Forces Flashcards
What are the units for density?
kg/m3
What is density
The amount of mass in a volume
Which state of matter is the densest?
Solid
What is the name of the equipment you would use to measure the volume of a solid by using water?
Displacement can
Describe mass
Mass is a measurement of the amount of matter, measured in kg.
Describe weight
Weight is a Force caused by a Mass in a Gravitational field.
How to calculate weight
mass x gravitational field strength
Why must there be a resultant force acting an object moving in a circle?
The object is constantly changing direction so its velocity is changing
What is the name of the force acting on an object moving in a circle?
Centripetal force
Describe the velocity of an object moving in a circle.
The object is constantly changing direction so its velocity is changing
State Newton’s second law in terms of momentum.
Force = change of momentum / time taken
What is Newton’s third law?
When Two Objects Interact, the forces they exert on each other are equal & opposite
What does equilibrium mean?
The Forces are BALANCED so the RESULTANT FORCE is ZERO
When two bodies interact, what can you say about the size and direction of the action and reaction force?
Equal and opposite
State the conservation of momentum.
The momentum before the collision will be the same as the momentum after the collision.
State calculation to find momentum.
Mass x velocity
Three factors that increase thinking distance of a car
High speed, tiredness, drugs alcohol
Three factors that increase braking distance of a car
High speed, worn tyres, worn brakes.
What two factors make up the overall stopping distance of a car?
Thinking distance and braking distance
Explain how air bags, crumple zone and seatbelt reduce injury
1) Increase the time taken for the object to stop
