GCSE 2 - Forces and Motion Flashcards
How do you find distance and acceleration in a speed-time graph?
The distance is the area under the graph.
The slope represents acceleration. A steep slope means high acceleration, a horizontal line means no acceleration.
How do you find speed and acceleration on a distance-time graph?
The gradient is the speed.
A straight gradient means no acceleration, curving up is acceleration and curving down is deceleration.
What is the difference between speed and velocity? H
Velocity is speed in a particular direction. It is therefore possible to have a negative velocity.
What is the resultant force?
The overall force on an object which moves it in a particular direction.
What happens if a resultant force acts upon a moving object?
The object will speed up or slow down.
What happens when a resultant force acts upon a stationary object?
The object will speed up.
What happens when the forces are balanced on a stationary object?
The object remains stationary.
What happens when the forced are balanced on a moving object?
The object moves at a constant rate.
What is the difference between mass and weight? How do you go from one to the other?
Weight is a downwards force (N) while mass is the matter an object is made of (kg).
Weight = mass x gravity (10 on Earth)
What is terminal velocity?
Terminal velocity is the maximum constant speed which an object can reach on gravity alone.
What is inertia?
Inertia is a body’s ability to resist movement.
A large, fast object will resist slowing down, while a small light object will easily move.
What is Newtons First Law?
An object at rest, stays at rest. An object in motion carries on travelling at the same speed and in the same direction unless acted upon by an unbalanced force.
What is Newtons Second Law?
The acceleration of an object is directly proportional to the resultant force and inversely proportional to the mass.
What is Newtons Third Law?
When object A puts a force on object B, object B puts an equal and opposite force on object A
How are GE and KE linked?
As GP decreased, KE increases. When one is at its maximum, the other is at its minimum.
