Class One

Question 1

what are kinematics

Answer 1

description of motion in terms of an object’s position, velocity and acceleration

Question 2

what is displacement

Answer 2

change in position of an object

Question 3

what is velocity

Answer 3

tells us how fast an object’s position changes

Question 4

velocity formula

Answer 4

displacement / time

Question 5

speed is the..

Answer 5

magnitude of the velocity vector

Question 6

characteristics of speed

Answer 6

has no direct & can never be negative

Question 7

characteristics of velocity

Answer 7

specifies speed and direction

Question 8

what is acceleration

Answer 8

how fast an object’s velocity changes

Question 9

acceleration formula

Answer 9

change in velocity / time

Question 10

if acceleration points in the same direction as initial velocity..

Answer 10

speed is increasing

Question 11

if acceleration points in the direction opposite to initial velocity..

Answer 11

the speed is decreasing

Question 12

what is uniformly accelerated motion

Answer 12

when an object’s acceleration is constant

Question 13

slope of a position vs time graph gives..

Answer 13

velocity

Question 14

slope of a velocity vs time graph gives..

Answer 14

acceleration

Question 15

the area under a velocity vs time graph gives..

Answer 15

the displacement

Question 16

what is free fall

Answer 16

an object moving only under the influence of gravity

Question 17

gravitational acceleration

Answer 17

10 m/s²

Question 18

free fall acceleration and mass

Answer 18

the free fall acceleration of an object does not depend on its mass

2 objects would fall at the same time

Question 19

what is projectile motion

Answer 19

constant, downward acceleration due to gravity

Question 20

what is constant in projectile motion

Answer 20

horizontal motion velocity

Question 21

at the top of the parabola for projectile motion..

Answer 21

vertical velocity is 0

Question 22

symmetry of a parabola of projectile motion means..

Answer 22

the projectile’s total flight time will be twice the time required to reach the top

Question 23

horizontal displacement is also called..

Answer 23

range

Question 24

what is a force

Answer 24

a push/pull exerted by one object on another

Question 25

Newton's first law

Answer 25

an object's velocity will not change unless a net force acts on it no net force = no acceleration

Question 26

what is inertia

Answer 26

object's natural resistance to change in their state of motion

Question 27

Newton's first law is also known as..

Answer 27

the law of inertia

Question 28

Newton's second law

Answer 28

F_net = ma total force on an object = mass of object x acceleration

Question 29

what is force is not included in F_net

Answer 29

forces exerted BY the object

Question 30

mass of object = positive so..

Answer 30

the direction of acceleration is always the same direction of F_net

Question 31

Newton's third law

Answer 31

the forces in an action-reaction pair have the same magnitude and act in opposite directions \*\*does not say that the effects of the forces will be the same

Question 32

weight vs mass

Answer 32

weight: gravitational force exerted on an object mass: intrinsic property of an object

Question 33

Newton's Law of Gravitation

Answer 33

the magnitude of the gravitational force the universe exerts on an on object is proportional to the product of the object's masses and inversely proportional to the square of the distance between them

Question 34

Law of Gravitation formula

Answer 34

Question 35

what is friction

Answer 35

electrical attraction between atoms of one surface with those of another + roughness of surfaces

Question 36

categories of friction

Answer 36

static & kinetic (sliding) friction

Question 37

what is static friction

Answer 37

when there is no relative motion between the surfaces that are in contract (no sliding)

Question 38

what is kinetic friction

Answer 38

when there is relative motion between the surfaces

Question 39

what is normal force

Answer 39

the perpendicular component of the contact force exerted by a surface on an object

Question 40

force of kinetic friction formula

Answer 40

Question 41

the direction of the force of kinetic friction is always..

Answer 41

parallel to the surface opposite direction to the object's velocity

Question 41

the direction of the force of kinetic friction is always..

Answer 41

parallel to the surface opposite direction to the object's velocity

Question 42

the maximum coefficient of static force is always..

Answer 42

greater than the coefficient of kinetic force

Question 43

why is there only a maximum force of static friction formula

Answer 43

static friction is capable of supplying necessary force, but only up to a certain maximum

Question 44

the force due to gravity acting parallel to the inclined plane =

Answer 44

mg(sin∅)

Question 45

the force due to gravity acting perpendicular to the inclined plane =

Answer 45

mg(cos∅)

Question 46

what is a pulley

Answer 46

a device that changes the direction of tension that pulls on the object that the string is attached to