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Chapter 6 Review Questions

- Chapter 13 contains answers and explanations.

- While a person lifts a book of mass from the floor to a table, how much work does the force do?
- A block of mass 3.5 kg slides down a plane of length 6.4 m that makes an angle of 30 degrees with the horizontal.

- A rock is dropped from the top of a crater on the Moon.

- A force of 200 N is needed to keep an object sliding across a rough floor.

- The horizontal surface from Point B to C is different from the slide.

- The question was posed in part.

- A student uses a camera and computer to take pictures of a ball as it slides down a track.
- The initial release point is 1.5 meters above the ground.
- He tries to analyze the data he prints.

- A car with an initial speed of 10 m/s is travelling with a mass of 800 kilograms.

- Work is applied to a displacement.
- A change in energy can be caused by work.
- Positive work takes energy out of a system, while negative work takes energy in.

- The total initial energy is the same as the total final energy.

- We limit ourselves to mechanical energy with no heat lost or gained.

- We discovered the nature of objects, the reason why objects move, and the energy required to make objects move.

- We will predict the nature of objects when they interact with other objects.

- A pool stick hitting the cue ball, a car collision, and the Death Star exploding--physics is about the interaction of objects.
- A collision is an interaction between two objects.
- It will prove to be quite a challenge if we use the Second Law.
- The forces that occur during a car collision are unimaginably complex, and sometimes they move away from each other, sometimes they move in the same direction, and sometimes the objects stick together.
- We would get different results if we measured their speeds before and after the collision.
- We were able to predict that the smaller car would have the greater speed in the end because of our understanding of the Second Law.

- It is proportional to the force impressed.

- There isn't a special term for this unit.

- The same change in linear momentum can be produced by a large force acting for a short period of time.

- The direction and magnitude of a vector are important.
- In collision problems, be aware of orientation and assign negative values to negative velocities and positive values to positive velocities.

- The time of impact between the golf club and the ball is 1 ms.
- The average force on the ball should be calculated if the ball acquires a velocity of 70 m/s.

- It's important to remember that momentum and Kinetic Energy are not the same thing.

- Changes in motion are resisted by objects.
- In order to change an object's speed or direction, we need to exert some kind of force over a period of time.

- Change in linear momentum is equal to the change in impulse.

- A force-versus-time graph can be used to find the impulse delivered to an object.

- The impulse that is delivered on an object can change its momentum.
- The collision's effect on the momentum is the same as the collision's effect on the momentum before it.

- A football team's kicker punts the ball with a launch speed of 30 m/s.
- The average force by the kicker on the ball is 8 ms, so find the impulse delivered to the football by the kicker's foot.

- A stuntman is jumping out of a window that is 45 m above the ground.

- The forces are acting in the opposite direction of motion and will cause the object to slow down.

- Increasing the slowing-down time reduces the force that can cause injury.
- The purpose of air bags in cars is this.

- Under curved graphs, calculus is needed to find the true area.
- The AP physics 1 exam doesn't require you to know math.
- Basic shapes you have studied before can be used to approximate areas under graphs.

- When one object exerts force on another object, the second object exerts force on the first.
- When two objects interact with each other, the Third Law is combined with the Second Law.

- If we combine the laws and interpret them in terms of momentum, we can say that two interacting objects experience equal but opposite momentum changes.

- The cord that was supposed to attach the astronauts to the ship has become disconnected as she is floating in space.
- Her total mass is 91 kilograms.
- She reaches into her pocket, finds a metal tool and throws it out into space with a speed of 9 m/s away from the ship.

- The system is made up of the tool and the astronauts.

- Two balls are rolling.
- The red ball has a mass of less than 1 kilo and a speed of 4 m/s just before impact.
- The green ball has a mass of 0.2 kg and a speed of 2 m/s.
- The red ball goes forward with a speed of 2 m/s after the head-on collision.

- The direction of the velocity is important because momentum is a vector quantity.
- One ball has a positive velocity while the other has a negative one.
- Let's call the red ball's speed before it collides with something.

- There is a movement.
- If you set an object going to the right as positive momentum, you must also set an object going to the left as negative.

- When a heavier object collides with a lighter object, the green ball's speed is reversed.
- We need to compare the total energy before and after the collision to see if it was elastic.

- All crashes conserve energy.
- In order to determine if the collision was elastic or inelastic, we need to know if the energy was lost.

- The collision was inelastic if the kinetic energy was lost.

- There are a lot of calories at the beginning.

- There is less energy at the end compared to the beginning.

- The collision was inelastic.
- The two objects are slightly warmer after the collision because most of the lost energy was transferred as heat.

- Two balls are rolling.
- The red ball has a mass of less than 1 kilo and a speed of 4 m/s just before impact.
- The green ball has a mass and a speed of 2 m/s.
- If the collision is inelastic, you can determine the speed of the object after the collision.

- The mass sticks together after impact if the collision is completely inelastic.

- A car is travelling 20 m/s due north.
- It hits a car at 30 m/s.
- The bumpers of the cars are locked.

- The problem shows the nature of numbers.

- The final momentum is the result of the two vectors.

- We are not done yet because we know that velocity has a magnitude of 18 m/s and a direction.
- Most of the AP Physics 1 Exam is in degrees.

- Adding these equations eliminates the problem.

- We can determine if the collision is elastic by Substituting this result into Equation (2).

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