science review chap 4

Question 1

metric unit for mass

Answer 1

kg

Question 2

work

Answer 2

the amount of effort spent when a force causes an object to move a distance

Question 3

gravity

Answer 3

force of attraction between two objects because of their mass

Question 4

kinetic energy

Answer 4

energy of an object in motion

Question 5

metric unit for force

Answer 5

Newtons

Question 6

mechanical system

Answer 6

group of physical parts that interact with each other and function as a whole in order to complete a task

Question 7

weight

Answer 7

amount of force on an object due to gravity

Question 8

friction

Answer 8

force that opposes the relative motion of an object

Question 9

energy

Answer 9

ability to do work

Question 10

mechanical advantage

Answer 10

amount by which a machine can multiply an input force, determined by the ratio of the output force to the input force

Question 11

categories of force

Answer 11

contact force and action-at-a-distance

Question 12

types of energy

Answer 12

kinetic and potential

Question 13

how a mechanical system makes work easier

Answer 13

mechanic systems make work easier by changing the force, distance, or direction needed to perform task