physics

Question 1

Newton’s first law of motion

Answer 1

An object at rest will stay at rest until acted up by an external force (vice versa)

Question 2

Inertia

Answer 2

Objects ability to esist changes in motion

Question 3

Net force

Answer 3

when more than a single force acts on an object (shown by arrows

Question 4

vector quantity

Answer 4

force that has both magnitude and direction

Question 5

Scalar quantity

Answer 5

only magnitude (no direction)

Question 6

Mechanical Equilibrium

Answer 6

Net force is equal to zero

Question 7

support force

Answer 7

aka normal force, the upward force opposite to gravity. ex a book on a table in equilibrum

Question 8

Dynamic Equilibrium

Answer 8

an object moving i constant speed in a straightline path is also in equalibrium , state of no change. has 2+ forces acting on it

Question 9

linear motion

Answer 9

motion in a straight line

-speed

Question 10

speed

Answer 10

distance over time, ex mph

Question 11

instantaneous speed

Answer 11

speed at any instant in time

Question 12

average speed

Answer 12

total distance covered/ time interval

Question 13

velocity

Answer 13

how fast and what direction (vector quantity)

Question 14

constant velocity

Answer 14

motion in a straight line (direction) (no curves) at a constant speed

Question 15

changing velocity

Answer 15

either speed or direction change

Question 16

acceleration

Answer 16

how quick velocity changes (ex 0 to 60 in 2 seconds), has to include time.
depends on net force

Question 17

acceleration

Answer 17

applies to increases nad decreases in velocity, applies to curves also bc direction is changing

Question 18

free fall

Answer 18

only under influence of gravity. the acceleration is 10 mters per sec each sec

Question 19

velocity of a falling object on earth equation

Answer 19

free fall

v=gt

Question 20

Newtons second law

Answer 20

the acceleration of an object is directly proportional to the net force acting on the object and is inversely proportional to the mass of an object
(greater the mass the greater the inertia)

Question 21

friction

Answer 21

force produced when surfaces slide over one another (usually reducing net force and acceleration)
not dependent on speed, or the area of contact

Question 22

mass and voume: are they equal?

Answer 22

think the box filled with nuts and bolts vs empty box

same volume but diff mass

Question 23

newtons 3rd law

Answer 23

motion and vectors. for every action theres an equal and opposite reaction

Question 24

lift

Answer 24

when lift equals weight of object it will hover, but when lift is greater it will rise

Question 25

adding vetors along a parallel

Answer 25

if they act in same direction they add

opposite directions, subtract