AQA Combined Science forces flash cards
AQA Combined Science forces flash cards
What is a scaler quantity?
Only has a size (magnitude)
What is a vector quantity?
Has both a size and direction.
What is a force?
A push or pull that acts on an object due to the interaction with another object.
Is force a vector or scaler quantity?
Vector.
What is a contact force?
When objects are physically touching (friction, air resistance, tension, normal contact force)
What is non-contact force?
when objects are physically separated (gravitational, electrostatic magnetic)
What is the same about the interaction pair of forces when two objects interact with each other?1
The forces are the same size.
What is different about the interaction pair of forces when two objects interact with each other?
Forces are in opposite directions.
What is the size of the resultant force on an object if the forces on it are balanced?
Zero.
What is the name for the force acting on an object due to gravity?
Weight.
What instrument can be used to measure the weight of an object?
Calibrated spring-balance (newton meter)
What is centre of mass?
The point through which the weight of an object can be considered to act.
What is elastic deformation?
An object can go back to its original shape and size when deforming forces are removed.
What is inelastic deformation?
An object does not go back to its original shape and size when deforming forces are removed.
How do you find the spring constant form a force-extension graph of a spring?
finds the gradient of the straight-line section.
What is the difference between distance and displacement?
Distance is a scaler quantity and only has a magnitude (size), Displacement is a vector quantity and has both magnitude and direction.
What is the difference between speed and velocity?
Speed is a scaler quantity and only has a magnitude, velocity is a vector quantity and has both magnitude and direction.
What factors can affect the speed at which someone walks, runs, or cycles?
Age, fitness, terrain, and distance travelled.
What are typical speeds for a person walking, running and cycling?
1.5m/s, 3.0m/s and 6.0m/s, respectively.
What are typical speeds of a car and train?
13-30m/s and 50m/s
What is a typical speed for sound travelling in air?
330m/s
What is acceleration?
Change in velocity of an object per second.
What is the unit of acceleration?
m/s
How can an object be accelerating even if it is travelling at a steady speed?
If it is changing direction.
