Forces
Is friction a contact or non-contact force?
Contact
Is mass or weight dependent on gravity?
Weight
Is magnetism a contact or non-contact force?
non-contact
What are the components of an electromagnet?
Electric current (e.g. battery), wire coil, metal core (e.g. nail)
Name three simple machines
wheel and axel, lever, pulley, inclined plane, screw, wedge
What is a non-contact force?
A force between objects not in physical contact
Does gravitational force strengthen or weaken when distance increases?
Weaken
Give an example of a permanent magnet
Bar magnet, horseshoe magnet, fridge magnets, compass needles
In a balanced force, will the objects move or remain stationary?
Remain stationary, the forces are equal
What simple machine is a drill?
screw
How are forces represented in diagrams?
With arrows
Do greater masses have smaller or greater gravitational forces?
greater
Do unlike poles attract or repel?
Attract
If an arrow labelling a force is longer than any other arrow on the diagram, is that force the smallest or largest?
Largest
How many machines is a compound machine made from?
two or more
What forces are acting on a pen sitting on a table? Hint: there are two
Gravitational and normal
If you mass is 40kg on Earth, what is it on the moon?
40kg
What is a device humans use to navigate, that involves using Earth's magnetic field?
Compass, GPS etc.
What can be used/done to reduce friction between two objects?
What simple machine is used in flag poles?
What are the two characteristics of an unbalanced force?
Forces that are NOT equal in size and do cause a change in motion
What is the full name of the scientist who coined the theory of gravitational force?
Isaac Newton
What does a temporary magnet need to be magnetised?
An external force, an already existing magnetic field
Name two every day appliances that use electromagnets
speakers, headphones, doorbells, cars, MRIs etc.
What element is in the middle in a second class lever?
load
Name five types of forces
normal, applied, gravitational, magnetic, friction etc.
What is are mass and weight measured in?
kilograms (kg) and newtons (N)
In which direction do magnetic field lines travel?
From the north to the south pole
Give an example of wanted friction, and an example of unwanted friction
various answers
What simple machine is an axe?
wedge
What force slows down objects when they are falling from a height?
Air resistance
If you move from Earth to the Moon, will your weight change, and why?
Yes, weight is dependent on gravity, which differs between planets/celestial bodies
Give an example of animals using Earth's magnetic field for navigation
Birds navigating, Butterflies migrating
What can change the strength of electromagnet?
Number of coils, strength of electric current, material of metal core etc.
what does it mean when a machine has a mechanical advantage?
It has made the task easier
What feature of the sun allows it to have such a strong gravitational pull?
It's large mass
What class of lever is a seesaw?
first
What other type of machine is a screw?
inclined plane