Identifying Forces
Contact Forces
Noncontact Forces
Balanced/Unbalanced Forces
Newton's Laws
100
What is a force?
A force is a push or a pull.
100
What is a contact force?
A push or pull by one object on another that is touching it. (e.g. hammering a nail, pushing a swing)
100
What is a noncontact force?
When one object applies a force to another without touching it (e.g. magnets, gravity)
100
What is Net Force?
The total forces acting on an object
100
Name the law: An object in motion will stay in motion, and an object at rest will stay at rest, unless an unbalanced/outside force acts on the object.
Newton's 1st Law
200
Kicking a soccer ball is an example of a push or pull?
Push
200
What type of energy does friction typically create?
Thermal energy
200
True or False: Gravity is a noncontact force?
TRUE
200
___________________ force occurs when there are two forces that are NOT equal in size and act in opposite directions
Unbalanced force
200
What is the tendency of an object to resist a change in its motion?
Inertia
300
What is an applied force?
An object directly pushing or pulling on another object. (What we normally think of as a force)
300
What is static friction?
Friction that prevents surfaces from sliding past each other. (The object will not move)
300
How can two objects attract each other without touching?
Magnetism (magnetic force such as between a magnet and metal)
300
______________ forces occur when two forces are equal in size and act in opposite directions on an object.
Balanced forces
300
Name the Law: If a small car and a large train are going the same speed, the car is easier to stop because....
Newton's 2nd Law. The car has less mass.
400
What is friction?
Friction is a contact force that resists sliding motion of two surfaces that are touching.
400
What is sliding friction?
Resistance in motion of surfaces sliding past each other. (The object moves but friction makes it difficult to push/pull)
400
Do you weigh more on Earth or on the moon? Why?
You weigh more on Earth because there is more gravity pulling down on you.
400
Which figure below represents a balanced force?
Top (300N left, 300N right)
400
Name the Law: For every action, there is an equal and opposite reaction.
Newton's 3rd Law
500
What is an example of a force? What kind of force is it?
Multiple responses
500
What is fluid friction?
Friction between a surface and a fluid like air or water.
500
This noncontact force helps operate a compass and know which direction is North.
Magnetism helps a operate a compass (Earth's magnetic field).
500
What is the net force in the diagram below? Are the forces balanced or unbalanced?
Net Force = 300N - 100N
Net Forces = 200N Left
The forces are unbalanced
500
You and your 4 year old cousin collide during bumper cars. Who will travel further after the collision?
Your 4 year old cousin will travel further after the collision because they have less mass than you.