Energy and Simple Machines

Question 1

What is thermal energy?

Answer 1

If Na’im climbed a mountain and started to sweat, his body would produce thermal energy as he wiped the sweat from his forehead.

Question 2

What is radiant energy?

Answer 2

Comes from the sun.

Question 3

How energy is transferred in a remote control car that uses batteries.

Answer 3

Chemical energy in the battery is being converted to mechanical energy in the wheels.

Question 4

Newton discovered three laws to describe what?

Answer 4

Forces and motion.

Question 5

Newton’s third law of motion describes that for every action, there is a what?

Answer 5

Reaction.

Question 6

You are riding on a sled and the sled suddenly stops and you fly forward.

Answer 6

Law #1

Question 7

You try to push open a heavy door while you are on rollerblades but you roll backward.

Answer 7

Law#3

Question 8

Sliding a big box up a ramp in harder than slicing a small box.

Answer 8

Law #2

Question 9

It takes less force to push an empty grocery cart than a full grocery cart.

Answer 9

Law #3

Question 10

You put your milkshake on the dashboard of your mom’s car but when he car suddenly stops, the drink flies off.

Answer 10

Law #1

Question 11

Touching a metal spoon inside of a boiling pot of soup is an example of what?

Answer 11

Conduction

Question 12

Conduction, convection, and radiation are all ways that

Answer 12

Thermal energy can be transferred

Question 13

Energy can be transferred from a warmer object to a cooler object causing both to reach

Answer 13

thermal equilibrium

Question 14

If the flame from a stove is heating up soup in a pan, this would be an example of

Answer 14

Radiation

Question 15

If soup is heated up and the soup at the bottom heats up first and rises to the top of the pan and then sinks back down, this would be an example of

Answer 15

Convection

Question 16

If two motorcycles are riding at the same speed of 30mph, their velocities are different, explain why

Answer 16

Velocity is direction - they are both going 30 mph but are traveling in different directions

Question 17

If the temperature in your living room is 80 degrees in the summer, while in the attic the temperature is 90 degrees, explain why the attic is hotter than in your living room?

Answer 17

Convection - warm air rises, while cold air sinks

Question 18

What is motion?

Answer 18

Can be described and measured by position, speed, velocity and acceleration.

Question 19

The _______ of a race car can be found by measuring how far it moved in a certain time.

Answer 19

Speed

Question 20

Turning left or right, speeding up or down describes the race car’s ___________

Answer 20

Acceleration

Question 21

If a race car reaches a top speed of 175mph moving south along a track, this describes the race cars ___________

Answer 21

Velocity

Question 22

Explain why most of our pots and pans have wood or plastic handles?

Answer 22

Plastic and wood are insulators so you won’t burn your hand unlike metal which will conduct heat/energy

Question 23

Name some insulators

Answer 23

Glass, cork, plastic forks, cotton sheets and a wool scarf.

Question 24

Name some conductors

Answer 24

Copper penny, a gold ring, an aluminum can.

Question 25

A ________ is a simple machine that has an arm that pivots on a point called a fulcrum

Answer 25

Lever

Question 26

The ___________ is the amount that a machine makes work easier

Answer 26

Mechanical Advantage

Question 27

A _________ consists of a rope wound around a wheel and can make lifting easer

Answer 27

Pulley

Question 28

A _________ is a simple machine that is made up of many levers and rotates on a shaft.

Answer 28

Wheel and axel

Question 29

___________ occurs between any two substances.

Answer 29

Friction

Question 30

An _____________ is a sloping surface used to move objects from one level to another.

Answer 30

Incline plane

Question 31

All forms of energy can be described as forms of _________.

Answer 31

Potential and Kinetic energy

Question 32

If Na’im hikes up a mountain, as he climbs higher and higher he gains_____________

Answer 32

potential energy

Question 33

In Na’im ate breakfast before he climbs a mountain, his body would change the
(a)_________ found in his food to (b) ________ so he could climb higher and higher.

Answer 33

(a) chemical energy

(b) mechanical energy