A force is defined as this
Push or a Pull
This occurs when two object rub against each other
Friction
What's heavier? 1000 kg of feathers or 1000 kg or iron?
They're the same weight having the same mass.
Force that pulls objects towards each other
Gravity
What keeps the Moon in orbit around the Earth and the planets in orbit around the sun?
Gravity
Force is measured in this
Newtons
List three ways in which friction can be reduced. Give an example of each method.
If you were to land on Mars, what would change?
A) Your mass
B) Your weight
C) Both your mass and your weight
D) Neither your mass or your weight
Weight
The amount of matter in an object
Mass
Every object in the universe pulls on other objects with a force of gravity. True or false?
True
Magnetic force is what type of force?
Non-contact force
Are wider tyres better than narrow ones?
Wider tyres create more friction; however, they consume more fuel. Narrow tyres create less friction but consume less fuel. There is no objectively better type; preference will depend on the situation for which they are being used.
How does it affect your driving when the tread is worn away and the tyres are ‘bald’?
When the tread is worn, less friction is created, making it more difficult to control the car around tight bends or in wet weather.
The measure of the force of gravity on an object
Weight
What does affect the force of gravity?
A) Weight
B) Place
C) Size
D) Mass
The force of gravity towards an object depends on its mass
Give at least 2 types of non-contact forces or contact forces
Magnetic, Electrostatic, Gravity
or
buoyancy, friction
This type of friction occurs when birds fly in the air
Fluid Friction
Name the three forces acting on a water spider when it is standing on a still pond.
Gravity, buoyancy and surface tension.
These two things affect gravitational pull
Mass and Distance
Air in the atmosphere pushes against all falling objects. This push force is called what?
Or: what is this an example of?
Air resistance
Fluid friction
Quinn pushes a box to the right with 5 N and Shandelle helps push to the right also with 7 N. This is the net force
12 Newtons
The two factors that affect friction
Surface and Force
If every object pulls on other objects with a force of gravity, explain why you don’t notice objects being attracted to you.
Explain why small & light objects such as leaves or insects do not sink when on the surface of water
The water is held in shape by surface tension. Surface tension is the pulling of particles in a liquid towards each other.
Soaps and detergents reduce the surface tension of water.
Explain the difference between mass and weight
Mass is the amount of matter in an object, while weight is the force of gravity on it.
That's why astronauts make big leaps with every step, because they weigh less without having lost any mass. The Moon has smaller gravitational pull because its mass is smaller than Earth's.