revision booklet questions Flashcards

i copy and pasted it in an ai fixed it so idk how good these are (29 cards)

1
Q

What happens to the chemical energy store in the cyclist’s body as they accelerate?

A

The chemical energy store decreases and the kinetic energy increases.

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2
Q

Calculate the kinetic energy of a cyclist with a mass of 80 kg and speed of 12 m/s.

A

K = 5760 J or 5.76 KJ

K = 1/2 × m × v^2 = 1/2 × 80 × 12^2

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3
Q

What is the change in gravitational potential energy of a person with a mass of 45 kg moving through a height of 2.0 m?

A

U_g = 882.9 J

U_g = m × g × h = 45 × 9.81 × 2

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4
Q

List three factors that affect the kinetic energy of a person on a zip wire.

A
  1. Change in vertical height
  2. Mass / weight
  3. Speed / velocity
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5
Q

Why is the increase in kinetic energy less than the decrease in gravitational potential energy on the zip wire?

A

Air resistance or friction of the pulley causes energy to be released as heat.

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6
Q

Why do different people have different speeds at the end of the zip wire?

A

Different body weights/shapes affect streamlining and air resistance.

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7
Q

How does the distance between particles in steam compare to that in liquid water?

A

The distance between particles in steam is greater.

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8
Q

How does the density of steam compare to that of liquid water?

A

The density of steam is less than the density of liquid water.

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9
Q

What is the purpose of surrounding a metal can with layers of newspaper in an insulation experiment?

A

The newspaper acts as an insulator, keeping heat in the metal can.

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10
Q

How does the internal energy of water change when heated from 20 °C to 25 °C?

A

The kinetic energy of the water particles increases, raising the thermal energy.

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11
Q

What is the acceleration of a horse that goes from 0 m/s to 9 m/s in 4 seconds?

A

a = 2.25 m/s²

a = (v_2 - v_1) / t = (9 - 0) / 4

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12
Q

What is the kinetic energy of a pony that is half the mass of a horse with 4000 joules of kinetic energy?

A

2000 J

Kinetic energy depends on mass.

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13
Q

Calculate the maximum speed of a car that traveled 170 m in 10 seconds.

A

17 m/s

s = distance / time = 170 / 10

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14
Q

How does the velocity of a rocket change as it moves upwards?

A

The velocity decreases to zero.

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15
Q

What is the difference between velocity and speed?

A

Velocity includes direction (vector quantity), while speed does not (scalar quantity).

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16
Q

Which graph shows how the velocity of a rocket changes as it falls from maximum height until it hits the ground?

17
Q

Describe the motion of a ball between points A and B on a velocity-time graph.

A

Constant acceleration.

18
Q

What direction is the ball moving between points C and D on the graph?

19
Q

How is the velocity of an aircraft different from its speed?

A

Velocity has direction (vector quantity), while speed is scalar with no direction.

20
Q

Determine the speed of an aircraft that traveled 12000 m in 50 seconds.

A

240 m/s

s_av = distance / time = 12000 / 50

21
Q

Calculate the time taken for an aircraft to decelerate from 250 m/s to 68 m/s at 0.14 m/s².

A

1300 s

t = (v_2 - v_1) / a = (68 - 250) / -0.14

22
Q

Calculate the mean force used to stop an aircraft that traveled 2000 m with 140,000,000 J of work done.

A

70,000 N

F = W / d = 140000000 / 2000

23
Q

Describe the relationship between the resultant force on a trolley and its acceleration.

A

As the force increased, the acceleration also increased.

24
Q

Describe the motion of a remote-controlled car during the first 30 seconds.

A

The car is accelerating.

25
Determine the speed of a remote-controlled car 20 seconds after it started moving, covering 2.8 m.
0.14 m/s ## Footnote s_av = d / t = 2.8 / 20
26
Calculate the area of a rectangle with length 100 m and width 30 m.
3000 m² ## Footnote A = l × w = 100 × 30
27
Calculate the gravitational potential energy of a mass of 75 kg at a height of 20 m.
15,000 J or 15 KJ ## Footnote U_g = m × g × h = 75 × 10 × 20
28
Calculate the acceleration of a van that accelerates from 2 m/s to 20 m/s in 12 seconds.
1.5 m/s² ## Footnote a = (v_2 - v_1) / t = (20 - 2) / 12
29
Calculate the distance traveled by a cyclist in 15 seconds with a velocity-time graph.
52.5 m ## Footnote A = 1/2 × b × h = 1/2 × 15 × 7