Physics practice worksheet focusing on force, work, and energy principles.

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Worksheet Title: *PRACTICE WORKSHEET*

Topic: *FORCE, WORK AND ENERGY*

#### Section A: Fill in the blanks
1) ________ is the force that attracts objects toward each other.
2) The energy that we get from the hot interior of the Earth is called ________.
3) ________ is the amount of work done per unit time.
4) The ability to do work is called ________.
5) When an object is moved by a force, it gains ________.
6) A machine that uses a rope and pulley system is called a ________.
7) Energy from falling water is used to make ________.
8) ________ is the rate at which work is done.

#### Section B: Choose one word for the following
a) The capacity to do work with less effort. → ________
b) The energy that comes from the Sun. → ________
c) Energy obtained from muscles. → ________
d) The force exerted by a magnet. → ________
e) Correct the statement: "Work is done when a force moves an object." → ________

#### Section C: Define the following
a) Work → ________
b) Energy → ________
c) Power → ________

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Now, let's solve and explain each part step-by-step.

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✔ Section A: Fill in the Blanks

1) Gravity is the force that attracts objects toward each other.
→ *Explanation*: Gravity is the natural force that pulls objects with mass toward each other. For example, Earth pulls us down.

2) The energy that we get from the hot interior of the Earth is called geothermal energy.
→ *Explanation*: Geothermal energy comes from heat stored beneath the Earth's surface.

3) Power is the amount of work done per unit time.
→ *Formula*: $ \text{Power} = \frac{\text{Work}}{\text{Time}} $

4) The ability to do work is called energy.
→ *Explanation*: Energy is the capacity or capability to perform work.

5) When an object is moved by a force, it gains kinetic energy.
→ *Explanation*: Motion results in kinetic energy (energy of motion).

6) A machine that uses a rope and pulley system is called a block and tackle.
→ *Alternative answer*: *Pulley system* or *simple machine*. But “block and tackle” is more specific.

7) Energy from falling water is used to make hydroelectric power (or electricity).
→ *Explanation*: Hydroelectric dams use flowing water to generate electricity.

8) Power is the rate at which work is done.
→ Same as #3; confirms the definition.

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✔ Section B: Choose One Word

a) The capacity to do work with less effort → Mechanical advantage
→ *Explanation*: Machines give mechanical advantage by reducing the effort needed.

b) The energy that comes from the Sun → Solar energy
→ *Explanation*: Solar energy is derived from sunlight.

c) Energy obtained from muscles → Chemical energy
→ *Explanation*: Muscles store energy in chemical bonds (like ATP), which is converted into mechanical energy.

d) The force exerted by a magnet → Magnetic force
→ *Explanation*: Magnets exert invisible forces on magnetic materials.

e) Correct the statement: "Work is done when a force moves an object."
→ *Correction*: Work is done when a force causes an object to move in the direction of the force.
→ *Why?* Because if the force is perpendicular to motion (e.g., carrying a box horizontally), no work is done in physics terms.

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✔ Section C: Definitions

a) Work → Work is done when a force applied to an object causes it to move in the direction of the force.
→ *Formula*: $ \text{Work} = \text{Force} \times \text{Distance} \times \cos\theta $
→ *Units*: Joule (J)

b) Energy → Energy is the ability or capacity to do work. It can exist in many forms (kinetic, potential, thermal, etc.).
→ *Unit*: Joule (J)

c) Power → Power is the rate at which work is done or energy is transferred.
→ *Formula*: $ \text{Power} = \frac{\text{Work}}{\text{Time}} $
→ *Unit*: Watt (W) = Joules per second

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🔚 Final Answers Summary:

#### A. Fill in the Blanks
1. Gravity
2. Geothermal energy
3. Power
4. Energy
5. Kinetic energy
6. Block and tackle
7. Electricity / Hydroelectric power
8. Power

#### B. Choose One Word
a) Mechanical advantage
b) Solar energy
c) Chemical energy
d) Magnetic force
e) Work is done when a force causes an object to move in the direction of the force.

#### C. Definitions
a) Work: Force × Distance (in the direction of force)
b) Energy: Capacity to do work
c) Power: Rate of doing work

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If you have any specific questions about any part, or want diagrams or examples, feel free to ask!