Energy

Question 1

what is power

Answer 1

the rate of work done

Question 2

what is power measured in

Answer 2

watts

Question 3

what is work done

Answer 3

the total amount of energy transferred

Question 4

what is the formula for work done

Answer 4

force * distance

Question 5

what is the formula for power

Answer 5

work done / time taken

Question 6

what are the 2 types of forces

Answer 6

Contact and non-contact forces

Question 7

what is a non-contact force

Answer 7

a force that can be exerted between objects without them being in contact with one other

Question 8

what are the 3 non-contact forces

Answer 8

gravity
magnetism
electrostatic charges

Question 9

what is a contact force

Answer 9

a force that is exerted due to 2 objects being in contact and cannot happen without contact

Question 10

what is the resultant force

Answer 10

the overall force on an object

Question 11

what is a moment

Answer 11

a force that acts at a distance from a pivot and has a turning effect

Question 12

what is the formula for a moment

Answer 12

force * distance

Question 13

what is a lever

Answer 13

a simple machine made from a fulcrum

Question 14

what are the 3 types of levers

Answer 14

class 1
class 2
class 3

Question 15

what is a class 1 lever

Answer 15

where the input and output force are on opposite sides of the fulcrum and in opposite direction

Question 16

what is a class 2 lever

Answer 16

where the output force and input force are on the same side. the output force is closer to the fulcrum

Question 17

what is a class 3 lever

Answer 17

where the output force and input force are on the same side but the input force is closer to te fulcrum

Question 18

what are gears

Answer 18

toothed wheels that are meshed together and can transmit rotational forces and motion

Question 19

what are the 2 types of gears

Answer 19

high gear
low gear

Question 20

what is a high gear

Answer 20

when a larg input gear turns a smaller output gear which leads to a high speed and low turning effect

Question 21

what is a low-gear

Answer 21

where a smaller input gear turns a larger output gear which leads to a low speed and high turning effect

Question 22

what is the similarity between gears and levers

Answer 22

both transmit the rotational effect of forces