HW4 (due date: October 11, Tuesday)
1. When you are driving on the highway, it is necessary to keep your foot on the accelerator to
keep the car moving at a constant speed. In this situation
(a) the net force on the car is in the forward direction
(b) The
HW 8 (due date: Nov 10, Thursday)
1. A truck going 15 km/h has a head-on collision with a small car going 30 km/h. Which
statement is true?
(a) The truck has the greater change of momentum because it has the greater mass
(b) The car has the greater change
HW7 (due date: November 1, Tuesday)
1. Consider two frictionless inclined planes with the same vertical height. Plane 1 makes an
angle of 30 with the horizontal, and plane 2 makes an angle of 60 with the horizontal. Mass m1
is place at the top of plane 1,
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Ch 4
Two blocks with masses M1 and M2 hang one under the other.
Assume the blocks are at rest.
(a) Find T2, the tension in the lower
HW5 (due date: October 13, Thursday)
1. Rank the boxes on the basis of the magnitude of the normal force acting on them. Rank from
largest to smallest.
(a) (b) = (c) > (d) > (a)
(b) (c) > (b) > (d) > (a)
(c) (c) > (d) > (a) > (b)
(d) (c) = (b) > (d) > (a)
HW6 (due date: October 20, Thursday)
1. If the earth has twice its present mass, its orbital period around the sun (at our present
distance from the sun) would be
(a) 1 year
(b)
1
year
2
(c)
2 year
(d)
1
year
2
Fg ma
Gmearth msun
v2
mearth
r2
r
Gmsun v 2
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Ch 4
Two blocks with masses M1 and M2 hang one under the other.
Assume the blocks are at rest.
(a) Find T2, the tension in the lower
College Physics I
Exam 1 (9/27/2016)
Name:
1. Calculate 3.02 2.0, taking into account significant figures.
(a) 6
(b) 6.0
(c) 6.04
(d) 6.040
2. A ball is thrown straight up into the air. Assume there is no air resistance. At what point in its
flight does i
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Total KE for rolling
A hoop of radius R and mass M is rolling on a horizontal surface with a
constant angular speed of . Find the to
HW6 (due date: October 20, Thursday)
1. If the earth has twice its present mass, its orbital period around the sun (at our present
distance from the sun) would be
(a) 1 year
(b)
1
year
2
(c)
2 year
(d)
1
year
2
2. An astronaut is floating happily outside
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Gravitational Potential energy near Earths surface
y
y0
U
Conservation of mechanical energy
U1 K1 U2 K2
Hookes law
Fs
Fyou
Hookes l
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Which one cause more rotation (torque)?
F 1 N
F 1 N
r
F 1 N
F 2N
F
F 1 N
0
Torque
F
F F sin
r
F cos
Magnitude: rF rF sin r F
(Ro
Equations
vx v0 x ax t
v y v0 y a y t
1
x x0 v0 xt axt 2
2
2
2
vx v0 x 2ax ( x x0 )
1
y y0 v0 y t a y t 2
2
2
2
v y v0 y 2a y ( y y0 )
For a projectile, you can use a y g if you choose a coordinate where the positive y direction is
upward.
a
v2
R
f s ,max
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Which one cause more rotation (torque)?
F 1 N
F 1 N
r
F 1 N
F 2N
F
F 1 N
0
Torque
F
F F sin
r
F cos
Magnitude: rF rF sin r F
(Ro
HW4 (due date: October 11, Tuesday)
1. When you are driving on the highway, it is necessary to keep your foot on the accelerator to
keep the car moving at a constant speed. In this situation
(a) the net force on the car is in the forward direction
(b) The
Ch 3 Motion in a plane (9/13/2016)
3-4 Uniform circular motion
ex 3-8) An Audi is traveling in a circle at a constant speed of 40 m/s. It's acceleration is 10 m/s2.
What is the radius of the circle?
