Physics 1: Kinematics & Newton Flashcards Preview

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Flashcards in Physics 1: Kinematics & Newton Deck (55)
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1

Newton's First Law (Inertia)

An object in motion at constant velocity or at rest will stay that way, unless acted upon by an external force.

2

Newton's Second Law

F(net) = ma

3

Newton's Third Law

F(AB) = -F(BA)

4

Force on X

Product of (mass of X) and (acceleration of X) F=ma

5

If you have a POSITIVE net acceleration, he normal force must be ( > or < ) m*g

Greater than (>)

6

Fill in the blank with: ( > ) or ( < ) 

If you have a NEGATIVE net acceleration, the normal force must be _______ m*g

 

Less than (

7

F(net) =

F(net) = F(N) - mg = m a(net)

8

Air resistance

Function of v^2 and k, where "k" is proportional to the density of air and the surface area of the mass.

9

Kinetic friction

f(k) =u(k)F(n)

10

Static Force: F(s)

F(s) = F(applied)

11

Fs(max)

minimum force required to get object to move = u(s)F(n)

12

Static and kinetic co-efficient relationship

 µs is ALWAYS  >  µk

13

What forces are acting on a box at rest on an inclined plane

f(s) = f(applied) = mgsin(theta)

14

fs(max)=

u(s)mgcos(theta)

15

As the angle of an inclined plane (θ ) increases, what happens to the

a) applied force,

b) static force fs

c) MAXIMUM static friction (fs,max)?

As θ increases,

a) fapplied increases,

b) the static force increases

c) fs,max DECREASES

16

Gravitational Force

F= (Gm1m2)/r2

Two masses will exert an attractive force on one another inversely proportional to the square of the distance between them.

17

Uniform Circular Motion

The net force on an object moving at a constant speed on a circular path points toward the center of the circle.

18

F(centripetal)

F(c)=(mv^2)/r

19

Centripetal Acceleration

a(c) = v^2/2

20

Circumference of a circle

C = 2(pi)r Conversion: 2(pi)rad = 360 degrees

21

Theta of a circle (relation to arc length (s) and radius (r) )

theta= s/r

22

Angular speed (w)

2(pi)f = v/r

23

Torque

rotational analog of force is a vector Units: Newton meter (N*m) NOTE: Joules are (N*m) but scalar Torque= F*l l=(r)(sin(theta))

24

Torque rotational convention

Torque > 0: Counterclockwise Torque < 0: Clockwise

25

Rotational equilibrium

An object is in rotational equilibrium when the sum of the torques acting on it is zero.

26

Work

Work=Fd cos (theta) SCALAR unit: joules "transfer of energy" N*m = Joules

27

"Positive Work"

Work done on a system = transfer of energy INTO system. KE goes up

28

Energy

JOULES Kinetic Energy = (1/2)mv^2

29

Average Power (Watt)

Watt = Joules/second P=change in energy/change in time P= F*v

30

Work Energy Theorum

Work(net) = change in KE +work: gain KE -work: lose KE