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Mechanics · Part 1 of 4
6 exam-style questions with model answers, plus 6 quick multi-choice questions — every question on this part of the standard, grouped by the 2 pages of notes they come from.
Write a full answer before you reveal the model one. That comparison is where the learning happens.
Two masses lie on a line: kg at and kg at m.
Show that the centre of mass is at m.
A kg mass at m and a kg mass at m sit on a rod.
Calculate the position of the centre of mass.
An astronaut ( kg) and a tool bag ( kg) float at rest in deep space, m apart. The astronaut pulls the bag in until they meet.
Explain where they meet, and why, using the centre of mass.
A kg ball moving east at m s−1 is struck and moves north at m s−1.
Show that the magnitude of its change in momentum is kg m s−1.
A kg trolley moving east at m s−1 collides with a stationary kg trolley and they stick together.
Calculate their common speed.
A kg object at rest explodes into two pieces. A kg piece flies east at m s−1.
Determine the velocity of the kg piece, and explain why kinetic energy is not conserved here.