AQA A level Physics
Mechanics Exam
Questions with Answers
Explain what is meant by an inelastic collision - Answer>>
where kinetic energy is not conserved
State, in words, the relationship between the force acting on a
body and the momentum of the body - Answer>> Force is the
rate of change of momentum
State two quantities that are conserved in an elastic collision -
Answer>> -momentum
-kinetic energy
Use Newton's laws of motion to explain how the molecules of a
gas exert a force on the wall of a container - Answer>> -force is
exerted on molecule by wall
-to change its momentum
- molecule must exert an equal but opposite force on wall
-in accordance with Newton's second or third law
An apple and a leaf fall from a tree at the same instant. Both
apple and leaf start at the same height above the ground but the
apple hits the ground first. use newton's laws to explain why the
leaf accelerates at first then reaches a terminal velocity. -
Answer>> -Newton's second law stares that F=ma
-As there is a large weight and little air resistance at first, there is
a large acceleration
-As the weight begins to get balanced out by the air resistance,
the resultant force decreases which means that acceleration
decreases
