Forces Basics
A force is defined as one of these 2 types of action that affects an object’s motion.
What is a push or pull?
The force that pulls all objects toward the center of the Earth.
What is gravity?
The force that resists motion when two surfaces rub against each other.
What is friction?
If a skydiver opens their parachute, this force increases and slows them down.
What is air resistance?
When an object is moving at constant speed, the forces acting on it are in this state.
What is balanced?
The measurement unit for force.
What is a Newton?
The force that acts through a rope, string, or cable when pulled tight.
What is tension?
This force pushes against a moving object through air or water, slowing it down.
What is air resistance?
When riding a bike, this force makes it harder to pedal on a gravel road than on pavement.
What is friction?
If an object’s speed or direction changes, this must be happening to the forces acting on it.
What is they are unbalanced?
A force that acts only when two objects are physically touching.
What is a contact force?
The force that allows an object to float in a liquid or gas.
What is buoyant force?
The force that prevents a book from falling through a table.
What is the normal force?
When a skydiver reaches terminal (max) velocity, these two forces are balanced.
Air Resistance and Gravity
If a book sits motionless on a table, these two forces are balanced.
What are gravity and the normal force?
A force that acts on an object without touching it.
What is a non-contact force?
The force that occurs when a stretched or compressed material returns to its original shape.
What is spring force?
The force that is applied to an object by a person or another object.
What is applied force?
A boat is floating on water but not moving. These two forces are equal and opposite.
What are gravity and buoyant force?
A person pushes a box across the floor at a constant speed. These two forces must be balanced.
What are applied force and friction?
An object at rest remains at rest unless acted on by this.
What is an unbalanced outside force?
The force that prevents objects from passing through solid surfaces.
What is normal force?
A magnet attracts a paperclip without touching it due to this force.
What is magnetic force?
Fill in the blanks: If a ball is rolling on a surface and no forces act on it, the ball will continue moving at the same __ and in the same __.
What is it will continue moving at the same speed and in the same direction?
A person pulls on a rope attached to a box, but the box doesn’t move. This means these two forces are equal.
What are tension and friction?