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Worksheets8th Grade Midterm Physical Science
Total questions: 86
Worksheet time: 43mins
Which statement best describes Frame of Reference
a. Motion is relative to position of the observer.
b. Motion is relative to your personal opinion.
c. Motion cannot be described without using a graph.
d. Wait, have we been studying motion this entire time??
M1.1 Two observers (standing on different sides of the road) make observations about a car driving by. The observations are different. Which could explain the difference in their observations of the motion of the car?
a. One of them must be wrong.
b. Both of them must be wrong.
c. They can both be correct, but simply viewing from different frames of reference.
d. It’s impossible to make observations of the car.
M2.1 What is the total distance traveled from time t = 0 s to time t = 20 s?
a. 26 cm
b. 24 cm
c. 4 cm
d. 12 cm
M2.1 What is the total displacement from time t=0 s to time t=20 s?
a. +26 cm
b. + 24 cm
c. +4 cm
d. +12 cm
M2.2 What is the average velocity of the trip from time t=0 s to time t=20 s?
a. +1.3 cm/s
b. +1.2 cm/s
c. +0.2 cm/s
d. +0.6 cm/s
M2.2 In order to compute the average speed of a trip, you would find the total _ (time, distance or displacement) and divide by the total _ (time, distance, or displacement).
time, distance
distance, time
time, displacement
displacement, time
M2.2 An object starts in one position, travels in a large circle and ends at the same position. What is the best description of the average velocity of the entire trip?
a. The average velocity was greater than the average speed.
b. The average velocity was less than the average speed.
c. The average velocity was the same as the average speed.
d. You cannot determine the average velocity or the average speed.
M2.2 Which object has the greatest velocity?
a. object A
b. object B
c. They are traveling at the same velocity.
d. Not enough information to tell.
M2.2 When the two lines intersect at 3 seconds,
a. they are traveling at the same velocity.
b. they are at the same position.
c. they are changing direction.
d. they have covered the same distance.
M2.3 Which of the following would describe the acceleration for the object shown in the velocity vs. time graph from 15-30 minutes?
a. Zero acceleration.
b. Negative acceleration.
c. Positive acceleration.
d. We do not have enough information to describe the acceleration.
M2.3 What is the direction associated with the motion of the object from question in the velocity vs. time graph from 15-30 minutes?
a. Positive
b. Negative
c. No direction
M2.3 You are going +5 m/s in your car when you see a traffic jam. You slow down to +2 m/s in 15 seconds. What is your average acceleration?
a. +0.2 m/s/s
b. -0.2 m/s/s
c. +5 m/s/s
d. -5 m/s/s
M2.3 What does it mean to have no acceleration?
a. The object is standing still.
b. The object is moving with constant velocity.
c. The object is standing still OR moving with constant velocity.
d. There is no such thing as no acceleration.
M3.1 Which statement best describes the starting velocity of Object A and Object B?
a. Both objects start at the origin.
b. Both objects start away from the origin.
c. Object A starts away from the origin and Object B starts at the origin.
d. Object B starts away from the origin and Object A starts at the origin.
M3.1 Which statement best describes the relative speed of Object A and Object B?
Object A travels 70 meters in 60 seconds. Object B travels 80 meters in 30 seconds.
a. Both objects have the same speed.
b. Object A is faster than Object B.
c. Object A is slower than Object B.
d. We do not have enough information to answer this question.
Which sections of the graph represent constant velocity? CHOOSE ALL THAT APPLY. *Note: Vertical lines between 2-3 are simply connector lines.
a.1
b.2
c.3
M3.1 Describe what is happening in the velocity vs. time graph below. Include: Speeding up/slowing down, positive/negative direction and positive/negative acceleration. Explain how you know this for EACH part!
