Topic 2 - Forces & Motion -Forces Flashcards
What is the name given to the single force that is equivalent to all the other forces acting on a given object
The resultant force
State Newton’s first law for an stationary object
If the resultant force on a stationary object is zero, the object will remain at rest
State Newton’s first law for a moving object
If the resultant force on a moving object is zero, the object will remain at constant velocity (same speed in the same direction)
State the defining equation for Newton’s second law
F = m x a
State Newton’s second law in words
An objects acceleration is directly proportional to the resultant force acting on it and inversely proportional to its mass
State Newton’s second law in words
An objects acceleration is directly proportional to the resultant force acting on it and inversely proportional to its mass
What is weight
The force acts on an object due to gravity and the objects mass
What quantities does weight depend on
Weight = mass x gravitational field strength
The objects mass
The gravitational field strength at the given position in the field
What is the unit used for weight
Newton ( N )
What is the unit used for gravitational field strength
N/kg
What piece of equipment can be used to measure an objects weight
A calibrated spring- balance or newtons-meter
