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Physics: Forces

Key questions on forces

QuestionAnswer
Define scalar quantity Magnitude no direction
Define vector quantity Magnitude and direction
What is a force? A push or pull
Define contact forces Forces that can only act when objects are touching
Define non-contact forces Forces that can act even when objects are not touching
State 4 examples of contact forces Friction, air resistance, tension, normal contact force
State 3 examples of non-contact forces Gravitational force, electrostatic force, magnetic force
What is weight? The force acting on an object due to gravity pulling on its mass
What is mass? The amount of matter in an object
What is the equation linking weight, mass and gravitational field strength? Weight = Mass x Gravitational field strength
What is the equipment used to measure weight (forces)? A Newton meter
Where does the weight of any object act from? The centre of mass
Define resultant force A single force found by adding all individual forces acting upon an object
How do you calculate resultant force? Subtract forces in opposite directions and add forces that head in the same directions
When is work done on an object? When a force moves it a distance in the direction of that force
How many joules is one newton meter? 1 joule
What happens to the temperature of an object when work is done against friction? It increases
What happens to an elastic object after the limit of proportionality? Elastic deformation
State the relationship between force and extension for an elastic object They are directly proportional
Write the equation linking force, spring and constant extension Force = spring constant x extension
Define spring constant The stiffness of a spring
Is distance a scalar or vector quantity? Scalar
Is displacement a scalar or vector quantity? Vector
Is speed a scalar or vector quantity? Scalar
Is velocity a scalar or vector quantity? Vector
What is displacement? A distance with direction
What is the typical value of walking speed? 1.5 m/s
What is the typical value of running speed? 3 m/s
What is the typical value of cycling speed? 6 m/s
Write the equation linking distance, velocity and time Distance = speed x time
33...
Created by: beth.dawkin
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