Grade 12 Physics Worksheet: Life Cycles

Life Cycles Short Answer

Grade 12 Physics Life Cycles Short Answer Challenging 30 Questions 8 Views

Classroom Worksheet

Grade 12 Physics Worksheet: Life Cycles

Life Cycles Short Answer

Name____________________________

Date________________

Score______ / 30

Grade: Grade 12

Subject: Physics

Topic: Life Cycles

Time: 20 Minutes

Difficulty: Challenging

Questions: 30

Instructions:
Answer each question in complete sentences. Show calculations where needed. Questions begin with foundational ideas and gradually become more challenging. Use clear physics terms and explain your reasoning when appropriate.

Skills Practiced:

Life Cycles
Physics
Critical Thinking
Problem Solving

1Question

What is the meaning of the word "cycle" in physics when describing repeated motion or repeating processes?

2Question

Give one example of a repeating physical process that can be described as a cycle.

3Question

What is one difference between a periodic motion and a non-periodic motion?

4Question

Define frequency in terms of cycles.

5Question

Define period in terms of cycles.

6Question

If an object completes 8 cycles in 4 seconds, what is its frequency?

7Question

If the frequency of a wave is 5 Hz, what is its period?

8Question

State the relationship between frequency and period.

9Question

A pendulum takes 1.5 s to complete one cycle. How many cycles does it complete in 6 s?

10Question

A system has a period of 0.25 s. How many cycles does it complete in 2 s?

11Question

What is amplitude in an oscillating system?

12Question

In a simple harmonic motion graph, what does the equilibrium position represent?

13Question

How does increasing amplitude affect the energy of an oscillating system?

14Question

What is the main restoring force in a mass-spring system?

15Question

Why does a pendulum eventually stop swinging in real life?

16Question

Explain why a system can oscillate with nearly constant amplitude only if energy is supplied.

17Question

A wave has a speed of 12 m/s and a frequency of 3 Hz. What is its wavelength?

18Question

Write the equation that connects wave speed, frequency, and wavelength.

19Question

A wave has a wavelength of 0.8 m and a speed of 20 m/s. What is its frequency?

20Question

How does doubling the frequency of a wave affect its wavelength if wave speed stays constant?

21Question

What is meant by resonance in a physical system?

22Question

Why can resonance be useful in some devices but dangerous in structures?

23Question

A machine vibrates at a natural frequency of 6 Hz. What may happen if a driving force matches this frequency?

24Question

Describe one real-world example of resonance.

25Question

What is damping in an oscillating system?

26Question

How does heavier damping affect the number of visible cycles in an oscillation?

27Question

Explain the difference between kinetic energy and potential energy during simple harmonic motion.

28Question

A mass on a spring is released from its stretched position. At what point is its speed greatest, and why?

29Question

How do conservation of energy and oscillation work together in an ideal system with no damping?

30Question

A student says, "A cycle is just any movement that happens again." Use physics terms to improve this statement.

Answer Key

#	Answer
1	A cycle is one complete sequence of a repeated process that returns to the starting point or condition.
2	Examples include the motion of a pendulum, the orbit of a satellite, or the oscillation of a spring-mass system.
3	Periodic motion repeats at regular time intervals, while non-periodic motion does not repeat in a regular pattern.
4	Frequency is the number of cycles completed per second.
5	The period is the time taken to complete one full cycle.
6	The frequency is 2 Hz.
7	The period is 0.2 s.
8	Frequency and period are inversely related: frequency equals 1 divided by period, and period equals 1 divided by frequency.
9	It completes 4 cycles.
10	It completes 8 cycles.
11	Amplitude is the maximum displacement of the system from its equilibrium position.
12	It is the central position where the net restoring force is zero.
13	Increasing amplitude increases the energy of the system.
14	The restoring force is the spring force, directed toward the equilibrium position.
15	Because energy is lost to air resistance and friction, which dissipate mechanical energy as heat and sound.
16	Energy is continually lost to resistive forces, so external energy input is needed to maintain the amplitude.
17	The wavelength is 4 m.
18	Wave speed equals frequency times wavelength: v = fλ.
19	The frequency is 25 Hz.
20	The wavelength is halved.
21	Resonance is the large increase in amplitude that occurs when a system is driven at or near its natural frequency.
22	It can be useful for selecting specific frequencies in devices, but dangerous because large oscillations can damage structures.
23	The machine may undergo resonance and vibrate with a much larger amplitude.
24	A playground swing can move higher when pushed at the right timing, matching its natural frequency.
25	Damping is the reduction of amplitude over time due to energy loss.
26	Heavier damping causes the oscillations to die out faster, so there are fewer visible cycles.
27	Kinetic energy is greatest near equilibrium where speed is highest, while potential energy is greatest at maximum displacement.
28	Its speed is greatest at the equilibrium position because the potential energy has been converted into kinetic energy.
29	Energy continuously changes between kinetic and potential forms, but the total mechanical energy remains constant.
30	A better statement is: a cycle is one complete repeated sequence of motion or process that returns the system to its starting state or position after a regular interval.