Types of Forces, Motion, and Net Force

Types of Forces
Motion
Net Force

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