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Physics > Kinematics > Flashcards

Kinematics Flashcards

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1
Q

Define speed.

A

The rate at which is distance is travel over a period of time

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2
Q

Define Displacement.

A

The change of position of an object, taken in a straight line including direction

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3
Q

The position of an object is

A

Described relative to a reference point.

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4
Q

Define distance.

A

The length of the path taken. No direction.

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5
Q

Scalar is?

A

Quantities with magnitude only

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6
Q

Vectors have?

A

Magnitude and direction

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7
Q

Velocity is?

A

The change in displacement of an object over a period of time.

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8
Q

Acceleration is?

A

The rate of change to the velocity of an object.

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9
Q

Objects thrown at a slow to moderate speed make a?

A

Parabolic arch through the air

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10
Q

Force is?

A

Any push or pull on an object

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11
Q

F=?

A

ma

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12
Q

4 fundamental forces?

A

Strong
Weak
Electro magnetic
Gravity

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13
Q

Types of forces?

A 
Tension
Compression
Friction
Normal
Gravitational
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14
Q

Units of force?

A

N

Kg m/s²

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15
Q

Newton’s first law?

A

An object will remain in its state or motion or rest until acted upon by a non-zero net force

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16
Q

Newton’s second law?

A

A non zero net force acting on an object will cause it to accelerate. The acceleration is directly proportional to the net force acting on it and inversely proportional to its mass. a=F/m

17
Q

Newton’s third law?

A

For every action there is an equal and opposite reaction.

Whenever one object exerts force on a second object, the second object exerts and equal and opposite force on the first.

18
Q

What is friction?

A

The force between two surfaces preventing them from sliding past eachother. Solids, liquids or gasses

19
Q

What is the cause of friction?

A

Inter molecular forces between the atoms and molecules of the two surfaces.

20
Q

Amount of friction depends on what 2 elements?

A

The magnitude of the forces acting on eachother and the nature of the surfaces.

21
Q

The coefficient of friction is

A

The constant of proportionality between the force of friction and the normal force of the surface. Ff = u Fn

22
Q

2 types of friction?

A

Static

Kinetic

23
Q

Newton’s law of universal gravitation?

A

Gravitational force is directly proportional to the product of the 2 masses and inversely proportional to the square of the distance between them. Fg = G (m1 m2)/r²

24
Q

G = ?

A

Universal gravitational constant.

6.67 x 10-¹¹ N m² / kg²

25
Q

Cavendish experiment was

A

2 masses attached to a thin metal rod suspended by a wire. 3rd mass brought close. The force of gravity causes the apparatus to twist. The twist in the wire is then converted to force.

26
Q

Torsion balance is

A

An instrument used to measure small forces.

27
Q

Explain gravitational fields

A

A sphere of influence around a mass in which an other mass will feel it’s gravitational force. A vector field in the direction of center mass. g = Gm/r²

28
Q

Strongest gravitational force on earth is at?…… Why?

A

At the poles.
They are closer to center mass.
The rotation of earth causes a force perpendicular to its gravitational field.

29
Q

Uniform motion is

A

Consistent change of position in one direction

Consistent velocity.

30
Q

Uniform acceleration is

A

Consistent change in velocity in one direction.

Consistent acceleration.

31
Q

What is the formula for acceleration given Vf, Vi and t

A

a = (Vf-Vi)/t

32
Q

Formula for distance, not given time

A

d = (Vf²-Vi²)/2a

33
Q

Force of gravity on a slope
F-applied =
F-normal =
F-gravity =

A

Sine ø
Cos ø
Tan ø or 9.81m/s² x kg

34
Q

Force of Friction equation

A

(F-normal) x (ü) = Ff

(F-applied) - (Fnet) = Ff

35
Q

Mass of earth

A

5.98 x 10²⁴ kg

36
Q

Radius of earth at its surface

A

6.37 x 10^6 m

37
Q

G =

A

G = 6.67 x 10-¹¹ N m²/kg²

38
Q

Tan =

A

Sine/Cos

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