8.5.1 (Term 1) Flashcards
Glossary Gravity Mass Weight Terminal Velocity Objectives The terms mass, weight, inertia and momentum. Formulae for weight and momentum. SI units for mass, weight and momentum. That weight varies according to the position of an object relative to the earth (or other large mass!)
What factors affect the size of the gravitational force between two objects?
The size of the gravitational force depends on the mass of both objects and the distance between them.
Why do we usually only notice gravity when one object has a large mass?
When a object is large enough it exerts enough gravity to be noticeable.
What can be said about the forces of attraction between the Earth and skydivers?
The forces of attraction between the Earth and skydivers are equal and opposite.
Why does the Earth not move towards the skydivers in a noticeable way?
The Earth has a much greater mass, so the force pulling the skydivers toward the Earth has a much larger effect than the force pulling the Earth toward the skydivers.
What is the weight of an object?
Weight is a measure of the force of gravity on an object.
What is the SI unit for weight?
The SI unit for weight is Newtons (N).
How is weight calculated?
Weight is calculated by the formula: weight = mass Ć gravity.
What is the value of gravity on Earth?
On Earth, gravity (š) equals 9.8 m/sĀ².
What is mass?
Mass is a measure of the amount of matter in an object.
Is mass constant?
Yes, mass is constant.
What is the SI unit for mass?
The SI unit for mass is kilograms (kg).
What is the formula for calculating weight?
Weight = mass Ć gravity.
What happens to objects of different masses when air resistance is ignored?
Ignoring air resistance, objects of different masses fall with the same acceleration due to gravity.
