2.2: Newtons Law Flashcards
State Newton’s First Law.
An object will remain at rest or in uniform motion in a straight line unless acted upon by an external resultant force.
State Newton’s Second Law.
Resultant Force = Mass x Acceleration
State Newton’s Third Law.
If body A exerts a force onto body B, body B will exert an equal and opposite force on body A.
What is inertia?
The reluctance of an object to move.
Describe the difference between weight and mass.
Weight is the expression of mass times the gravitational force whereas mass is the constant measure of how much material something is
How strong is the gravitational field strength of Earth?
1 kg = 10N
What is terminal velocity?
The maximum speed in a singular direction an object can go as it cannot accelerate further.
What is air resistance?
Air resistance comes as a result of particles not being able to move away from an object therefore hitting it and slowing it down. A larger surface area will have more air resistance.
Name some examples of resultant forces.
- Friction
- Uplift
- Thrust
- Air resistance
- Push or Pull
- Weight
What is the equation for kinetic energy?
KE = 1/2mv^2
What does the mass of an object dictate?
How easy it is to get the object moving or change its direction - the larger the object the greater the difficulty. This is intertia
What is the effect of balanced forces?
Nothing
What is the effect of unbalanced forces?
Movement or change
What happens if we double the resultant force?
The acceleration doubles
How can you describe the relationship between the resultant force and accelaration?
Proportional
