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
-When the acceleration is constant, it has reached terminal
velocity
Galileo used an inclined plane to investigate the motion of falling
objects. Explain why using an inclined plane rather than free fall
would produce data which is valid. - Answer>> -Free fall is too
quick
-No reliable method to time free fall
State two vector quantities - Answer>> -Velocity
-acceleration
-force
State two scalar quantities - Answer>> -speed
-distance
-mass
State the difference between a scalar quantity and a vector
quantity - Answer>> Vector quantities have both magnitude and
direction but scalar quantities only have magnitude
Explain what is meant by centre of gravity - Answer>> The point
at which the mass of the system can be considered to be
concentrated
Define the moment of a force - Answer>> moment=force x
perpendicular distance
State the Principle of moments - Answer>> Sum of clockwise
moments = sum of anti-clockwise moments
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
-When the acceleration is constant, it has reached terminal
velocity
Galileo used an inclined plane to investigate the motion of falling
objects. Explain why using an inclined plane rather than free fall
would produce data which is valid. - Answer>> -Free fall is too
quick
-No reliable method to time free fall
State two vector quantities - Answer>> -Velocity
-acceleration
-force
State two scalar quantities - Answer>> -speed
-distance
-mass
State the difference between a scalar quantity and a vector
quantity - Answer>> Vector quantities have both magnitude and
direction but scalar quantities only have magnitude
Explain what is meant by centre of gravity - Answer>> The point
at which the mass of the system can be considered to be
concentrated
Define the moment of a force - Answer>> moment=force x
perpendicular distance
State the Principle of moments - Answer>> Sum of clockwise
moments = sum of anti-clockwise moments
