physics semester test

Question 1

a description of how close a measurement is to the correct or accepted value of the quantity measured

Answer 1

accuracy

Question 2

the degrees of exactness of a measurement

Answer 2

precision

Question 3

are those digits in a measurement that are known with certainty plus the first digits that is uncertain

Answer 3

significant digits

Question 4

a change in position of an object

Answer 4

displacement

Question 5

the total displacement divided by the time interval during which the displacement occurred

Answer 5

average velocity

Question 6

the rate at which velocity changes over time; an object accelerates if this speed, direction, or both change

Answer 6

acceleration

Question 7

the motion of a body when only the force due to gravity is acting on the body

Answer 7

free fall

Question 8

is a physical quantity that has both magnitude and direction

Answer 8

vector

Question 9

is the curved path that an object follows when thrown, launched or otherwise projected near the surface of earth

Answer 9

projectiles motion

Question 10

an action exerted on an object which may change the object’s state of rest or motion; has magnitude and direction

Answer 10

force

Question 11

is the tendency of an object to resist being moved, or if the object is moving, to resist a change in speed or direction

Answer 11

inertia

Question 12

a single force whose external effects in a rigid body are the same as the effects of several actual forces action on the body

Answer 12

net force

Question 13

is the state in which the net force on an object is zero

Answer 13

equilibrium

Question 14

an object at rest remains at rest, and an object in motion continues in motion with constant velocity ( this is constant speed in a straight line) unless the object experiences a net external force

Answer 14

Newton’s first law

Question 15

the acceleration of an object is directly proportional to the net force action on the object and inversely proportional to the object’s mass

Answer 15

Newton’s second law

Question 16

for every action, there is an equal and opposite reaction

Answer 16

Newton’s third law

Question 17

a measurement of the gravitational force exerted on an object; its value can change with the location of the object in the universe

Answer 17

weight

Question 18

a force that acts on a surface in a direction perpendicular to the surface

Answer 18

normal force

Question 19

the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest

Answer 19

static friction

Question 20

the force that opposes the movement of two surfaces that are in contact and are sliding over each other

Answer 20

kinetic friction

Question 21

the ratio of the magnitude of the force of friction between two objects in contact to the magnitude of the normal force with which the objects press against each other

Answer 21

coefficient of friction

Question 22

1 kg*m/s^2

Answer 22

newton

Question 23

the projections of a vector along the axes of a coordinate system

Answer 23

components of a vector

Question 24

anything is change

Answer 24

delta

Question 25

meter per second

Answer 25

velocity

Question 26

meters per second squared

Answer 26

acceleration

Question 27

N, Newton

Answer 27

force