P8: Forces Flashcards
What is a scalar quantity?
A quantity with magnitude only
What is a force?
A push or a pull that acts on an object due to the interaction with another object
What are 3 examples of contact forces?
Friction, air resistance and tension
What are 3 examples of non-contact forces?
Gravitational force, electrostatic force and magnetic force
What type of quantity is force?
A vector
What is weight?
The force acting on an object due to gravity
What is the formula for weight?
W = mg
What is the relationship between weight and mass?
They are directly proportional
What instrument is used to measure weight?
A calibrated spring balance
What is the resultant force?
The single force that has the same effect as all the original forces acting together
What is the equation for work done?
W = Fs (distance)
What is one joule equivalent to?
One newton meter
What is the moment?
The turning effect of a force
What is the equation for a moment? What is its unit?
M = Fd in Newton meters
What does Newton’s First Law state?
If the resultant force acting on a stationary object is 0, it will remain this way. Similarly, if the resultant force acting on a moving object is 0, it will move at the same velocity throughout