test

Question 1

Density=

Answer 1

= mass/volume Kg/m ²

Question 2

Weight=

Answer 2

“the force of gravity on mass” weight = mass x g g=9.81 on earth F=ma

Question 3

Area=

Answer 3

=m²

Question 4

Pressure=

Answer 4

=Force / Area units are P or Pascals or N/m²

Question 5

The simple Machine (6)

Answer 5

1) Wedge 2) Pully 3) Screw 4) Lever 5) Inclined plane 6) Wheel/axle

Question 6

Energy Types (5)

Answer 6

1) Electric 2) Chemical 3) Thermal 4) Nuclear 5) Mechanical

Question 7

Work=

Answer 7

=force x distance W=F x d unit is Joule or J or N x m

Question 8

Force=

Answer 8

= Mass x acceleration F=ma unit is Newton or N or Kg x m/s²

Question 9

Power=

Answer 9

=Work x time P=W x T units are Watts or W or J/s

Question 10

Acceleration=

Answer 10

= v2-v1/t2-t1 m/s²

Question 11

Mass metric units are

Answer 11

Kg

Question 12

Mechanical Advantage=

Answer 12

=Fo/Fi

Question 13

Efficency=

Answer 13

=Wi/Wo

Question 14

Gravitational Potential Energy=

Answer 14

= weight x height

Question 15

Kinetic Energy=

Answer 15

=mass x velocity²/2 “energy of motion”

Question 16

Hydraulic Pressure=

Answer 16

Pressure is applied to fluid in all directions equally

Question 17

Fluid=

Answer 17

Substance with no fixed shape

Question 18

Fluids move from

Answer 18

High pressure to low

Question 19

Machines work by

Answer 19

Changing the force to distance ratio

Question 20

Friction

Answer 20

A force opposing motion

Question 21

Inertia

Answer 21

matter resists change in motion

Question 22

Motion

Answer 22

change in position over time

Question 23

Frame of Reference

Answer 23

Background point assumed to be stationary to compare motion

Question 24

Three ways forces act

Answer 24

Push, Pull, Change directiion

Question 25

Newton's 3 laws

Answer 25

1)rest unless acting by force,motion unless acted on by force 2) acceleration depends on force and mass 3)Every action equal and opposite reaction

Question 26

Lubricant

Answer 26

lowered friction