40
10
ex 3-9) Passengers in a carnival ride travel in a
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Gravitational Force
m
v
Gravitational force
r
M
r : distance between the Earth
center to the objects center
Gravitational Force
v
m
Displacement: the change in position of an object
Distance: the whole length that an object travels (always positive)
* Average speed vs Average velocity
distance
av. speed = ,
t1me elapsed
displacement
av. velocity = _
tlme elapsed ex)
Position at
Ch 4 Newton's laws of motion (9/15/2016)
Newton's 1st law
Newton's 2nd law
Newton's 3rd law
Free-body diagram
(1) Force
(2) Net force
Fnet
(3) Newton's 2nd law
Which one will accelerate more (or speed up more)?
Newton's 2nd law
SI Unit of force: kg m/s2
HW5 (due date: October 13, Thursday)
1. Rank the boxes on the basis of the magnitude of the normal force acting on them. Rank from
largest to smallest.
(a) (b) = (c) > (d) > (a)
(b) (c) > (b) > (d) > (a)
(c) (c) > (d) > (a) > (b)
(d) (c) = (b) > (d) > (a)
HW3 (Due date: September 20, Tuesday)
1. A ball thrown horizontally from the top of a building hits the ground in 0.5 s. If it had been
thrown with twice the speed in the same direction, it would have hit the ground in
(a) 4.0 s
(b) 1.0 s
(c) 0.50 s
(d) 0
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Work done by a constant force
F
m
F
F
r
W F r
( F cos )r
F r
Work-Energy Theorem
Wnet K
Work-Energy theorem
Net work done on an o
Chapter 5 Applications of Newton's laws (9/29/2016)
Fnet ma
Newton's 2nd law
Fnet, x max
F
net, y ma y
Fon m due to gravity mg w
Weight
ex) Find the tension in the string.
ex)
(a) Find the tension in the lower string.
(b) Find the tension in the upper s
Phys 1301
College Physics I
Dr. Kang
SCIT 318A
hkang@tamut.edu
903 334 6670
Office hours: MW 10-12pm & 2-3:30pm TR 10-12pm
Chapter 7
1. Work
2. Kinetic energy (K)
3. Work Energy theorem
4. Potential energy (U)
5. Conservation of Energy
6. Power
Conservati
HW1
1) The following conversion equivalents are given:
1 m = 100 cm 1 in = 2.54 cm 1 ft = 12 in
A bin has a volume of 1.5 . The volume of the bin, in
A) 35
B) 41
C) 47
D) 53
E) 59
, is closest to:
2) The following conversion equivalents are given:
1 mile
Reading assignment 3
Read section 4-5 in chapter 3 and section 1-2 in chapter 4
Chap 3
1. In a uniform circular motion, which quantity is constant?
(a) speed
(b) velocity
(c) acceleration
(d) position
2. In a uniform circular motion, the direction of velo
Chapter 4 Newton's laws of motion (9/22/2016)
Fnet ma
Newton's 2nd law
Fnet, x max
F
net, y ma y
Weight
4-6 Solving problems with Newton's laws: Free body diagrams
ex )
(a) A hockey puck is sliding at constant velocity across a frictionless ice surface.
Ch 4 Newton's laws of motion (9/15/2016)
Newton's 1st law
Newton's 2nd law
Newton's 3rd law
Free-body diagram
(1) Force
(2) Net force
Fnet
(3) Newton's 2nd law
Which one will accelerate more (or speed up more)?
Newton's 2nd law
SI Unit of force: kg m/s2
Exam 1 review (9/20/2016)
Ch 1
1. How many significant figures do the following numbers have?
(a) 0.03
(b) 0.030
2. Calculate 2.014 1.0, taking into account significant figures.
3. Calculate 2.12 3.1, taking into account significant figures.
4. Find the c
Ch 3 Motion in a plane (9/8/2016)
Which path describes the path of the box (neglecting air resistance) as seen by a person standing
on the ground?
3.1 Velocity in a plane
(a) Position
Position: r
(b) Displacement
Displacement: r
(
Average velocity: vav