Forces
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What does an object’s weight represent and what is it measured in?
An object’s weight represents the gravitational force acting on it. It’s measured in Newtons.
Does Weight change?
Yes.
Does Mass change and what it is measured in?
No, mass is measured in kg.
What is the mathematical formula for Force.
Fg= m x g
What does (g ) represent in forces?
The gravitational constant.
What is the gravitational constant on Earth?
9.8 N/kg
At a construction site, a crane’s platform is in equilibrium in the air overnight. The platform is suspended from the crane by a steel cable. How is it possible for the platform to be in equilibrium?
The weight of the platform is equal to the force exerted by the steel cable.
What is a force?
A push or pull.
What is a net force?
A sum of all the forces acting on an object.
A plane has 85 N moving to the right and 100 N moving to the left. What is the net force?
15 N to the left.
What is the formula for speed?
S= d/t
What are the two units for speed?
m/s or km/h