Gravity
What's the gravitational field strength on Earth?
10 or 9.8
What is the unit of force?
The Newton
Which equation summarises Newton's 2nd Law?
F = ma
What is the standard unit of speed?
m/s
What is the unit for electrical resistance?
What is the unit of gravitational field strength?
N/Kg
Which of these is NOT a force: magnetism, GPE, tension, gravity.
GPE (Gravitational Potential Energy)
If an object has a constant velocity of 0m/s, we say it is at ____?
Rest
What's the momentum of a 500g toy car moving at 20m/s?
10kg m/s
Which colour of visible light has the longest wavelength?
Red
Assuming g is 9.8, what would a pineapple of mass 2000g weigh on Earth?
19.6 Newtons
If I push down on a table, what is the name of the force that is pushing back up?
Reaction or normal force.
According to Newton's Third Law, all forces come in opposing pairs. If an apple is hanging from a string, gravity is pulling downwards. What's the other force in this pair?
Tension
Airbags in cars are designed to increase which variable?
The time taken to stop
How many electrons does an atom of hydrogen have?
1
On Planet X, a spaceship has a mass of 5000kg and weighs 1000N. What is the gravitational field strength of Planet X
0.2N/kg
An object has two forces acting on it. One is 56N to the right, the other is 78N to the left. What is the resultant vertical force?
0
A cat dropped out of a plane experiences a force due to gravity. At some point the air resistance will equal this force. What do we call this point?
Terminal velocity
"How much force is required to stop a 1000kg truck moving at 10m/s?"
This question is impossible to answer. Why?
We need to know how quickly we want it to stop.
What is the definition of a light year?
On the International Space Station, gravity is approximately 80% as strong as it is on Earth. Why do the astronauts on it appear to be floating?
ANSWER: They are in F____ F___
They are in free fall.
The Earth exerts a force of 2 x 1020N on the moon. The moon is approximately four times smaller than the Earth. What force does the moon exert on the Earth?
2 x 1020N
A small potato has a force of 0.06N applied to. It accelerates by 2m/s2. What is the mass of the small potato in grams?
30g
A woman throws a tennis ball vertically up into the air. Ignoring air resistance, what is its acceleration?
-9.8m/s2
What do we call the subatomic particles that make up protons and neutrons?
Quarks