Basics
What is a force?
A push or pull
What is a contact force?
A force that requires two objects to be physically touching.
What is a non-contact force?
A force that does not require objects to be touching.
A boy drops a soccer ball from the top of a staircase. What non-contact force is responsible for pulling the ball downward?
Gravity.
What is the unit used to measure force?
The unit used to measure force is a newton.
What is friction?
Friction is a force that opposes motion between surfaces that are touching.
What is gravity?
The force of attraction between any two objects with mass.
A boy drops a soccer ball from the top of a staircase. What non-contact force is responsible for pulling the ball downward?
Friction.
What is a balanced force?
When all the forces on the object cancel each other out, the object will not change its speed or direction.
What is air resistance?
(extra 100 points if you can name what it's also known as)
Air resistance, also known as drag, is a force that opposes the motion of an object as it moves through the air.
What is magnetic force?
The attractive or repulsive force between magnets or a magnet and a magnetic material.
A small, powerful magnet is attached to a string and dangles just above a pile of paper clips. Without touching the paper clips, the magnet lifts them up. What kind of force is making this happen?
Magnetic Force.
When forces on the object do not cancel each other out which causes the object to move or change its motion.
What is applied force?
This is a direct push or pull on an object by an being or object.
What is electrostatic force?
A force that exists between 2 electrically charged objects. It can be attractive or repulsive.
A tug-of-war team pulls on a rope with the exact same amount of force as the opposing team. Will the rope move? Explain why.
The rope will not move because they are balanced.
What are the 5 things a force can do to an object?
Start moving from a resting position.
Stop moving.
Change its speed.
Change its shape.
Change its direction.
What is tension?
Tension is the pulling force that is transmitted through a flexible object like a rope.
Without touching it, how does a crane use a magnet to lift a car in a junkyard?
The magnet has its own magnetic field and uses magnetism ( a non-contact force) to lift the car.
A book is resting on a flat table. What force is the table exerting on the book to prevent it from falling through?
Normal Force.