Levers

http://twyfordigcsephysics.blogspot.co.uk/2013/03/the-lever.html

February Assessment

http://twyfordigcsephysics.blogspot.co.uk/2013/02/february-assessment.html

Momentum and car safety

http://twyfordigcsephysics.blogspot.co.uk/2013/02/momentum-and-car-safety.html

Forces on a Plane

Collisions

1.       A truck of mass 2kg travels at 8 m/s towards a stationary truck of mass 6kg. After the collision they stuck together and move off in the same direction. What is their common velocity?

2.       A car of mass 2000kg, traveling at 10m/s, has a head on collision with a small sports car of mass 500kg. If both cars stop dead on colliding, what was the velocity of the sports car before the collision?

3.       A man wearing a bullet proof vest stands on roller skates. His total mass is 80kg. A bullet of mass 20g is fired at him at a speed of 400 m/s. If the bullet is stopped by the vest and falls to the ground, what velocity will the man move at? How does your answer compare with “the movies”?