7: Physics Terms Flashcards
(23 cards)
What are the basic examples /terms of forces?
Push, Pull & Twist.
What can a force effect?
The objects shape or motion.
What units are used to measure forces?
Newtons.
What is common device used to measure forces?
A spring balance.
What is a contact force?
A contact force is a force that requires contact between two surfaces/substance sin order to act upon one
What is an example of a contact force?
Friction, Kicking a Ball
What is a non-contact force?
A non-contact force is a force that can affect a substance or object without touching them. No contact is needed.
What is an example of a non-contact force?
Gravity, Magnetism
Briefly Define Gravity
Gravity is the force of attraction between objects of mass.
How does increasing the mass or distance between two objects effect the gravitational pull?
Increasing the mass of an object increases its gravitational pull (attraction to other objects). Increasing the distances decreases the gravitational pull.
Briefly define Normal Force
Normal Force is the force exerted from solids that prevents them from passing through each other.
Briefly define Lift.
Lift is the total of all forces acing on an object that causes that object to go perpendicular to the flow surrounding it.
Give an example of lift.
An aeroplane (the flow is horizontal) and the shape of the plane causes lift to occur making it go upwards as well ad forwards.
Briefly define Buoyancy.
An upwards force exerted by water causing objects to float.
Briefly Define Tension.
Tension is the stress applied to a substance due to the forces acing on either end of the object itself.
Give an example of Tension.
A rope in tug of war.
Briefly Define Drag.
Drag is the force that resists an objects forward motion or direction. It is similar to friction.
What are balanced forces?
Balanced forces are forces that a re opposite in direction but same in size and shape. This means that the object does not undergo a change in shape or motion.
What are unbalanced forces?
Unbalanced forces are forces that are opposite in direction but different in size. This means that an object changes its motion or shape.
How are weight and mass different?
Weight is subject to gravitational pull, and this changes from where you are in relationship to gravitational fields surrounding you. Mass is the amount of atoms in something.
What are some methods of decreasing friction?
Smoother Surfaces, Using lubricants, Reducing the available surface area
What are some methods of increasing friction?
Rougher surfaces, Enlarging the available surface area.
What is the expression for calculating weight?
Weight = Mass x Gravitational Pull
