physics forces waffle pt.1
What is the difference between a scalar and a vector ?
A scalar has magnitude only but a vector has direction and magnitude
Give examples of scalars.
Time, speed, distance, temperature.
Give examples of vectors.
Force, velocity, displacement, acceleration.
Describe the difference between a contact and non-contact force.
Contact forces act only when 2 objects are touching but non-contact forces do not require the objects to be touching to act.
Give examples of contact forces.
NCF, friction, tension, air resistence.
Give examples of non-contact forces.
Magnetic, gravitational, electrostatic.
What is the difference between mass and weight ?
Mass is a measure of how much matter is in an object. The mass is always the same for an object regardless of where it is. Weight is the force acting on an object due to gravity. The weight is depedent on gravitational field strength.
What is the weight equation ?
W=mg
What is the gravitational field strength on Earth ?
9.81 N/Kg
What is a resultant force ?
The overall force acting on an object.