Unbalanced and Balanced Forces/Net Force

Review

​Some text here about the topic of discussion.

​SC.6.P.13.3

Some text here about the topic of discussion

• ​change in motion.

  • unbalanced force can be in opposite directions or the same direction​

​When forces are unbalanced

• motion is constant

• there is no motion​

​When forces are balanced

​Balanced and Unbalanced Forces

balanced forces are equal. unbalanced forces are not equal​

100N​

75N​

75N​

75N​

Multiple Choice

Which of these is evidence that an unbalanced force is acting on an object?

• The mass of the object is changing

• The object remains at rest.

• The motion of the object is changing

• The object continues moving in a straight line at constant velocity.

​When forces are unbalanced, the net force > 0

​When forces are balanced the net forces = 0

​Net force is the SUM of all forces acting on an object

balanced forces are equal. unbalanced forces are not equal

100N​

75N​

75N​

75N​

​the Newtons that are going in the SAME DIRECTION

​​Add

​ the Newtons that are going in the OPPOSITE DIRECTION

​

​​Substract

​How to calculate Net Force

​

​Remember:

1. Determine the direction and magnitude of each individual force first​

2. when subtracting, subtract the smaller number from the larger number

​LET'S DO SOME PRACTICE

Open Ended

What is the magnitude AND direction of each individual force?

Open Ended

Are these forces acting in the same direction or opposite direction?

Open Ended

To find the net force, will we add or subtract?

Multiple Select

What is the net force (direction and magnitude) on this object?

• 4N

• Left

• Right

• 0N

• No direction since the forces are balanced

Multiple Choice

What is the net force (direction and magnitude) acting on the box?

• 30N, right

• 30N, left

• 5N, left

• 25N, left

Multiple Choice

What is the net force (direction and magnitude) acting on the box?

• 100N, left

• 90N, right

• 100N, right

• 140N, right

Multiple Choice

Looking at all four boxes, which box is experiencing a net force of 0N?

• A

• B

• C

• D

Multiple Choice

Looking at the boxes, which box is experiencing a net force of 3N, down?

• A

• B

• C

• D

Multiple Choice

The following picture shows forces acting on a sneaker. Suppose that the sneaker is moving toward the spring scale.

Based on evidence in the picture, in which direction is the sum of all the forces (the net force) acting?

• The net force is acting in an upward direction.

• The net force is acting in a downward direction.

• The net force is acting to the left.

• The net force is acting to the right.