The object is slowing down(it is going towards 0) in the negative direction(because it is in the negative halfdrant) with a positive acceleration(because a negative(slowing down) multiplied by a negative(negative direction) equals a positive (acceleration).
first answer is wrong
F4.3 The diagram below displays the possible normal forces acting on a skier (as well as the actual gravitational force) as she travels downhill. Which vector best represents the normal force on the skier?
a
b
c
d
F4.2 Timmy and Suzy are arm wrestling. Timmy pushes with a force of 40 N to the right while Suzy pushes with a force of 20 N to the left. Suzy's friend Sally cheats and pushes their hands to the left with a force of 30 N. What is the net force?
10N right
10N left
30N left
90N right
F 7.1 A student pulls a 2kg backpack across the ice (assume frictionless) to the right. The free body diagram and velocity vs. time graph of the situation are below. What is the magnitude of the applied force?
0.125N
0.25N
2.5N
25N
F7.1 Which free-body diagram(s) represent an object speeding up to the right? CHOOSE ALL THAT APPLY:
F7.1 Describe the possible motion of the object represented by the free-body diagram. CHOOSE ALL THAT APPLY:
a. Not moving
b. Moving with a constant velocity
c. Accelerating to the right
d. Accelerating to the left
F7.1 Which free body diagram would represent the graph if the mass of the objects in the diagrams were all 1 kg?
F4.1 Which of the following statements are true of the concept of force?
a. Force is a vector quantity; there is always a direction associated with it.
b. One Newton of force will cause a 1kg object to accelerate 1m/s/s.
c. Force is a push or pull exerted upon an object which results from the interaction of at least two objects.
d. All of the above
F4.3 The tire swing in your backyard hangs from a tree. Which statement best describes tension force?
a. The tension from the rope is up because the rope is holding the tire up.
b. The tension from the rope is up because it is always opposite gravity.
c. The tension from the rope is down because the tire is pulling down.
d. The tension from the rope is down because it is always in the same direction of gravity.
F6.1 Based on the free-body diagram, would the object accelerate?
- a. No, there is a balanced net force acting on the object.
b. No, there is an unbalanced net force acting on the object.
c. Yes, there is a balanced net force acting on the object.
d. Yes, there is an unbalanced net force acting on the object.
F5.1 As the mass of an object in space increases, what happens to the force exerted on other objects within that object's gravitational field?
a. The force exerted on other objects within its gravitational field increases
b. The force exerted on other objects within its gravitational field decreases
c. The force exerted on other objects within its gravitational field stays the same
d. There is no correlation between mass and the force
F4.3 Tucker has a mass of 80kg and Matthew weighs 845N on Earth. Which statement best describes their comparative size?
a. Tucker weighs more than Matthew.
b. Matthew weighs more than Tucker.
c. Tucker and Matthew weigh the same.
d. There is not enough information to compare.
F4.3 Which statement best describes the relationship between the mass and weight of an object?
a. As mass increases, weight increases
b. As mass increases, weight decreases
c. As mass increases, weight remains the same
d. There is no relationship between mass and weight
F6.3 A horse pulls a wagon with 500N of force and causes it to accelerate to the right. Which of the following statements is true?
a. The wagon pulls on the horse with a force greater than 500N.
b. The wagon pulls on the horse with a force less than 500N.
c. The wagon pulls on the horse with a force equal to 500N.
d. There is not enough information to determine the magnitude of force.
F4.2 Which statement best decribes net force?
a. Net force is the magnitude of the largest force acting on an object
b. Net force is the magnitude of the smallest force acting upon an object
c. Net force is the total sum of all forces and can only be calculated by ignoring the directions of the forces.
d. Net force is the amount of force left acting on an object after all balanced forces have been cancelled out.
F6.3 Newton's 3rd Law of interacting force pairs says that if I kick a soccer ball, the soccer ball kicks me back with equal force. However, the soccer ball still accelerates. The soccer ball still accelerates because...
a. The objects in this example do not have the same mass.
b. The objects in this example have the same mass.
c. There is still an unbalanced force acting on the soccer ball.
d. The soccer ball does not accelerate because the forces are equal and opposite.
