 kg zebra running at 13 m/s. Momentum is calculated by multiplying mass and velocity. The momentum of an object is directly proportional to both mass and velocity. A lower mass or lower velocity will result in lower momentum. In this case, the 45 kg zebra running at 13 m/s will have less momentum than the 52 kg cheetah at 10 m/s.
6. According to Newton's third law of motion, the force exerted by the wall on the ball will be equal in magnitude and opposite in direction to the force exerted by the ball on the wall. So the force exerted by the wall on the ball would be 3 N.
7. The block of stone is difficult to move because it has a high amount of inertia. Inertia is the tendency of an object to resist changes in its state of motion. The block of stone sliding down the mountain and landing on the road accumulated a significant amount of momentum. Moving it requires overcoming the inertia associated with its large mass and the velocity it gained during the avalanche.
8. The correct statement is: The total momentum after the collision is the same as the total momentum before the collision. According to the law of conservation of momentum, the total momentum of an isolated system remains constant before and after a collision, assuming there are no external forces acting on the system. This means that the total momentum of the two cars before the collision will be equal to the total momentum of the two cars after the collision.