9 -2

http://twyfordigcsephysics.blogspot.co.uk/2012/12/investigating-newton-2.html

http://twyfordigcsephysics.blogspot.co.uk/2012/12/experimental-results.html

9-1

http://twyfordigcsephysics.blogspot.co.uk/2012/12/investigating-newton-2.html

http://twyfordigcsephysics.blogspot.co.uk/2012/12/experimental-results.html

9-1

Lesson notes at the end of this post

http://twyfordigcsephysics.blogspot.co.uk/2012/11/blog-post.html

Answers to calculations on force

1. 1.       F= ma = 2000 x 3 = 6000 N
2. 2.       F= ma = 90 x (-4) = -360 N
3. 3.       F= ma = 0.05 x (-60) = -3 N
4. 4.       F = ma = 10 000 000 kg x 10 = 100 000 000 N = 1 x 10⁸ N
5. 5.       F = ma = 70 x (-14) =- 980 N
6. 6.       F= ma = 1000 x (-50) =- 50 000 N
7. 7.       F = ma = 0.1kg x 5 = 0.5 N

1a           -2.5m/s²                                         b             -2500N

2a           5m/s²                                    b             450 N

3a           0.25m/s²              `                 b             3N

4a           - 1500 m/s²                            b             -30 N

5              500kg

6              10m/s²

7              a = - 3m/s                                          -2250 N