F7.1 If the object represented in the data table had a mass of 1 kg, which Free body diagram would accurately represent the forces acting on the object?
F4.3 The diagram below displays the possible frictional forces acting on a skier (as well as the actual gravitational force) as she travels downhill. Which vector best represents the frictional force on the skier?
A
B
C
D
F6.1 When balanced forces act on an object, that object could...
a. not be moving.
b. move with constant velocity.
c. move with acceleration.
d. not be moving or move with constant velocity.
F5.1 True or False: Even when a magnet is not interacting with other objects, its magnetic field still exists.
True
False
F6.1 If an object is moving at a constant velocity and experiencing friction, what must be true about the force applied and the force of friction?
a. The force applied must be greater than the force of friction.
b. The force applied must be less than the force of friction.
c. The force applied must be equal to the force of friction.
d. The force applied and the force of friction have no direct correlation.
F4.3 Normal force...
a. Is always a push force directed at right angles away from the surface of the two interacting objects
b. Is always a pull force directed at right angles away from the surface of the two interacting objects
c. Is always a push force parallel to the surface of the two interacting objects
d. Is always a pull force parallel to the surface of the two interacting objects
F6.2 If an object with a mass of 7kg has +49N of net force acting on it, what is the rate of the object's acceleration?
a. +343m/s/s
b. +68.6m/s/s
c. +7m/s/s
d. There is not enough information to determine the rate of acceleration
F6.2 Assuming the mass of an object stays the same, what happens to the acceleration rate of an object if the net force acting on the object increases?
a. The acceleration rate will increase proportional to the force
b. The acceleration rate will increase by random increments
c. The acceleration rate will remain constant
d. The acceleration rate will decrease
F5.1 Which statement about fields is most accurate?
a. Field strength has no impact on the amount of force exerted on objects within the field
b. The stronger a field, the more force exerted on objects within that field
c. The stronger a field, the less force exerted on objects within that field
d. All fields apply the same amount of force regardless of field strength
F4.3 The diagram below displays the possible frictional forces acting on a skier (as well as the actual gravitational force) as she travels downhill. Considering the skier is increasing her velocity down the hill, what can be said about the frictional force acting on the skier?
a. The frictional force must be greater than the force of gravity causing her motion down the hill.
b. The frictional force must be less than the force of gravity causing her motion down the hill.
c. The frictional force must be the same as the force of gravity causing her motion down the hill.
d. There is not enough information to determine the relationship between frictional force and the force of gravity causing her motion down the hill.
E1.1b An 5 kg object is held at a height of 8 meters on planet Earth. How much Eg (gravitational potential energy) would the object have?
a. 40 Joules
b. 200 Joules
c. 392 Joules
d. 401 Joules
E2.2 Which graph could represent an object that is falling through air and experiencing air resistance?
E2.1 A 12 Newton force is applied to the left and the object displaces 2 meters to the right. How much work is being done by the applied force?
a. +12 Joules
b. +24 Joules
c. -12 Joules
d. -24 Joules
E2.2a A 30kg object in free fall reaches a velocity of 15 m/s when it hits the ground. What was the original height of the object before it started falling? (Assume no air resistance)
a. 10.35 m
b. 11.48 m
c. 22.40 m
d. Cannot be determined from this information
E1.1 Energy is the…
a. Change in force
b. Net force applied to any object
c. Ability to do work or cause change
d. Work divided by force
E1.2a In the middle of a free fall an object has 20 Joules of Eg and 10 Joules of Ek. How much Ek would the object have later in that free fall if it was left with 5 Joules of Eg? (Assume there is no air resistance or friction).
a. 5 Joules
b. 10 Joules
c. 15 Joules
d. 25 Joules
E2.1 A 5 N force is applied to the right and the object displaces 10 meters to the right. How much work is being done by the applied force?
