Free Body Diagrams

Question 1

Formula for horizontal force/Tension Summation

Answer 1

ma (x) = -mg (sin(deta))

Question 2

Formula for Vertical summation

Answer 2

may = n - mg (cos (beta))

Question 3

Acceleration

Answer 3

T (cos (beta) ) / m

Question 4

Newton’s 1st Law

Answer 4

• You must push an object to keep it moving
• when you remove ALL EXTERNAL forces (including Friction) object moves w/ constant velocity

Question 5

Newton’s 2nd law

Answer 5

F = ma
Push/pull creates acceleration
Direction of a = direction of net force

Question 6

True or false?
Acceleration depends on mass.

Answer 6

True

Question 7

If 2 objects have the same FORCE will they have the same mass?

Answer 7

Yes because
W = mg

Question 8

True or False?
If a coffee moves and falls on your lap it is an example of inertial frame

Answer 8

False
An inertial is a set of coordinates that move w/ another.

Ex.
A coffee on a flat surface

Question 9

When body A applies FORCE on BODY B it is called….

Answer 9

An Action

Question 10

When BODY B applies back to BODY A it is called…

Answer 10

A reaction

Question 11

Think of apple on table:

N & mg is the same as

Answer 11

F (ab) = - F (ba)

Question 12

True or False?
Weight force is the same as mass

Answer 12

False

Question 13

Used to find y-coordinate Tension (force)

Answer 13

Sigma F y = may = n - mg (cos (beta))

Question 14

Used to find x-coordinate Tension (force)

Answer 14

Sigma F x = max = -mg (sin (beta) )

Question 15

Define friction

Answer 15

Opposed motion
Parallel to surface
Slows object down

Question 16

Define normal force

Answer 16

Perpendicular to surface
Causes object to not accelerate down wards

Question 17

Formula for normal force

Answer 17

N = mg
Has NO acceleration along y-axis

Question 18

Formula for normal force with Tension

Answer 18

N = mg - T

Normal force is reduced from weight because of tension

Question 19

Newton’s 3rd law

Answer 19

Action - reaction pair
Have the same Magnitude, but opposite direction.