Forces Flashcards
What is a balanced force?
An equal push on both sides of an object which results in no change in motion
What is an unbalanced force?
An unequal push on one side of an object which results in a change in motion
The force that resists motion when two surfaces rub against each other
Friction
What does friction generate?
Heat
All forces are measured in…
Newtons (N)
List some examples of contact forces
Friction
Air resistance
Reaction Force
Upthrust
What is a force?
A push or a pull
The force of water pushing a boat up is called…
Upthrust
A force that acts without touching is called a…
Non-contact force
What do we use to measure force?
Newton Meter
How do we show forces acting on an object?
We add arrows to it
What effect can forces have on objects?
Change their shape (deform)
Change the direction the object moves in
List 3 non-contact forces
Gravitational force
Magnetic force
Electrostatic force
What is the scientific word for changing shape?
Deform
When a stretched string pulls back we call it…
Tension
The force of the Earth pushing an object up is called the…
Reaction force
The amount that a spring can stretch is called its…
extension
If you stretch a spring so long that it can no longer go back to its original size we say that the spring has reached its…
elastic limit
If an object (e.g. a spring) doubles in length when you double the force on it we say that it obeys…
Hooke’s Law
True or false, rough surfaces have more friction
True
Smooth surfaces have ____ friction
less
Name the two drag forces.
Air resistance
Water Resistance
How do you reduce friction between 2 objects?
Lubrication E.g. oil
What is weight?
The force that an object (or person) pushes into the Earth as a result of gravity
What is mass?
The amount of stuff that an object is made from
What is the equation for weight on any planet?
Weight (N) = Mass (KG) x Gravitational Field Strength (N/kg)
What are the names of the 3 types of force field?
Magnetic fields
Gravitational fields
Electrostatic force fields
When forces acting on an object are the same size in opposite directions we say that they are…
Balanced
If forces acting in opposite directions are not the same size, we say that they are…
Unbalanced
