Page 143 6-19
6. It is kind of resistance force when we spin something.
7.the length of lever
8.Yes. It depends on the mass and the distance to the mass center.
9.Along the lead< at the right angles to the lead at the middle< at right angles to the lead at one end.
10. a baseball bat held at the end (not massive end)
11. Because it decrease the distance from our mass center to the point we providing force, so the inertia is less.
12. Solid disk.
13. a torque tend to rotate an object
14. the distance from the force to the mass center.
15. the torque of clockwise is equal to the counterclockwise torque to keep equilibrium.
16. It will wobble around the center of gravity.
17. the mass center is in the center of a baseball and the center gravity is at the button of the baseball. The mass center of baseball bat is near the heavier part.
18.
19. at the center of soccer ball.
Page 144 :25,26
25. No force because newton first law
26.There is no force applied to me, because the car has centripetal applied to the car which make me slide across the seat.
page 145: 1-4
1. 50N*0.2m=10N/m
2. 50*0.5m=25N/m
3. (2kg*9m/s)/2.5m=7.2N
4. (75kg*9m/s)/2m=337.5N
Page 149
1. The base will go faster, 3/2 faster than the mouth.
2. (a) 80N*0.25m=20N
(b) 0.1m*F=80N*0.25m
F=200N
3. 0.25m*Rock Mass= 1kg*0.75m
Rock Mass=3kg
4. 1kg*0.5m=0.5N
1kg*0.75m=0.75N
1kg* 1m=1N
6. It is kind of resistance force when we spin something.
7.the length of lever
8.Yes. It depends on the mass and the distance to the mass center.
9.Along the lead< at the right angles to the lead at the middle< at right angles to the lead at one end.
10. a baseball bat held at the end (not massive end)
11. Because it decrease the distance from our mass center to the point we providing force, so the inertia is less.
12. Solid disk.
13. a torque tend to rotate an object
14. the distance from the force to the mass center.
15. the torque of clockwise is equal to the counterclockwise torque to keep equilibrium.
16. It will wobble around the center of gravity.
17. the mass center is in the center of a baseball and the center gravity is at the button of the baseball. The mass center of baseball bat is near the heavier part.
18.
19. at the center of soccer ball.
Page 144 :25,26
25. No force because newton first law
26.There is no force applied to me, because the car has centripetal applied to the car which make me slide across the seat.
page 145: 1-4
1. 50N*0.2m=10N/m
2. 50*0.5m=25N/m
3. (2kg*9m/s)/2.5m=7.2N
4. (75kg*9m/s)/2m=337.5N
Page 149
1. The base will go faster, 3/2 faster than the mouth.
2. (a) 80N*0.25m=20N
(b) 0.1m*F=80N*0.25m
F=200N
3. 0.25m*Rock Mass= 1kg*0.75m
Rock Mass=3kg
4. 1kg*0.5m=0.5N
1kg*0.75m=0.75N
1kg* 1m=1N