Forces 1
instrument used to measure force
spring scale
Attractive force existing between all objects with mass.
gravity?
Forces are measured in what ?
Newtons
There is NO MOTION. what force is it?
Balanced forces
symbol for force
N
an interaction between objects:
force
Forces acting on an object that do not cause the object to move.
balanced forces?
Forces acting on an object that cause the object to move.
unbalanced forces?
WHAT IS A FORCE?
a push or a pull
The net force that does not equal zero that acts on an object.
unbalanced forces
the ability to apply force over a distance
energy
Measure of the amount of gravity on an object.
weight
Sum of all forces acting on an object.
net force?
An apple falls from a tree and is now sitting on the ground. What forces are now acting on it?
Gravity pulling down and the ground pushing up.
Little Johnny is pulling a sled by applying 100N of force. His brother starts pulling the other direction and Little Johnny starts moving backwards. How much force is his brother applying?
More than 100N
If I roll a ball on ice and its starts to slow down, is there still motion being applied?
YES. Until it completely stops moving, there is still a force acting on it to make it move.
A force going to the right at 300 N, an opposite force going to the left at 500N, the net force, and direction are______.
200N to the left
_____ is a force that resists the sliding motion between two objects that are touching.
friction
As the amount of mass increases, the force of gravity between two objects _______.
Would increases?
An object will not change its motion unless _______________________.
a force acts on it.
This person used ball-and-ramp experiments as evidence to support his ideas about friction and force
Galileo
The greater the mass of an object,
A.the easier the object starts moving.
B. the greater force needed to move it.
C. the less gravity affects it.
D.the more space it takes up.
B
Net force acting on an object is 0N.
balanced forces
This person made the earliest observations about motion but his explanations were incomplete
Aristotle
For every action (force) in nature there is a(n) _______________________ reaction.
equal and opposite