Check Point

Energy, Work, Power, and Machines

1. The ability to make things happen or do work is known as ______________

2. There are two main types of energy: energy that is stored, ____________ and energy of motion is ___________.

3. Energy is conserved which means energy is not __________ or _____________ it is only _________.

4. Question # 3 explain the Law of _____________________________.

5. Gravitational potential energy is, _______________ energy due to ____________________.

6. Chemical potential energy is _______________ energy in ___________________.

7. What does the picture show? Explain and label.

8. Name that Form of Energy: a. Energy built up due to height is …

b. The energy of moving parts is…c. The energy of moving particles is …d. The energy stored in bonds is …e. The energy in the nucleus of atoms

is known as … f. Energy that can travel through

empty space is … g. Energy of moving electrical charges

that flows through wires

9. Kinetic Energy depends on two things ___________ and _____________.

10. The formula E = mc2 means that ____________________________.

11. The formula in question #10 was developed by _________________.

12. When waste heat is released in to the environment it is known as _____________.

13. Work is defined as the ______ needed to _____ an object.

14. The unit of work is a(n) ______.

15. The rate at which work is done is called _______.

16. The unit used to describe #15 is ______.

17. Work is made easier by using _________.

18. Name that

a.

b.

c.

d.

e.

f.g.

19. Name that Simple Machine:a. ______________________ is a rigid bar that rotates around a

fixed point called the fulcrum b. ___________________ is a simple machine

consisting of a large wheel secured to a rod or bar on which it can

rotate.c. ______________________ consists of a grooved

wheel and a rope . d.______________________ is sloping surface with one end higher than the other e. _____________________ has one pointed end used for getting in-between surfaces. f. ____________________ has a inclined plane wrapped around a cylinder g. ___________________ have teeth that fit into each other and turn

20. A machine is a _______________ used to make ___________________ easier.

21. A machine changes the _______, _________ or __________________ of a force.

22. A simple machine has ____________________________ and is use to make _______________ easier.

23. Two or more simple machines combine to create a _____________________ machine.

24. What makes one machine more efficient than another? ______________________25. Mechanical Advantage is … _________

ANSWER KEY

1. The ability to make things happen or do work is known as ENERGY.

2. There are two main types of energy: energy that is stored, POTENTIAL ENERGY and energy of motion is KINETIC ENERGY.

3. Energy is conserved which means energy is not CREATED or DESTROYED it is only TRANSFERRED.

4. Question # 3 explain the Law of CONSERVATION OF ENERGY.

5. Gravitational potential energy is, STORED energy due to GRAVITY (HEIGHT).

6. Chemical potential energy is STORED energy in CHEMICAL BONDS.

7. What does the picture show? Explain and label. THE TRANSFER OF ENERGY …

PE KE AND KE PEENERGY IS ALSO TRANSFERRED TO THE ENVIRONMENT

MOST PE

MOST KE

PE KE

KE PE

8. Name that form of Energy: a. GRAVITATIONAL POTENTIAL

ENERGYb. MECHANICAL ENERGYc. THERMAL (HEAT) ENERGYd. CHEMICALe. NUCLEARf. ELECTROMAGNETICg. ELECTRICAL

9. Kinetic Energy depends on two things MASS and VELOCITY.

10 The formula E = mc2 means that MATTER CAN BE CHANGED INTO ENERGY AND VISA-VERSA.

11. The formula in question #10 was developed by ALBERT EINSTEIN.

12 When waste heat is released in to the environment it is known as THERMAL POLLUTION.

13. Work is defined as the FORCE needed to MOVE an object.

14. The unit of work is a JOULE (J).

15.The rate at which work is done is called POWER.

16. The unit of used to describe #15 is WATT (W).

17. Work is made easier by using MACHINES.

18. Name the

a.

b.

c.

d.

e.

f.g.

Gear

19. Name that Simple Machine:a. Lever is a rigid bar that rotates around a

fixed point called the fulcrum b. Wheel and Axle is a simple machine

consisting of a large wheel secured to a rod or bar on which it can rotate.

c. Pulley consists of a grooved wheel and a rope . d. Inclined Plane is sloping surface with one end higher than the other e. Wedge is has one pointed end used for getting in-between surfaces. f. Screw has a inclined plan wrapped around a cylinder g. Gears have teeth that fit into each other and turn

Gear, inclined plane, lever, pulley, screw, wheel and axle, wedge

20. A machine is a tool or device used to make work easier.

21. A machine changes the size, speed, and/or direction of a force.

22. A simple machine has little to no moving parts and is use to make work easier.

23. Two or more simple machines combine to create a compound machine.

24. What makes one machine more efficient than another? When the work output is high compared to the work input

25. Mechanical Advantage is …The number of times the machine multiplies the effort force.