a. +25 Joules
b. +50 Joules
c. -25 Joules
d. -50 Joules
E2.2a A 2 kg object is dropped from a height of 5 meters on planet Earth. How much Ek would the object have at the bottom of the fall?
a. 9.8 Joules
b. 98 Joules
c. 981 Joules
d. 440 Joules
E1.1a An object with a mass of 2 kg is moving with a velocity of 10 m/s. How much Ek (kinetic energy) does the object have?
a. 20 Joules
b. 50 Joules
c. 100 Joules
d. 200 Joules
E1.2 An object has 25 Joules of Eg (gravitational potential energy) at the top of a hill. The object rolls down a 10 meter frictionless hill. How much Ek (kinetic energy) would the object have at the bottom of the hill?
a. 2.5 Joules
b. 25 Joules
c. 250 Joules
d. This cannot be determined from the given information
E1.1b An object has 2452.5 Joules of Eg. The object is at a height of 50 meters. What is the mass of the object?
a. 5 kg
b. 10 kg
c. 15 kg
d. 20 kg
E2.2b Use the Graphs for Energy at 0 Seconds and Energy at 5 seconds to choose the scenario that best describes what happens to the object between 0 and 5 seconds. Choose the description that makes the most sense:
a. The object is elevated at some height and not moving at 0 seconds, but falls through the air for five seconds transforming all of the energy to thermal energy. The total amount of Energy stays the same.
b. The object is elevated at some height and is moving slowly at 0 seconds, but falls through the air for five seconds transforming all of the gravitational potential energy to kinetic. The total amount of Energy stays the same.
c. The object is elevated at some height and not moving at 0 seconds, but falls through the air for five seconds transforming some of the gravitational potential energy to kinetic and thermal energy. The total amount of Energy stays the same.
d. The object is resting on the ground and not moving at 0 seconds, but accelerates through the air for five seconds transforming some of the gravitational potential energy to kinetic and thermal energy. The total amount of Energy stays the same.
E2.1 An object is being pushed horizontally to the right with a force of 5 Newtons on a perfectly flat surface. The object displaces to the right 1 meter. Gravity is pulling down on the object with 20 Newtons of Gravitational Force. How much work is being done by GRAVITY?
a. +5 Joules
b. +10 Joules
c. -5 Joules
d. -10 Joules
e. No work is done by gravity
E2.2 Which graph could represent an object that moves horizontally along a surface with friction?
E2.2c The most common form of energy associated with dissipation is __________ because …
a. Gravitational Potential; dissipated energy always raises the height of an object
b. Thermal; the kinetic energy of objects gets passed into millions of surrounding molecules moving in many different directions, which makes it difficult for the energy to be used to do work.
c. Kinetic, dissipated energy usually gets passed into another single object and work can easily be done
d. Elastic Potential, energy only dissipates when stretching or compressing a stretchy material
EL1.1 If there is a high amount of voltage and a low resistance there will be a small current.
True
False
EL1.1 If there is a low amount of voltage and a high resistance there will be a small current.
True
False
Voltage
a. The difference in charge between two sides of a circuit.
c. The flow of electric charge.
b. The quantity that measures how a device or material reduces the electric current flow through it.
Current
a. The difference in charge between two sides of a circuit.
c. The flow of electric charge.
b. The quantity that measures how a device or material reduces the electric current flow through it.
Resistance
a. The difference in charge between two sides of a circuit.
c. The flow of electric charge.
b. The quantity that measures how a device or material reduces the electric current flow through it.
Conductor
a. Materials that do not easily allow the movement of free electrons.
b. Materials that easily allow the movement of free electrons.
Insulator
a. Materials that do not easily allow the movement of free electrons.
b. Materials that easily allow the movement of free electrons.
