APC -Unit 2. 2 nd Law. A 72kg person stands on a scale which sits on a floor of elevator. It starts to move from rest upward with speed v(t) = 3t + 0.2t 2 ,. a) f ind scale reading at t = 4.0s. b) If elevator is at x =10m when t =2.0s, find location at t = 4.0s . Equilibrium.
A 72kg person stands on a scale which sits on a floor of elevator. It starts to move from rest upward with speed v(t) = 3t + 0.2t2,
a) find scale reading at t = 4.0s.
b) If elevator is at x =10m when t =2.0s, find location at t = 4.0s
When net force in all directions is zero
Find the tension in cable A and B
a) depends on whether he stands on one or two feet
b) much more than W
c) much less than W
d) approximately W/2
e) approximately W
A block of mass M and a block of mass m are connected by a thin string that passes over a light frictionless pulley. Find the acceleration of the system using only variables and constants.
Find system acceleration using only variables and constants.
Now find tension
An object of mass 5.0 kg is subjected to a rightward force in newtons of F = 3t2 – 4t where t is measured in seconds. The object has velocity v = 7.0m/s, left at t = 2.0s. Determine the velocity & acceleration of the object at t = 9.0s.
A force that acts parallel to surfaces in contact with one another. Two types are kinetic and static.
A 10 kg box is pulled with a force of 30N along a rough floor (μk = 0.30) as shown.
Natural Log properties:
There are times when the power rule is not an option for use as an integration technique.
For times greater than 0, an object beginning at the origin moves in one dimension according to the following expression:
Find the distance traveled by the object during the first 10 seconds.
An equation that relates a quantity and its derivatives is called a differential equation. In APC Physics, we only need to be familiar with a few basic Diff E q’s. The independent variable will always be time, t.
The acceleration of an object is given by the following function:
Derive an expression for the velocity as a function of time assuming initial conditions are that x = 0 and v = 4m/s at t=0.
a = –1.2x–0.8x3 and when x = +5m, v = 4m/s. Determine how far does the particle travel before coming to rest? (note ‘a’ is given in terms of x)
v(t) = 5e-t/2
Find the displacement of the particle from t = 0 to t = 4s.
v(t) = 60 (1-e-t/10)
Find an expression for the displacement as a function of time.
The tension is half in the picture on the left of what it is on the right since chair is supported by 2 ropes instead of 1
Is there a difference in the tension in the rope attached to the chair in the 2 situations? If so, what?
With what force must the man pull on the rope to rise at constant speed?
Force on rope
Centripetal Force, FC , is a special way to say FNET
Consider amusement park ride of the rotating swings. Swingcars rise into air until they reach a steady height. Find the speed of each swingcar if chain length is 5.0m and the angle btw vertical and chain is 35o
Force analysis of car without friction
What force provides FC on car to be able to perform circular motion?
What speed does car need to execute curve without friction assuming radius of curve is R and angle of curve is θ?