Topic 2 Mechanics

Question 1

Projectile motion

Answer 1

Horizontal and vertical motion are independent of each other

Question 2

Elastic collision

Answer 2

A collision in which momentum and kinetic energy are conserved

Question 3

Inelastic collision

Answer 3

A collision in which momentum is conserved but kinetic energy is not.
(The colliding objects may stick together after the collision)

Question 4

Law of conservational of momentum

Answer 4

If no external forces are acting/ in an isolated system, momentum is constant/ momentum before=momentum after

Question 5

Acceleration from velocity time graph

Answer 5

Gradient

Question 6

Velocity from displacement time graph

Answer 6

Gradient

Question 7

Displacement from velocity time graph

Answer 7

Area under graph

Question 8

Newton’s first law

Answer 8

If all forces are balanced/ there is no resultant force, there will be no change in speed, direction and shape

Question 9

Instantaneous speed

Answer 9

The speed at a particular instant (as opposed to average speed, which is over a period of time)