question

Question

question | choice a | choice b | choice c
1. the sum of all forces acting on an object is known as… | applied force purple | normal force black | net force dark blue
2. which of the following is a characteristic of an unbalanced force? | equal in size, opposite in direction red | does not cause a change in the motion of an object purple | causes a change in motion of an object green
3. which of the following is a characteristic of a balanced force? | equal in size, opposite in direction red | causes a change in the direction of an object purple | causes a change in motion of an object green
4. which of the following represents balanced forces? | $\boldsymbol{\
ightarrow 11n \leftarrow 11n}$ white | $\boldsymbol{\
ightarrow 7n \
ightarrow 7n}$ red | $\boldsymbol{\leftarrow 8n \
ightarrow 4n}$ orange
5. which of the following represents unbalanced forces? | $\boldsymbol{\
ightarrow 5n \leftarrow 5n}$ blue | $\boldsymbol{\leftarrow 2n \
ightarrow 2n}$ yellow | $\boldsymbol{\
ightarrow 7n \
ightarrow 3n}$ purple
directions: calculate the net forces in the questions below.
6. $\boldsymbol{\
ightarrow 120n \
ightarrow 50n}$ | 125n to the right orange | 125n to the left yellow | 170n to the right blue
7. $\boldsymbol{\leftarrow 16n \
ightarrow 5n}$ | 11n to the right green | 11n to the left brown | 21n to the right pink
8. $\boldsymbol{\
ightarrow 10n \leftarrow 4n \leftarrow 7n}$ | 10n to the right red | 21n to the right orange | 1n to the left green
9. $\boldsymbol{\leftarrow 7n \leftarrow 7n \
ightarrow 14n}$ | a) 7n, right purple \
 b) 0n black \
 c) 28n, right green | 11. two students kick a soccer ball at the same time. student a kicks the ball with a force of 80n to the right. student b kicks the ball with a force of 25n to the left. calculate the net force. \
 a) 45n, right black \
 b) 35n, right orange \
 c) 55n, right sky blue
10. $\boldsymbol{\leftarrow 3n \leftarrow 4n \
ightarrow 5n}$ | a) 12n, right red \
 b) 2n, left yellow \
 c) 12n, left blue | 12. three dogs are pulling on a stuffed animal. dog a pulls with a force of 150n to the north. dog b (a much smaller dog) is pulling to the west with a force of 30n. dog c pulls with a force of 150n to the south. which dog will win the toy? \
 a) dog a green \
 b) dog b orange \
 c) dog c yellow

Accepted Answer

### Question 1
# Brief Explanations:
The net force is defined as the vector sum of all forces acting on an object. Applied force is a single force applied, normal force is a contact force perpendicular to a surface. So the sum of all forces is net force.
# Answer:
C. net force [dark blue]

### Question 2
# Brief Explanations:
Unbalanced forces have a non - zero net force, which causes a change in the motion (speed or direction) of an object. Equal in size and opposite in direction is a characteristic of balanced forces, and unbalanced forces do cause a change in motion.
# Answer:
C. causes a change in motion of an object [green]

### Question 3
# Brief Explanations:
Balanced forces are equal in magnitude and opposite in direction, resulting in a net force of zero and no change in motion. The other options describe effects of unbalanced forces.
# Answer:
A. equal in size, opposite in direction [red]

### Question 4
# Brief Explanations:
Balanced forces have equal magnitude and opposite direction (or same direction with equal magnitude? No, for linear forces, balanced forces in opposite directions have equal magnitude. In option A, 11N to the right and 11N to the left are equal in magnitude and opposite in direction, so net force is zero. Option B has two forces in the same direction (both right), so net force is 14N (unbalanced). Option C: 8N left and 4N right, net force is 4N left (unbalanced).
# Answer:
A. $\boldsymbol{\longleftarrow 11N\quad 11N
ightarrow}$ [white]

### Question 5
# Brief Explanations:
Balanced forces have equal magnitude and opposite direction. In option A (5N right and 5N left) and option B (2N left and 2N right) are balanced. Option C: 7N right and 3N right, net force is 10N right (unbalanced).
# Answer:
C. $\boldsymbol{7N
ightarrow\quad 3N
ightarrow}$ [purple]

### Question 6
# Brief Explanations:
Both forces are in the same direction (right). To find the net force, we add them: $F_{net}=120N + 50N=170N$ to the right.
# Answer:
C. 170N to the right [blue]

