Chapter 8 Review Questions

1.)work, it changes the amount of power used

2.)3 times the work

3.)they are the same

4.)1000J

5.)200W & 100W

6.)potential and kinetic energy

7a.)100J

b) 200J becausze it's twice the height as A

8.)200J

9.)4000J & 6000J

10.) 50J

11.)It means that energy will always be the same no matter how you change it

12.)

13.)Because it is like a machine that transforms chemical energy stored in fuel into mechanical energy

14.)Levers and pulleys are machines that can alter the input force

15.)We put force on one end and it is makes the other end do the opposite

16.)That the ratio outout force is compared to the input force of a machine

17.)type 2

18.) effiency = 0.35J

Chapter 7 Review Questions

1. Mass is  the amount of space an objects takes up and momentum is  inertia in motion

2a.The heavy truck has a greater mass

2b.The skateboard would have a greater momentum

3.I mpact is when the object hits something and impulse  is the quantity force X time interval

4.It increases

5. momentum is mass X the velocity and impulse us the change in that momentum. impulse is Force X Time and momentum is inertia on motion

6.Its the change in the momentum

7a. The impulse would double also

7b. It would also double

8.Than the momentum forced on the occupant would be less

9.It would decrease by four times

10.If he did not roll with the punches the impulse applied on him would be greater. if he in to the oncoming punch the time would be shortened and the impulse would be greater

11a. Yes

11b.Yes

11c. The impulse of u throwing the ball would be greater.

12.Because the  bouncing applies more force back

13. The curved blades cause the water to bounce and make a U-turn producing a large impulse that turns the wheel

14.The force on the bullet inside the rifle barrel is equal and opposite to the force causing the rifle to recoil

15.the object holds in the force applied on it

16. Elastic collision- when objects collide without being permanently deformed and without generated heat
    Inelastic collision- whenever colliding objects become tangled or couple together.

17. 2 km/h

18.No

chapter 7 plug and chug

1a. 16 m/s(squared)

b. 16 m/s(squared)

c.16 m/s(squared)

2a. 200 m/s(squared)

b. 200 m/s(squared)

3a. 11

b. 11m/s(squared

c.IDK

4a. 4m/s

b. 2m/s