EL1.2 Which of the following statements is true about metals?
a. Metals are typically good conductors of electricity because their electrons are held firmly by the nucleus, not allowing them to move freely.
b. Metals are typically good conductors of electricity because their electrons are not held firmly by the nucleus, allowing them to move freely.
c. Metals are typically poor conductors of electricity because their electrons are held firmly by the nucleus, not allowing them to move freely.
d. Metals are typically poor conductors of electricity because their electrons are not held firmly by the nucleus, allowing them to move freely.
EL1.2 Which of the following statements is true about non-metals?
a. Non-metals are typically good conductors of electricity because their electrons are held firmly by the nucleus, not allowing them to move freely.
b. Non-metals are typically good conductors of electricity because their electrons are not held firmly by the nucleus, allowing them to move freely.
c. Non-metals are typically poor conductors of electricity because their electrons are held firmly by the nucleus, not allowing them to move freely.
d. Non-metals are typically poor conductors of electricity because their electrons are not held firmly by the nucleus, allowing them to move freely.
EL2.1 In conventional flow model, the electric charge moves from the________side of the battery to the________side of the battery.
negative , postive
positive, negative
positive, positive
negative, negative
EL2.1 In electron flow, the electric charge moves from the________side of the battery to the________side of the battery.
negative, positive
positive, negative
positive,positive
negative,negative
EL2.1 If 20 coulombs of charge move past a single point in a circuit in 10 seconds, how many amps (c/s) of current is there moving through the wire?
2amps
5amps
10amps
20amps
EL3.1 What is the best description of how a battery works?
a. Batteries are made of a chemical paste that is filled with free electrons. In a complete circuit, the free electrons are able to travel back and forth between the positive and negative sides of the battery.
b. Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the cathode. In a complete circuit, electrons flow from the cathode to the anode.
c. Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode. In a complete circuit, electrons flow from the anode to the cathode.
d. Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. These three materials react to produce heat. This energy is then transformed into heat and light.
EL3.1 You have created a complete circuit with a 6V battery, two 10 Watt light bulbs and a closed switch. What is the potential difference of this circuit?
a.6V
b. 3V
c. 1.5V
d. Cannot be determined
EL3.2 Which best describes a volt?
a. It is a unit of current. Each volt represents how fast the electrons are moving through the circuit.
b. It is a unit of potential difference between two sides of a circuit. Each volt of potential difference would be equal to 1 joule of energy being carried per unit of charge (coulomb).
c. It is a unit of resistance. Each volt represents the resistivity of a material through which electrons are passing.
d. It is a unit of energy. Each volt represents how much energy is being carried by the electrons in the circuit.
EL3.2 Each volt of potential difference is equal to
a. One amp of current per coulomb of charge
b. One joule of energy per coulomb of charge
c. 100 joules of energy per coulomb of charge
d. 100 amps per coulomb of charge
EL4.1/4.2 Which best shows the energy transformation that takes place within a resistor?
a. sound to thermal
b. thermal to light
c. electrical to thermal
d. thermal to electrical
EL4.1/4.2 Current ____________ after the electrons transfer their energy to a device within a circuit.
a. continues to flow
b. stops flowing
c. reverses direction
d. speeds up significantly
EL4.1/4.2 What are resistors?
a. components within a circuit that reverse the flow of electrons
b. components within a circuit that completely stop the flow of electrons
c. components within a circuit that enhance the flow of electrons
d. components within a circuit that oppose the flow of electrons
Vector
magnitude and direction
only magnitude
Scalar
magnitude and direction
only magnitude
GPE
mass * gravity * height
1/2mass *velocity^2
mass * gravity
displacement/time
KE
displacement/time
force*displacement
1/2mass * velocity^2
mass*gravity(9.8)*height
True or False: Fg=mass*gravity falls
false
true
True or False Work =Force * Displacement
True
False
Acceleration=
velocity *time
displacement/time
distance/ime
Speed is
displacement/time
distance/time
Velocity
distance/time
displacement/time
True or False: Force= mass*accerlation
True
False
