forces and motion

what’s the unit for force

Newton

how do forces appear

when two objects interact together

what is force

action of one body on a second body

what does unbalanced force cause

changes in speed, shape, direction

what is a newton

force required to give a mass of 1kg an acceleration of 1m/s²

what is air resistance

friction action on an object moving through air

what is friction

force that acts when two surfaces run over one another

what is drag

force that acts on an object as it moves a fluid

what is solid friction

resistance to motion caused when two surfaces are in contact

what is a good example of drag increasing thermal and kinetic energy

meteor

what happens when breaks in a car are applied

provides solid friction

what happens when standing still on concrete surface

solid friction impeding motion

will a driver need a higher or lower force to stop the car

higher

how can force be represented on paper

with arrows

what is weight

a force

what force acts on something that was dropped

gravity

what is the name given to the gravitational force acting on an object that has mass

weight

what is weight measured in

newtons

what is gravity

force that exists between any two objects with mass

what is weight

force exerted on an object due to gravity

what is 1kg in Newtons

9.8N

what pulls with a force of 9.8N per kg

gravity

why does every object near/on Earth have weight

caused by force of attraction from Earth’s gravity

which ball reaches the ground first? 1kg ball or 5kg ball

they will reach at the same time

why does every object fall at the same acceleration on the Earth’s surface

Earth pulls with the same force per kg

what is acceleration of free fall

acceleration of an object falling freely under gravity

what is acceleration due to gravity

acceleration of an object falling freely under gravity

what is 9.8m/s²

free fall

what symbol is given to free fall

g

what symbol is newtons

N

what do we need when calculating weight

mass and gravitational field strength

what is gravitational field strength

force exerted per unit mass placed at a point

which weight more? 5kg on moon, 5kg on earth

5kg on earth

which has more mass? 5kg on moon or 5kg on earth

both are the same

what is mass of an object

how much matter an object is composed of

what is weight of an object

gravitational force that acts on an object

how does weighing an object on a balance give its value

compares to standard weight on other side of balance

what is true about two objects weighting the same

same mass

what do parachutes make use of

air resistance

what increases with the speed of motion

air resistance

what is terminal velocity

the greatest speed reached by an object moving through a fluid

how do we know something has reached terminal velocity

it stopped accelerating

what happens when a person falls out a plane

accelerate downwards

what happens when a parachute is opened

air resistance increases

how does a parachute work

balances weight and air resistance slowing you down

why would you want to increase parachute area

to reach a slower terminal velocity

what would happen when your parachute area increases

air resistance increases

what does this graph show

terminal velocity