Unbalanced Forces

Quiz by Kylie Middleton

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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10 questions
• Q1
The image provided shows two toy cars pushing against each other with a force given in Newtons. Which of the following describes how the two-car system will behave? The two cars will -
move at a constant speed to the right.
move at a constant speed to the left.
30s
8.6a
• Q2
Calculate the net force of the following situation. <-- 10 Newtons + --> 30 Newtons
--> 20 Newtons
<-- 40 Newtons
--> 40 Newtons
<-- 20 Newtons
30s
8.6a
• Q3
Two equal forces act at the same time on the same stationary object but in opposite directions. Which statement describes the object's motion?
The object changes direction.
The object accelerates.
The object remains stationary.
The object moves at a constant speed.
30s
8.6a
• Q4
Two football linemen push against each other in practice. They do not move, but then lineman B moves forward and lineman A moves backward. Why does this happen?
Because the lineman push in different directions, the net force is zero.
When the lineman push on each other, they cause action-reaction forces that are unequal.
Lineman A pushes with a greater force, causing a net force that acts in his direction.
The forces are balanced, but then line B exerts a greater force, causing unbalanced forces.
30s
8.6a
• Q5
What causes objects to move?
Balanced forces
Velocity
Acceleration
Unbalanced forces
30s
8.6a
• Q6
Speeding up, slowing down, and changing direction are all due to
no forces
unbalanced forces
balanced forces
30s
8.6a
• Q7
A boy is trying to pull a dog on a leash, but the dog and the boy are moving in the same direction. Which of the following best describes the forces in this situation?
The forces are unbalanced, and the boy’s force is greater.
The forces are unbalanced, and the dog’s force is greater.
The forces are balanced, and the net force is zero.
The forces are balanced, and the dog is weaker than the boy.
30s
8.6a
• Q8
Look at the picture of the race car. When the force of friction is equal to the force of the engine, what will happen?
the car will travel at constant velocity.
the car will stop instantly.
the car will speed up.
the car will slow down.
30s
• Q9
Calculate the Net Force.
60N, Right
0N
60N, Left
40N, Right
30s
• Q10
Which could be an example of an unbalanced force?
A baseball that has been thrown to home plate.
Earth orbiting the Sun
A ball at the top of a hill that is not moving
A plate sitting on a dining table
30s

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