What are Forces?
What unit are forces measured in?
newtons (N)
What are the two main groups (types) of forces?
Contact and non-contact forces
True or False: Gravity is a force that repels objects
False: it is a force that can make objects attract (only)
What is Newton's first name?
Isaac
Name one space agency around the world
NASA (USA), ESA (Europe), JAXA (Japan), RSF (Russia), CNSA (China), ASA (Australia)
A push, a pull or a twist that is exerted on an object is an example of .......?
A force
Name one thing that frictional force ALWAYS does (hint: you learnt three)
Frictional forces always generate some heat
Frictional forces always act in the opposite direction of the motion of the object.
Friction will always try to slow an object down.
What is your weight in 2G?
2x your normal weight (2x the normal force of gravity)
What is Newton's 2nd Law?
F=ma
Who owns SpaceX? What country is it based in?
SpaceX is a private USA company founded and co-owned by Elon Musk that is based at Kennedy Space Centre. First private company to send people into space
True or False: Looking through a telescope is an example of applying a force
False, no force is being applied.
Name the four non-contact forces
Magnetic force, electrostatic force, centripetal force, and gravitational force
What formula can you use to calculate your weight?
Weight (N) = mass (kg) x gravity (N/kg)
Which law is this? "For every action there is an equal and opposite reaction"
Newton's 3rd Law
What are three factors a good rocket needs to overcome to take flight?
Inertia, gravity force, Air resistance
An empty softdrink can is crushed. The effect of the force is to:
change the shape of the object
When astronauts jump on the moon, they fall back to the surface much slower than on Earth. Why?
Because the moon's gravitational pull isn't pulling them back as much as that on Earth.
Why do pilots black out under increased G-force?
It can cause blood to drain from the brain and causes them to black out
Is inertia a type of force?
No, is the tendency for things to keep doing what they are doing.
Where is the centre of gravity and centre of pressure located on a rocket? Why?
In order for a rocket to flu successfully (on a stable flight path), it must have its centre of gravity in front of its centre of pressure. (Cg positioned at fins)
What is an example from everyday life of you applying a force? What is the effect of the force?
Effect: start an object moving, stop an object moving, speed an object up, slow an object down, change direction, change shape, etc.
Why is friction useful in a car? What would happen without it?
When a car slows down, the friction between the road and the tires helps to bring the car to a stop as the wheels slow down. (form of resistance)
As an asteroid approaches Jupiter, the asteroid's mass _____ and weight _____.
stays the same; increases
Why do cannons recoil when shot?
The cannon exerts a forwards force on the cannonball, causing it to move forwards rapidly. (Action)
The cannonball exerts an equal backwards force on the cannon, causing it to move backwards rapidly. (Reaction)
What is the benefit to an aerodynamic design in a rocket?
Reduces the amount of drag. The nose cone and fins of a rocket are designed to minimise drag (air resistance) and to provide stability and control (keep it pointing in the right direction without wobbling).