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Topic: 8.6 Force, Motion and Energy

Quiz by Texas Education Agency

Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)

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Measures 4 skills from
Grade 8
Science (2017)
Texas Essential Knowledge and Skills (TEKS)

8.6b
8.6a
8.6c
8.7a

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33 questions
Show answers
  • Q1
    The three vehicles shown below are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck —
    Question Image
    is traveling on a curve in the road
    can accelerate faster than the other two vehicles
    is traveling in the opposite direction from the other two vehicles
    needs a large amount of force to move
    60s
    8.6b
  • Q2
    For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records data in the table below. Which of these best explains the student’s data?
    Question Image
    The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.
    The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.
    The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity
    The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.
    60s
    8.6a
  • Q3
    Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?
    The car with the larger mass will have less inertia than the car with the smaller mass.
    The car with the smaller mass will require less force to stop than the car with the larger mass.
    The car with the larger mass will maintain its velocity while traveling down the hill.
    The car with the smaller mass will take longer to stop than the car with the larger mass.
    60s
    8.6c
  • Q4
    Four students raced toy cars on a track. The mass and the acceleration of each car is recorded in the table below. Which toy car had the greatest applied force?
    Question Image
    3
    1
    4
    2
    60s
    8.6c
  • Q5
    Question Image
    60s
    8.6a
  • Q6
    Sometimes tectonic plates do not move easily past one another, and the plates become stuck. Forces build up, and when the plates finally move, tension is released, as shown below. The sudden movement of the plates is caused by —
    Question Image
    unbalanced forces
    the mass of the plates
    gravitational force
    the weight of the plates
    60s
    8.6c
  • Q7
    The diagram below shows a boat moving north in a river at 3 m/s while the current in the river moves south at 1 m/s. How will the boat be affected if it enters a part of the river where the current is moving south at 2 m/s?
    Question Image
    The boat will stop.
    The boat will move to the west.
    The boat will move faster.
    The boat will move slower.
    60s
    8.6a
  • Q8
    During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?
    Question Image
    The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.
    The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.
    The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.
    Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.
    60s
    8.6c
  • Q9
    Four students push carts filled with sports equipment across the gym. Each student pushes with the same amount of force. Which cart has the greatest change in speed?
    #texas/c8b7bf60-4ca1-4238-b410-d6fd789531f0/D.png
    Answer Image
    #texas/c8b7bf60-4ca1-4238-b410-d6fd789531f0/B.png
    #texas/c8b7bf60-4ca1-4238-b410-d6fd789531f0/A.png
    60s
    8.6a
  • Q10
    Users enter free text
    Type an Answer
    60s
    8.6a
  • Q11
    Question Image
    60s
    8.6c
  • Q12
    60s
    8.6b
  • Q13
    A student jumps off a sled toward the west after it stops at the bottom of an icy hill. Based on the law of action–reaction, in what direction will the sled most likely move as the student jumps off?
    Question Image
    East
    South
    West
    North
    60s
    8.6c
  • Q14
    A student used a video camera to record another student dropping a marble through water in a graduated cylinder. The students watched the video in slow motion and made the observations shown below. During which part or parts of the marble’s fall did the marble experience unbalanced forces?
    Question Image
    Part 1 only
    Parts 1 and 2 only
    Part 3 only
    Parts 2 and 3 only
    60s
    8.6a
  • Q15
    Users enter free text
    Type an Answer
    60s
    8.6a

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