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Worksheets[H] Dynamics Review
Total questions: 26
Worksheet time: 58mins
In the absence of an external force a moving
object will...
A slow down and come to a stop
B speed up
C move with a constant speed in a long a straight
line
D turn to the right
E turn to the left
A passenger standing in a moving bus, facing forward suddenly falls forward. This can be an indication which of the following?
A The bus speeds up
B The bus slows down
C The bus doesn’t change its velocity
D The bus turns to the right
E The bus turns to the left
A heavy box sits on a floor. Which of the following about the net force on the box is true?
A Nonzero vector pointing up
B Nonzero vector pointing down
C Nonzero vector pointing left
D Nonzero vector pointing right
E It is zero
A loaded truck collides with a car causing a huge damage to the car. Which of the following is true about the collision?
A The force on the truck is greater than the force
B
The force on the car is greater than the force on
the truck
C
The force on the truck is the same in magnitude
as the force on the car
D During the collision the truck makes greater
displacement than the car
E During the collision the truck has greater
acceleration than the car
The Earth pulls down on a railroad wagon with a force of 200 kN. Which of the following is the “reaction force”?
A The wagon pulls up the
Earth with 200 kN
B
The wagon pushes down
the railroad with 200 kN
C The railroad pushes up the
wagon with 200 kN
D
The buoyant force pushes up the wagon with
200 kN
E The wagon pushes down the Earth with 200 kN
A railroad wagon pushes down on a railroad with a force of 200 kN (or 200,000 N). Which of the following is the “reaction force”?
A The wagon pulls up the Earth
with 200 kN
B
The wagon pushes down the
railroad with 200 kN
C The railroad pushes up the wagon with 200 kN
D
The buoyant force pushes up the wagon with
200 kN
E The wagon pushes down the Earth with 200 kN
Which of the following is true about an astronaut’s weight on the surface of Moon compare to Earth?
A Weight is the same, mass is less
B Weight is less, mass is the same
C Weight is less, mass is less
D Weight is less, mass is greater
E Weight is greater, mass is the same
An object is thrown straight up. How do we compare the net force on the object to its weight when it is on the highest point at the path?
A It is greater than the weight
B It is slightly less than the weight
C It is zero
D It is equal to the weight
E It can’t be determine
In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. What is the x-component of the gravitational
force?
A mg cosθ
B mg sinθ
C mg tanθ
D mg
E Zero
In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. What is the y component of the gravitational force?
A mg cosθ
B mg sinθ
C mg tanθ
D mg
E Zero
In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. What is the normal force applied to the block?
A mg cosθ
B mg sinθ
C mg tanθ
D mg
E Zero
In the diagram below, a block of mass m slides down an inclined plane with a constant speed at an angle θ with respect to the horizontal. What is the kinetic friction force applied to the
block?
A μmg cosθ
B μmg sinθ
C μmg tanθ
D μmg
E Zero
What is the normal force on the block?
A 50 N
B 40 N
C 30 N
D 20 N
E 10 N
17 What is the friction force between the block and
inclined plane?
A 2 N
B 5 N
C 6 N
D 30 N
E 40 N
A system of two blocks is accelerated by an applied force of magnitude 20 N on the frictionless horizontal surface. The tension in the string between the blocks is most nearly...
A block of mass m is pulled along a horizontal surface at constant speed v by a force Fapp , which acts at an angle of θ with the horizontal. The coefficient of kinetic friction between the block and the surface is μ.The normal force exerted on the block by the surface is:
A mg - Fappcosθ
B mg - Fappsinθ
C mg
D mg + Fappsinθ
E mg + Fappcosθ
A block of mass m is pulled along a horizontal surface at constant speed v by a force Fapp , which acts at an angle of ( with the horizontal. The coefficient of kinetic friction between the block and the surface is (.The friction force on the block is:
A μ(mg- Fappcosθ)
B μ(mg-Fappsinθ)
C μmg
D μ(mg + Fappsinθ)
E μ(mg + Fappcosθ)
A block with initial velocity of 3 m/s slides 9 m across a rough horizontal surface before coming to rest. What is the coefficient of kinetic friction?
A 0.10
B 0.50
C 0.30
D 0.05
E 0.01
A student performs an experiment on measuring friction forces in different trials. The first time he pulls a wooden block across a horizontal surface with a constant speed – trial A. The second time he makes the same surface incline at angle Θ with respect to the horizontal line – trial B. Which of the following is true about friction force between the block and the surface?
A The inclined case B has greater friction force
B The inclined case B has less friction force
C The friction force the same in both cases A and B
D
The friction force is not dependent from the
incline angle
E The friction force increases with angle
1 After firing a cannon ball a cannon moves in
opposite direction from the ball. This an example
of
A Newton’s First law
B Newton’s Second Law
C Newton’s Third Law
D Newton’s Law of Gravitation
E None of the above
Based on Scenario 1, please select the force diagram that ONLY includes Fg , Ff, and Fn (no components).
Modified Atwood's Machine
Two blocks with masses 5 kg and 2 kg are initially held at rest, connected together by a string and hung from a vertical pulley. Once released from rest, the system accelerates; Block 1 (5 kg) accelerates downward while Block 2, 2 kg) accelerates upward
a. Calculate the acceleration of the system. (on your paper)
b. Calculate the force of tension within the system (Round to 2 sig figs, no units)
If you're unsure how to tackle this problem, watch this video here:
https://www.loom.com/share/0ef7c79979a444e2bfbb6820e467fb63?t=714&sid=4fb4dcdb-d420-475b-a306-e160111842a1
(a)
Modified Atwood's Machine
Two blocks with masses 7 kg and 3 kg are initially held at rest, connected together by a string and hung from a vertical pulley. Once released from rest, the system accelerates; Block 1 (7 kg) accelerates downward while Block 2, 3 kg) accelerates upward
a. Calculate the force of tension within the system (on your paper)
b. Calculate the acceleration of the system. (Round to 2 sig figs, no units)
If you're unsure how to tackle this problem, watch this video here:
https://www.loom.com/share/0ef7c79979a444e2bfbb6820e467fb63?t=714&sid=4fb4dcdb-d420-475b-a306-e160111842a1
(a)
Elevator Problem
Billy has a mass of 10kg and is riding in an elevator at the mall. If the elevator is speeding up at +5 m/s^2, what would their apparent weight be? Apparent Weight means Force of Normal. (Round to 3 sig figs, no units)
If you're unsure how to tackle this problem, please watch this video:
https://www.loom.com/share/0ef7c79979a444e2bfbb6820e467fb63?sid=16eb9aaf-c36b-4712-92c5-0c0f79eb036c
(a)
Elevator Problem
Tom has a mass of 68kg and is riding in an elevator at their home's standard deep storage unit. If the elevator is slowing down at -2 m/s^2, what would their apparent weight be? (Round to 3 sig figs, no units)
If you're unsure how to tackle this problem, please watch this video:
https://www.loom.com/share/0ef7c79979a444e2bfbb6820e467fb63?sid=16eb9aaf-c36b-4712-92c5-0c0f79eb036c
(a)
Elevator Problem
As Bruce Wayne solemnly enters his home elevator, he has a mass of 75kg. If the elevator is speeding up at 5 m/s^2, what would their apparent weight be? (Round to 3 sig figs, no units)
If you're unsure how to tackle this problem, please watch this video:
https://www.loom.com/share/0ef7c79979a444e2bfbb6820e467fb63?sid=16eb9aaf-c36b-4712-92c5-0c0f79eb036c
(a)
