1. A block of mass m resting on a horizontal
Question 1
03 - C
Force and Motion
20023 m m
A block of mass m resting on a horizontal frictionless surface
is connected to a second block of mass m by a light string
which passes over a mass less pulley as shown in the diagram.
When released the second block moves downward with a constant
acceleration.
The acceleration of the second block is
A block of mass m resting on a horizontal
frictionless surface is connected to a second
block of mass m by a light string which passes
over a mass less pulley as shown in the diagram.
When released the second block moves downward with a constant acceleration.
The acceleration of the second block is
Solution m T mg

2. Solution... The acceleration of the block m mg m mg 03 - C
Force and Motion
20023
Solution... m
A block of mass m resting on a horizontal frictionless surface
is connected to a second block of mass m by a light string
which passes over a mass less pulley as shown in the diagram.
When released the second block moves downward with a constant
acceleration.
The acceleration of the second block is m mg mg m
Solution m T mg

3. Slope of a velocity-time graph represents acceleration (Ex. 011)
Question 2
03 - C
Force and Motion
20026 v
(m/s)
0.2
0.4
0.6
0.8
1.0 1 2 3
t (s)
3.0 kg v
(m/s)
0.2
0.4
0.6
0.8
1.0 1 2 3
t (s)
3.0 kg
A block resting on a horizontal surface is connected to a second block by a light string which passes over a mass less pulley as shown in the diagram. The graph represents the speed of the blocks as a function of time when released from rest.
The tension in the string during the acceleration is about
A block resting on a horizontal surface is connected to a second block by a light string which passes over a mass less pulley as shown in the diagram. The graph represents the speed of the blocks as a function of time when released from rest.
The tension in the string during the acceleration is about
Solution v
(m/s)
0.2
0.4
0.6
0.8
1.0 1 2 3
t (s)
3.0 kg
Slope of a velocity-time graph
represents acceleration (Ex. 011) mg T

4. Solution... The tension in the string T mg
03 - C
Force and Motion
20026
Solution... v
(m/s)
0.2
0.4
0.6
0.8
1.0 1 2 3
t (s)
3.0 kg v
(m/s)
0.2
0.4
0.6
0.8
1.0 1 2 3
t (s) T
3.0 kg
A block resting on a horizontal surface is connected to a second block by a light string which passes over a mass less pulley as shown in the diagram. The graph represents the speed of the blocks as a function of time when released from rest.
The tension in the string during the acceleration is about mg
Slope of a velocity-time graph
represents acceleration
Solution v
(m/s)
0.2
0.4
0.6
0.8
1.0 1 2 3
t (s)
3.0 kg T mg
Slope of a velocity-time graph
represents acceleration (Ex. 011)

5. with constant acceleration Block (3m) moves downward
Question 3
03 - C
Force and Motion
20031 m 3m m 3m
Two blocks are attached to a light string which passes over a frictionless pulley as shown in the diagram. When released the blocks move with accelerations which are equal in magnitude.
The tension in the string during the acceleration is
Two blocks are attached to a light string which passes
over a frictionless pulley as shown in the diagram.
When released the blocks move with accelerations which
are equal in magnitude.
The tension in the string during the acceleration is
Solution m 3m mg T
Block (m) moves upward
with constant acceleration
Block (3m) moves downward

6. Solution... The tension in the string 3mg mg m 3m T 3mg mg 3m m 03 - C
Force and Motion
20031
Solution...
3mg mg m 3m m 3m
Two blocks are attached to a light string which passes
over a frictionless pulley as shown in the diagram.
When released the blocks move with accelerations which
are equal in magnitude.
The tension in the string during the acceleration is m 3m T
3mg mg
Solution T T
Block (m) moves upward
with constant acceleration 3m
Block (3m) moves downward
with constant acceleration m mg mg

7. Solution... The tension in the string Block (3m) moves downward with T
Force and Motion
20031
Solution... m 3m m 3m
Two blocks are attached to a light string which passes
over a frictionless pulley as shown in the diagram.
When released the blocks move with accelerations which
are equal in magnitude.
The tension in the string during the acceleration is
Block (3m) moves
downward with
constant acceleration
3mg T
Block (m) moves
upward with
constant acceleration mg T
Solution T T
Block (m) moves upward
with constant acceleration 3m
Block (3m) moves downward
with constant acceleration m mg mg

8. with constant acceleration Block (2m) moves downward
Question 4
03 - C
Force and Motion
20033 m 2m h
Two blocks of mass m and 2m are attached to a light string which passes over a frictionless pulley. Mass m is initially resting on the floor as shown in the diagram.When released the blocks move with accelerations which are equal in magnitude.
The speed of the blocks when they pass each other is
Two blocks of mass m and 2m are attached to a light string
which passes over a frictionless pulley. Mass m is initially
resting on the floor as shown in the diagram.When released
the blocks move with accelerations which are equal in
magnitude.
The speed of the blocks when they pass each other is m 2m h
Solution
Block (m) moves upward
with constant acceleration m 2m h mg
2mg T
Block (2m) moves downward
Equate Eq.1 and Eq. 2
The two block pass after block (2m)
has fallen a distance of h/2.
vo = 0

9. Solution... The speed of the blocks as they pass The two block
Force and Motion
20033
Solution...
The two block
pass after
block (2m)
has fallen
a distance
of h/2.
2mg mg
Two blocks of mass m and 2m are attached to a light string
which passes over a frictionless pulley. Mass m is initially
resting on the floor as shown in the diagram.When released
the blocks move with accelerations which are equal in
magnitude.
The speed of the blocks when they pass each other is m 2m h m 2m 2m h
2mg m mg
Solution
Block (m) moves upward
with constant acceleration m 2m h mg
2mg T
The two block pass after block (2m)
has fallen a distance of h/2.
vo = 0
Block (2m) moves downward
with constant acceleration
Equate Eq.1 and Eq. 2