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Entrance Physics > General Physics > Flashcards

General Physics Flashcards

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1
Q

What is period (T)?

A
  • time taken for one full oscillation
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2
Q

What is frequency?

A
  • number of complete oscillations per second
  • 1/period
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3
Q

3 basic physics quantities

A
  • length, time, mass
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4
Q

Average speed

A

distance moved/time taken

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5
Q

What is velocity?

A
  • distance travelled in a unit time in a stated direction
  • vector quantity
  • displacement/time taken
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6
Q

What is displacement?

A
  • distance moved in a stated direction
  • vector quantity
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7
Q

What is acceleration?

A
  • change in velocity per unit time
  • acceleration = change of velocity / time taken
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8
Q

What is uniform acceleration?

A
  • when object’s velocity is increasing/decreasing at a constant rate over a time interval
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9
Q

Negative acceleration

A
  • deceleration / retardation
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10
Q

How can the distance traveled be known in a velocity-time graph?

A
  • area under the graph
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11
Q

Acceleration in velocity-time graph

A
  • slope/gradient of the velocity-time graph
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12
Q

Velocity in distance-time graph

A
  • slope of the distance-time graph
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13
Q

Air resistance

A
  • has greater effect on light bodies than on heavy bodies
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14
Q

How do body fall? (free fall)

A
  • with uniform acceleration (acceleration of free fall, g)
  • neglect air resistance
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15
Q

Acceleration of free fall

A
  • uniform acceleration
  • denotion ‘g’
  • 9.8 (or) 10 meter per second squared
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16
Q

Angle of projection and range (projectile)

A
  • the range is maximum when angle of projection is 45 degrees
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17
Q

Newton’s 1st Law

A
  • law of inertia
  • object will remain at rest or in a state of uniform motion unless it’s acted on by a net external force
18
Q

Newton’s 2nd Law

A
  • body of constant mass, acceleration is directly proportional to net force applied to it
19
Q

Define 1 Newton.

A
  • force that will give a 1kg mass an acceleration of 1m/s^2 in the direction of the force
20
Q

Unit of luminous intensity

A

candela (cd)

21
Q

Center of Gravity of an Object

A
  • where entire weight acts on the object
22
Q

acceleration of free fall on the moon

A
  • 1/6 times less than on earth
  • g = 1.6 m/s^2
23
Q

skydiver free fall

A
  • at the start of the fall, the only force acting is person’s weight (acceleration g)
  • increasing air resistance, decreasing acceleration
24
Q

terminal velocity

A
  • maximum velocity during free fall
  • at terminal velocity, air resistance is equal to weight
25
Q

what is the purpose of a parachute?

A
  • to increase air resistance
  • terminal velocity is reduced
26
Q

Newton’s 3rd Law of Motion

A
  • When two bodies interact, the forces they exert on one another are equal in magnitude and opposite in direction
27
Q

When is a body in equilibrium?

A
  • when all the forces acting on it balance each other out
28
Q

What is center of gravity of an object?

A
  • where the gravitational force acts upon it
29
Q

Define 1 Joule

A
  • work done when a force of 1 N moves a direction of 1 m in the direction of that force
30
Q

Define a Watt

A
  • rate of energy transferred (work done) of 1 Joule per second
31
Q

Newton’s second law and momentum

A
  • net force acting on an object is directly proportional to rate of change of linear momentum of the object
  • net force and change in momentum are in the same direction

F = p/t

32
Q

Density

A
  • mass per unit volume of a substance
33
Q

Pressure

A
  • normal force acting per unit cross-sectional area
34
Q

Atoms in a crystalline material

A
  • arranged in a pattern
35
Q

non-crystalline material

A
  • arranged in a random way
  • called amorphous
36
Q

Compressive and tensile forces

A
  • compressive: spring being pressed
  • tensile: spring being pulled
37
Q

hooke’s law

A
  • extension of a spring is directly proportional to the force applied as long as the elastic limit is not exceeded
38
Q

What is strain?

A
  • fractional increase in original length of wire
  • extension divided by unit length
39
Q

What is stress?

A
  • force applied per unit cross-sectional area
  • similar to pressure
40
Q

What is Young modulus?

A
  • stiffness of material
  • ratio of stress to strain

Entrance Physics (3 decks)

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