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A-level AQA Physics > 03 Dynamics > Flashcards

03 Dynamics Flashcards

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1
Q

What are the 4 forces in nature?

A

-strong nuclear force
-weak nuclear force
-electromagnetic force
‐gravitational force

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2
Q

Put the 4 forces in nature in order from strongest to weakest?

A

strongest
Strong nuclear force
Weak nuclear force
Electromagnetic force
Gravitational force
Weakest

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3
Q

What does strong nuclear force (SNF) do?

A

Binds the nucleus

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4
Q

What does Weak nuclear force do?

A

Changes quark flavour

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5
Q

What does Electromagnetic force do?

A

Force binds atoms

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6
Q

What does gravitational force do?

A

Binds the solar system

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7
Q

Which of the forces in nature prevents the nuclei from collapsing?

A

Strong nuclear force

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8
Q

Which of the forces in nature binds neutrons together in the nucleus?

A

Strong nuclear force

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9
Q

Which of the forces in nature binds protons together in the nucleus?

A

Strong nuclear force

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10
Q

Which of the forces in nature keeps electrons orbiting the nucleus?

A

Electromagnetic force

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11
Q

Which of the forces in nature causes the normal contact force?

A

Electromagnetic force

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12
Q

Which of the forces in nature causes drag?

A

Electromagnetic force

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13
Q

Which of the forces in nature causes air resistance?

A

Electromagnetic force

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14
Q

Which of the forces in nature causes beta radiation?

A

Weak nuclear force

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15
Q

Which of the forces in nature red-giant stars to collapse?

A

Gravitational force

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16
Q

Which of the forces in nature changes quark flavour?

A

Weak nuclear force

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17
Q

Which of the forces of nature keeps the earth orbiting the sun?

A

Gravitational force

18
Q

What is force measured in?

A

Newton’s (N)

19
Q

What is the definition of a Newton?

A

A force of one Newton gives a mass of 1 kg and an acceleration of 1 m s‐²

20
Q

What is weight equal to?

A

Weight=force of gravity=mg

21
Q

What is the definition of gravitational field strength?

A

The force due to gravity on a mass of 1 kilogram.

22
Q

What are the units for gravitational field strength?

A

m s‐²
N kg‐¹

23
Q

What is mg?

A

Force of gravity

24
Q

How do you lable an objects weight on a diagram?

A

With a downward arrow from the centre of mass labelled ‘mg’.

25
Q

In which direction does friction happen?

A

In the opposite direction to the motion of the object.

26
Q

When does friction decrease?

A

When the 2 surfaces are made smoother and the weight of the object decreases.

27
Q

When does friction increase?

A

When the 2 surfaces are made rougher and the weight of the object increases.

28
Q

What are frictional forces acting on an object moving through a gas or liquid also known as?

A

Fluid friction, drag and air resistance.

29
Q

What does normal mean?

A

Perpendicular

30
Q

At what angle does the normal contact force act?

A

At 90° (perpendicular) to the surfaces in contact.

31
Q

What is normal contact force?

A

A force acting perpendicular to a surface.

32
Q

What type of diagram shows the forces acting on a car?

A

A free body diagram

33
Q

What is the resultant force?

A

The overall or net effect of all the forces of an object.

34
Q

What does newton’s 1st law of motion state?

A

An object remains at rest or continues with constant velocity unless acted upon by a resultant force.

35
Q

If opposite arrows on a free body diagram are the same length how do you describe them?

A

Equal and opposite.

36
Q

In a free body diagram if the arrows are equal and opposite, what is the resultant force?

A

0N

37
Q

If the resultant force is 0N what is concluded about the speed?

A

It is constant / no acceleration

38
Q

What does newton’s 2nd law of motion state?

A

An objects acceleration is directly proportional to the resultant force acting on the object and inversely proportional to its mass (f = ma)

39
Q

What does newton’s 3rd law state?

A

If body A exerts a force on a body B then body B exerts and equal but opposite force on body A.

40
Q

What is the criteria for Newtons 3rd law forces?

A
  1. Be equal in magnitude
  2. Act along the same line of action
  3. Be forces of the same kind
  4. Act in opposite directions.
41
Q

What is terminal velocity?

A

The maximum velocity achieved when there is no resultant force acting on a falling body

A-level AQA Physics (8 decks)

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