Types of Forces, Motion, and Net Force

Types of Forces
Motion
Net Force

Fill in the Blank

Force is a ___________ OR ____________.

Fill in the Blank

What is the unit used for the measurement of force?

Fill in the Blank

What is the sum of all the forces acting on an object?

Fill in the Blank

What is the change in the position, direction, or location of an object?

Fill in the Blank

Forces affect how objects move. They may cause motion; they may _____. (write one)

Multiple Choice

______ is a force that involves the attraction or repulsion between two objects.

• gravity

• friction

• applied force

• tension

• magnetism

Multiple Choice

______ is a noncontact force. It is an attractive force that exists between all objects that have mass.

• gravity

• friction

• applied force

• tension

• magnetism

Multiple Choice

______ is a contact force that is applied to an object by a person or another object.

• gravity

• friction

• applied force

• tension

• magnetism

Multiple Choice

______ is the force that is transmitted through a string, rope, cable, or wire when it is pulled tight by forces acting from opposite ends.

• gravity

• friction

• applied force

• tension

• magnetism

Multiple Choice

______ is a contact force that resists the sliding motion of two surfaces that are touching.

• gravity

• friction

• applied force

• tension

• magnetism

Multiple Choice

Forces can cause objects to

• stop moving only.

• start moving only.

• start moving, change direction, or stop moving.

• change direction only.

• ​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

Multiple Select

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

(Hint: select two options)

• 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