### Question 7
# Brief Explanations:
Forces are in opposite directions. We subtract the smaller from the larger: $F_{net}=16N - 5N = 11N$ in the direction of the larger force (left).
# Answer:
B. 11N to the left [brown]

### Question 8
# Brief Explanations:
First, find the net force of the left - directed forces: $4N+7N = 11N$ left. The right - directed force is 10N. Then, $F_{net}=11N - 10N=1N$ left.
# Answer:
C. 1N to the left [green]

### Question 9
# Brief Explanations:
Left - directed forces: $7N + 7N=14N$ left. Right - directed force is 14N. Net force $F_{net}=14N-14N = 0N$? Wait, no, wait the diagram: left forces are 7N and 7N (total 14N left), right force is 14N right. So net force is 0? But the options: A)7N right, B)0N, C)28N right. Wait, maybe I misread. Wait the left forces: two 7N left, so total left force $F_{left}=7 + 7=14N$, right force $F_{right}=14N$. Net force $F_{net}=F_{right}-F_{left}=14 - 14 = 0N$. So option B.
# Answer:
B. 0N [black]

### Question 10
# Brief Explanations:
Left - directed forces: $3N+4N = 7N$ left. Right - directed force is 5N. Net force $F_{net}=7N - 5N = 2N$ left.
# Answer:
B. 2N, left [yellow]

### Question 11
# Brief Explanations:
Force from A: 80N right, force from B:25N left. Net force $F_{net}=80N-25N = 55N$ right. Wait, the options: A)45N right, B)35N right, C)55N right. Wait $80 - 25=55$, so option C.
# Answer:
C. 55N, right [sky blue]

### Question 12
# Brief Explanations:
Dog A pulls 150N North, Dog C pulls 150N South. These two forces are equal in magnitude and opposite in direction, so their net force is 0. Dog B pulls 30N West. But since the North - South forces cancel, the only remaining force - related effect is from Dog B? Wait no, the question is which dog will win. Wait Dog A and Dog C have equal and opposite forces, so they cancel each other. Dog B is pulling West, but wait, maybe the question is about the resultant force. Wait no, Dog A (North) and Dog C (South) cancel. So the stuffed animal will move in the direction of Dog B? No, wait maybe I misread. Wait Dog A: North 150N, Dog C: South 150N (cancel). Dog B: West 30N. But the question is which dog will win. Wait, maybe the question is that after A and C cancel, there is no force in North - South, and Dog B is pulling West, but the options are Dog A, B, or C. Wait, no, maybe the diagram (not fully shown) has a coordinate system, and when A (North) and C (South) cancel, the toy is pulled by B? But the options: A)Dog A, B)Dog B, C)Dog C. Wait, no, maybe I made a mistake. Wait Dog A and Dog C have equal forces in opposite directions (North - South), so they balance. Dog B is pulling West, but the question is which dog will win. Wait, maybe the question is that since A and C cancel, the toy is not moving in North - South, and Dog B is pulling West, but the options are A, B, C. Wait, maybe the original question has a diagram where the resultant force after A and C cancel is zero, and Dog B's force is the only one, but the options: A)Dog A [green], B)Dog B [orange], C)Dog C [yellow]. Wait, no, maybe I misread the forces. Wait Dog A:150N North, Dog C:150N South (so net force 0 in North - South). Dog B:30N West. But the question is "which dog will win the toy?" Maybe the question is that after A and C cancel, there is no force in North - South, so the toy is pulled by Dog B? But the options: A)Dog A, B)Dog B, C)Dog C. Wait, maybe the answer is that since A and C cancel, and B is pulling West, but the options don't make sense. Wait, maybe I made a mistake in force directions. Wait, maybe the question is that Dog A (North) and Dog C (South) are equal, so they cancel, and there is no force in North - South, so the toy is not moving in that direction, and Dog B is pulling West, but the options are A, B, C. Wait, maybe the correct answer is that since A and C cancel, and B has a force, but the options: A)Dog A, B)Dog B, C)Dog C. Wait, maybe the answer is B)Dog B [orange]? But I'm not sure. Wait, maybe the original problem has a different interpretation. Alternatively, maybe the forces of A and C are equal, so they cancel, and the toy is pulled by B, so Dog B wins.
# Answer:
B. Dog B [orange]

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