TEKS Grade 8 Science - 8.6.A Unbalanced Forces

Quiz by Texas Education Agency

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

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### Measures 1 skill fromGrade 8Science (2017)Texas Essential Knowledge and Skills (TEKS)

8.6a

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15 questions
• Q1
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?
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
• Q2
60s
8.6a
• Q3
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?
The boat will stop.
The boat will move to the west.
The boat will move faster.
The boat will move slower.
60s
8.6a
• Q4
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
#texas/c8b7bf60-4ca1-4238-b410-d6fd789531f0/B.png
#texas/c8b7bf60-4ca1-4238-b410-d6fd789531f0/A.png
60s
8.6a
• Q5
Users enter free text
60s
8.6a
• Q6
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?
Part 1 only
Parts 1 and 2 only
Part 3 only
Parts 2 and 3 only
60s
8.6a
• Q7
Users enter free text
60s
8.6a
• Q8
A leaf fell from a tree branch. The path it followed is shown in the diagram below. Which of these best describes why the leaf fell in a crooked path instead of straight down?
The upward force of the air on the leaf was greater than the downward force of gravity.
Once the leaf was in motion, it continued moving in the same direction because the forces were balanced.
Air currents and gravity applied changing and unbalanced forces to the leaf.
Objects with irregular shapes never fall in straight lines.
60s
8.6a
• Q9
Users enter free text
60s
8.6a
• Q10
60s
8.6a
• Q11
The diagram below shows a sled moving along a smooth, frictionless track. In which sections of the track will the sled experience an unbalanced force?
Sections 2 and 3
Sections 1 and 3
Sections 2 and 4
Sections 3 and 4
60s
8.6a
• Q12
The diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?
The speed of the car will increase.
The speed of the car will decrease to 1 m/s.
The speed of the car will not change.
The car will move at a constant speed of 13 m/s.
60s
8.6a
• Q13
Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student’s push is 4 N, what is the net force acting on the board?
4N
10 N
6N
14 N
60s
8.6a
• Q14
60s
8.6a
• Q15
Users enter free text