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A Level-Physics > Module 3-Forces and Motion > Flashcards

Module 3-Forces and Motion Flashcards

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1
Q

What is displacement and how does it differ from distance

A

Distance is the ground covered regardless of the direction
Whereas displacement only account for the change in position
In relation to the starting point

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2
Q

What do you know about displacement time graphs

A

Displacement goes on the y
Time goes on the x
Velocity is the gradient

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3
Q

What do you know about velocity time graphs

A

Velocity goes on y
Time goes on x
Acceleration is gradient
Displacement is area under the graph

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4
Q

State the SUVAT equation that beggins with v^2

A

v^2=u^2+2as

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5
Q

What is the SUVAT equation that begins in v

A

v=u+at

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6
Q

1/2(u+v)t= what

A

s

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7
Q

SUVAT equation-S is equal to what (both)

A

S=ut+1/2at^2
S=vt-1/2at^2

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8
Q

What is the equation for stopping distance

A

Stopping distance=thinking distance+braking distance

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9
Q

How does an object reach it’s terminal velocity

A

An object in free fall will accelerate at first as the drag is smaller than the weight
However as the object speeds up, the drag increases at the same rate
This causes the forces of drag and weight to balance out
At which point the object will stay at a constant velocity as there are no net forces to change it.

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10
Q

What is the equation that links force mass and acceleration

A

Force = mass x acceleration

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11
Q

What is centre of mass

A

Centre of mass is an imaginary point where all of the mass can be considered to be at one point

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12
Q

What is centre of gravity

A

Centre of gravity is the point directly underneath the centre of mass where the whole weight acts upon

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13
Q

What is drag

A

Drag is the force experienced on an object moving through a fluid opposite to the direction of motion

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14
Q

What is the equation for a moment

A

Moment = perpendicular force x distance to pivot

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15
Q

What is a couple

A

A couple (of torques) is a pair of rotational forces that act on the same object together spinning it without overall movement e.g. two forces on bike pedals

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16
Q

What is the equation for pressure

A

Pressure = force / area

17
Q

What is the equation for density

A

Density = mass / volume

18
Q

What is the equation for pressure of a liquid

A

Pressure= height (column of liquid) x density x gravitational pull

19
Q

What is the equation linking work done force and distance

A

Work done = force x distance (in the direction of work)

20
Q

What is the principle of conservation of energy

A

Energy cannot be created nor destroyed

21
Q

What are the 8 types of energy

A

Kinetic
Gravitational potential
Electrical potential
Elastic potential
Chemical
Nuclear
Electromagnetic
Thermal (internal)

22
Q

Define power and state equation

A

Power is force applied in a short time and therefore the equation is power = work done / time

23
Q

What is the equation for efficiency

A

Efficiency = useful power output/total power input x 100%

24
Q

What is a tensile and compressive force

A

A force that pulls an object in two opposite ways (tensile)
A force that pushes an object towards its centre (compressive)

25
Q

What is the name given when an object changes shape and doesn’t return to its original form

A

Deformation

26
Q

What is elastic potential energy

A

It is the energy stored up in an object when it is stretched or squashed and wants to return to its original shape

27
Q

What is elastic and plastic deformation

A

Elastic deformation is when an object can change back to its original shape
Plastic deformation is when an object exceeds its elastic limit and cannot return to its original shape

28
Q

What is the equation for tensile stress

A

Tensile stress=force / area

29
Q

What is the equation for tensile strain

A

Tensile strain = extension / original length

30
Q

What is young modulus

A

Young modulus is the gradient of the stress vs strain graph and put simply is the stiffness of a material-the higher the young modulus the stiffer the material will be

31
Q

Does young modulus change with size, shape or width

A

None! Young modulus of an object is only dependent on the material itself

32
Q

What is Newton’s first law of motion

A

An object will remain at rest or continue at a constant velocity as long as no resultant force acts upon it

33
Q

What is Newton’s second law

A

The resultant force acting on an object is proportional to the rate of change of momentum

34
Q

What is Newton’s third law

A

If object A exerts a force on object B, object B will exert an equal and opposite force on object A and the forces are the same type and in the same line of motion

35
Q

What is the significance of change of momentum when relating to force

A

The faster the change in momentum occurs, the larger the force.

36
Q

What is an impulse

A

An impulse is the change in momentum for example you experience a high impulse when going on a rollercoaster

37
Q

What are two quantities that are conserved in all collisions

A

Energy
Linear momentum

38
Q

What is the UTS of a material

A

The max amount of tensile stress it can take before it breaks

A Level-Physics (8 decks)

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