Science - Physics - Forces Flashcards
What unit is used to measure forces?
Newtons (N)
What is a force?
A force is a push, pull or turn.
Describe a balanced force.
All forces on an object are equal if The object is at rest
or
All forces on an object remain constant if the object is moving.
A balanced force has no effect on an object.
What will be the effect of an unbalanced force on an object?
An unbalanced force will make an object
Speed up
Slow down
Or change direction.
What 2 elements do forces have?
A size
A direction
How do you find the resultant (overall) force on an object?
Add up all the forces acting on the object.
Forward forces are a positive number and backward forces are a negative number
What is the resultant force if forward and backward forces are balanced?
0
A moving object has a resultant of 0N. An unbalanced force in the same direction of the motion acts on the object. What is the effect?
The object speeds up.
A moving object has a resultant of 0N. An unbalanced force in the opposite direction of the motion acts on the object. What is the effect?
The object slows down.
Define ‘support force/normal force/reaction force’. (Similes)
A force that is equal but opposite to the weight of an object. E.g. A table under a book.
What piece of equipment is used to measure forces?
A Newton Meter
What is friction?
Friction is a force that acts in the opposite direction to a moving object.
What is a vacuum? (Yeah, yeah, NOT the cleaner! Sigh)
An artificial environment in which the air resistance is removed.
Define mass.
Mass is a measurement of how much of something there is.
Define weight.
Weight measures force.
