Physics KS3 Forces (in order) Flashcards
What is a force?
A force is a push or pull that acts on an object
Forces are measured in ……. (units)
Newtons or N / (N must be uppercase)
To measure a force the instrument you use is a …….
newtonmeter or forcemeter or spring balance
Sometimes the two bodies must be touching for the force to be present these are called ……. forces.
Contact
Sometimes one body can have an effect on another without having to be in contact, these forces are known as ……. forces.
Non-contact
Description: Forward push of an object moving on a solid surface – Name the force and state whether contact or non-contact
Thrust/Forward force / Contact
Description: Attraction (pull towards) or repulsion (push away) of magnets and magnetic materials – Name the force and state whether contact or non-contact
Magnetism/Magnetic / Non-contact
Description: Attraction between two objects with mass (Gravity) – Name the force and state whether contact or non-contact
Weight / Non-contact
Description: Upward push of water on an object – Name the force and state whether contact or non-contact
Upthrust / Contact
Description: Upward push of a solid surface on an object – Name the force and state whether contact or non-contact
Normal contact / Contact
Description: Force which slows objects moving along a solid surface – Name the force and state whether contact or non-contact
Friction / Contact
Description: Force which slows objects moving through water – Name the force and state whether contact or non-contact
Water resistance/drag / Contact
Description: Force which slows objects moving through air – Name the force and state whether contact or non-contact
Air resistance/drag / Contact
Description: The force pushing up on an object as it moves through the air, caused by differences in air pressure. – Name the force and state whether contact or non-contact
Lift / Contact
Description: Forces caused when objects eg springs, string are stretched/compressed – Name the force and state whether contact or non-contact
Tension/Compression / Contact
Which force is represented by the arrows around the third car?
Air resistance
Which force is represented by the red arrow? (The hand is pushing the mug forwards.)
Friction
Which force are the elephant and the lorry exerting on each other?
Gravity
Which force is represented here?
Water resistance
How can friction between solid objects be reduced?
Lubrication eg oil on bike chains or wax on snowboards
How can drag forces such as water resistance or air resistance be reduced?
Streamlining/use streamlined shapes
If you’re talking about how much of a substance there is, are you talking about Mass or Weight?
Mass
If you’re talking about a force, are you talking about Mass or Weight?
Weight
If you’re talking about something measured in Newtons, are you talking about Mass or Weight?
Weight
If you’re talking about something that changes from planet to planet, are you talking about Mass or Weight?
Weight
If you’re talking about the kg, are you talking about Mass or Weight?
Mass
If you’re talking about the Newton/N, are you talking about Mass or Weight?
Weight
If you’re talking about something that doesn’t change from planet to planet, are you talking about Mass or Weight?
Mass
Remember that Weight = Mass x Gravitational Field Strength. If Mass = 1kg and Gravitational Field Strength = 10 N/kg, what is Weight?
Weight= 1 x 10 = 10 N
Remember that Weight = Mass x Gravitational Field Strength. If Mass = 0.1kg (100g) and Gravitational Field Strength = 10 N/kg, what is Weight?
Weight= 0.1 x 10 = 1 N
Remember that Weight = Mass x Gravitational Field Strength. If Mass = 0.2kg (200g) and Gravitational Field Strength = 10 N/kg, what is Weight?
Weight= 0.2 x 10 = 2 N
Remember that Weight = Mass x Gravitational Field Strength. If Mass = 2kg and Gravitational Field Strength = 2 N/kg, what is Weight?
Weight= 2 x 2 = 4 N
