Fill in the gap
________ is a force that always opposes motion.
Friction
There are two types of friction.
True
Why does it get harder for a car to accelerate the faster it goes?
Generally, fluid friction increases with velocity.
What is the unit of measurement used to describe the force with which a planet attracts us?
Newtons
fudli oirctfni
fluid friction
The _____ __ _______ acts at a distance between two bodies that have mass.
force of gravity
A light-year is the speed that light travels in one year.
False. A light-year is the distance that light travels in one year.
Why is it difficult to drag objects?
Solid friction is what happens when two solid bodies come into contact. Due to the irregularities of the bodies that come into contact, it is difficult to drag objects.
What is the gravitational strength of the Earth and the Moon?
Earth: g= 9,8 m/s2
Moon: g= 1,6 m/s2
ectlirce ocfer
electric force
_____ _______ is what happens when two solid bodies come into contact.
Solid friction
Pushing furniture is more difficult on rough surfaces.
True.
Describe one situation where friction is advantageous.
Example: Car tires must grip the road in curves.
US English: Tires
UK English: Tyres
How fast does light travel?
Light travels at 300000 km/s
sitcta etcyirlceit by uocidntin
static electricity by induction
______ is the force with which a planet attracts us.
Weight
When certain insulating materials are rubbed against each other they become electrically charged.
True
Why is it unviable to measure distances in space using kilometers?
Distance in space are so large it is easier to use the travel time as a reference.
How many poles does a magnet have? Can you describe the poles in more detail?
A magnet has two poles, north (N) and south (S), like poles repel and unlike poles attract. It only effects certain metals like iron.
istcta teeciriytcl by ttacnoc
static electricity by contact
When two bodies are charged, an ________ force appears between them.
Electric
False. An electric force is repulsive between charges of the same sign, and attractive between charges of different sign.
How does a compass function?
It functions as a pointer to "geographic north" because the magnetized needle at its heart aligns itself with the Earth's magnetic field.
Can you describe magnetic force?
Magnetic force acts at a distance and decreases when the distance increases. It can be attractive or repulsive.
attsci iyeiclttcer yb bbguinr
static electricity by rubbing