Forces and Motion Unit Test

Question 1

What is a reference point?

Answer 1

a direction relative to an object in motion

Question 2

what are the two factors that determine an object’s speed?

Answer 2

distance and time (distance/time)

Question 3

what is velocity?

Answer 3

speed in a particular direction

Question 4

how is acceleration calculated?

Answer 4

difference in velocity/difference in time

Question 5

how do you combine forces in opposite same directions?

Answer 5

opposite- subtract smaller from the larger

same- add them together

Question 6

what can an unbalanced force do to an object’s motion?

Answer 6

make it start moving or change the object’s motion

Question 7

what is friction

Answer 7

a common force that opposes motion between two moving objects

Question 8

how can you determine if the forces on an object are balanced or unbalanced?

Answer 8

balanced forces have a net force of 0 newtons, unbalanced forces don’t

Question 9

define mass

Answer 9

a measure of the amount of matter in an object

Question 10

define weight

Answer 10

measure of the amount of gravitational force on an object

Question 11

how are mass and weight calculated?

Answer 11

mass is calculated using a balance and weight is calculated using a spring scale

Question 12

why do all objects fall at the same rate?

Answer 12

acceleration due to gravity is the same for all objects

Question 13

what is the rate for acceleration due to gravity

Answer 13

9.8 m/s (2)

Question 14

what factors determine how much gravitational force there is between objects

Answer 14

distance and mass

Question 15

what is projectile motion

Answer 15

the curved path an object follows when thrown or launched

Question 16

what forces act on falling objects

Answer 16

gravity and air resistance

Question 17

what is newtons first law

Answer 17

an object at rest/motion tends to stay in rest/motion unless acted upon by an unbalanced force

Question 18

define inertia

Answer 18

the tendency of all objects to resist any changes in motion

Question 19

what is newtons second law

Answer 19

force=mass x acceleration

Question 20

what is newtons third law

Answer 20

when one object exerts a force on a second object, the second exerts an equal and opposite force on the first

Question 21

what is momentum

Answer 21

mass x velocity

Question 22

what does the law of conservation of momentum state

Answer 22

during a collision, the amount of momentum always remains the same

Question 23

what is a fluid,

Answer 23

a nonsolid state of matter in which the molecules are free to move past each other

Question 24

what is atmospheric pressure

Answer 24

the pressure caused by the weight of the atmosphere

Question 25

what is water pressure

Answer 25

the pressure caused when under water at a certain depth

Question 26

how do fluids move?

Answer 26

the molecules move freely past each other

Question 27

define archimedes principle

Answer 27

the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of the fluid that the object displaces

Question 28

define bernoullis principle

Answer 28

pressure in a fluid decreases as the fuids velocity increases

Question 29

what is lift

Answer 29

upward force on an object that moves in a fluid

Question 30

define pascals principle

Answer 30

a fluid in equilibrium contained in a vessel exerts a pressure of equal intensity in all directions