Forces
A force is either . . .
a push or a pull.
Who first coined the term 'gravity'
Sir Isaac Newton
Friction is...
Is a force that stops motion?
The difference between an unbalanced force and a balanced force is...
Balanced net force is equal to zero and an unbalance force is not.
Explain in terms of forces why objects float
Upthrust is more than weight.
The SI unit used for force is...
Newton.
Gravity means . . .
All objects with mass attract each other
When showing an object in motion, friction is shown using arrows that go in this direction...
The opposite direction of the force.
solve for the net force of the following: 25N North and 35N South
Objects less dense than water wil . . .
float
The direction and strength of a force can be shown by an __________.
Arrow.
The gravity force of an object on can also be called . . .
Its weight
Friction due to falling objects...
Air friction
A man falling with constant speed using a parachute . . .
has a balanced force of weight and air friction
Explain in terms of forces why do objects sink.
Weight is more than upthrust
Combining all forces acting on an object is called ....
Net Force
Weight's direction is always . . .
Downwards.
What are the two factors that influence air friction?
Surface area and speed of the object.
Balanced forces make objects . . .
Not move or move with a constant speed
Objects more dense than water will . . .
sink
To solve for net force equations we have to...
Add all the forces in the same direction and subtract the forces in opposite directions
Mass and Weight are often confused with one another. In reality, though, they are really different. Why?
Mass is how much of a material there is weight is the force on that mass due to gravity.
How can we make air friction less?
Smaller surface area
Move Slower
Unbalanced force make objects . . .
move faster or slower
Another term for upthrust.
Buoyancy force