Question

color by number net force
name: la sawan
date: 6/26/20 per: 6
directions: answer each question by circling the correct choice. after you have completed all of the questions, color the picture using the assigned colors.
question 1. the sum of all forces acting on an object is known as...
choice a: applied force (purple)
choice b: net force (black)
choice c: normal force (green)
question 2. which of the following is a characteristic of a balanced force?
choice a: equal in size, opposite in direction (red)
choice b: causes a change in the direction of an object (sky - blue)
choice c: causes a change in the motion of an object (orange)
question 3. which of the following is a characteristic of an unbalanced force?
choice a: equal in size, opposite in direction (sky - blue)
choice b: does not cause a change in the motion of an object (green)
choice c: causes a change in the motion of an object (purple)
question 4. which of the following represents balanced forces?
choice a: 7n→ 7n→ (purple)
choice b: 11n→ 11n← (sky - blue)
choice c: 8n← 4n→ (orange)
question 5. which of the following represents unbalanced forces?
choice a: 7n→ 3n→ (orange)
choice b: 5n→ 5n← (purple)
choice c: 2n 2n (yellow)
directions: calculate the net force in the questions below.
question 6. 16n← 5n→
choice a: 12n to the left (orange)
choice b: 11n to the left (yellow)
choice c: 21n to the left (blue)
question 7. 120n→ 50n→
choice a: 125n to the right (green)
choice b: 125n to the left (sky - blue)
choice c: 170n to the right (pink)
question 8. 10n→ 4n← 7n←
choice a: 7n to the left (red - orange)
choice b: 21n to the right (orange)
choice c: 1n to the left (yellow - green)
question 9. 7n← 7n← □ 14n→
choice a: 0n (red)
choice b: 7n, right (purple)
choice c: 21n, right (green)
question 10. 3n← 4n← □ 5n→
choice a: 2n, right (red)
choice b: 12n, right (purple)
choice c: 2n, left (blue)
question 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 45n to the left. calculate the net force.
choice a: 45n, right (brown)
choice b: 35n, right (orange)
choice c: 40n, right (yellow)
question 12. three dogs are pulling on a stuffed animal. dog a pulls with a force of 150n to the north. dog b pulls with a force of 150n to the south. dog c (a much smaller dog) is pulling to the east with a force of 40n. which dog will win the toy?
choice a: dog a (red - orange)
choice b: dog b (yellow)
choice c: dog c (green)

Explanation:

Step1: Define net - force

The sum of all forces acting on an object is the net force. So for question 1, the answer is B. net force.

Step2: Recall balanced - force characteristics

Balanced forces are equal in size and opposite in direction. For question 2, the answer is A. equal in size, opposite in direction.

Step3: Recall unbalanced - force characteristics

Unbalanced forces cause a change in the motion of an object. For question 3, the answer is C. causes a change in the motion of an object.

Step4: Identify balanced forces

Balanced forces have equal magnitudes and opposite directions. In question 4, the forces in option B ($11N$ and $11N$ in opposite directions) are balanced. So the answer is B.

Step5: Identify unbalanced forces

Unbalanced forces have unequal magnitudes. In question 5, the forces in option A ($7N$ and $3N$) are unbalanced. So the answer is A.

Step6: Calculate net force for question 6

The forces are $16N$ to the left and $5N$ to the right. Taking left as negative and right as positive, the net force $F_{net}=- 16N + 5N=-11N$, which means $11N$ to the left. The answer is B.

Step7: Calculate net force for question 7

The forces are $120N$ and $50N$ both to the right. The net force $F_{net}=120N + 50N = 170N$ to the right. The answer is C.

Step8: Calculate net force for question 8

The forces are $10N$ to the right, $4N$ to the left and $7N$ to the left. $F_{net}=10N-(4N + 7N)=10N - 11N=-1N$, which means $1N$ to the left. The answer is C.

Step9: Calculate net force for question 9

The forces are $7N+7N = 14N$ to the left and $14N$ to the right. The net force $F_{net}=-14N + 14N = 0N$. The answer is A.

Step10: Calculate net force for question 10

The forces are $3N + 4N=7N$ to the left and $5N$ to the right. $F_{net}=-7N + 5N=-2N$, which means $2N$ to the left. The answer is C.

Step11: Calculate net force for question 11

Student A exerts a force of $80N$ to the right and student B exerts a force of $45N$ to the left. $F_{net}=80N-45N = 35N$ to the right. The answer is B.

Step12: Analyze forces in question 12

Dogs A and B exert equal and opposite forces ($150N$ north and $150N$ south) which cancel each other out. Dog C exerts a $40N$ force to the east. So Dog C will win the toy. The answer is C.

Answer:

1. B. net force
2. A. equal in size, opposite in direction
3. C. causes a change in the motion of an object
4. B.
5. A.
6. B. 11N to the left
7. C. 170N to the right
8. C. 1N to the left
9. A. 0N
10. C. 2N, left
11. B. 35N, right
12. C. Dog C