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What are the 2 main forces acting on a sky diver
Gravity and air resitance
The net force of a falling object when it reaches terminal velocity (constant speed) would be
Zero
If the weight of the TV is 650 N what would be its mass?
65 KG
What is the weight of the table if the mass is 17kg (on earth)
170 N
Are the forces  balanced or unbalanced ?
unbalanced
What is the net force
10N
Give an example of a non contact force
Gravity, magnetic, electric
Give an example of a contact force
friction, air resistance, tension
What is a push or a pull resulting from two objects interacting?
A force!
The units to measure force are called
newtons
What is the force that opposes (resists) the motion of an object?
friction
If two north poles of magnet are pointed to each other, they will
 
repel
 
repulse
 
repair
 
attract
A south pole and a north pole on magnets will
 
attract
 
repel
 
absorb
 
extend
The number of variables that are changed in a science investigation (a fair test)
 
one
 
none
 
as many as possibe
 
three
The variable that is changed in a science experiment is called
 
the independent variable
 
the dependent variable
 
the control variable
 
the best variable
the variable that is measured in a science experiment
 
dependent variable
 
independent variable
 
control variable
 
best variable
The variables that are kept the same in the experiment are called
 
control variables
 
independent variables
 
dependent variables
 
variables
T/F When forces acting on an object are balanced,the object must be stationary
false
T/F the forces acting on a car that is speeding up must be unbalanced
true
Balanced or unbalanced? Book sitting on a desk
balanced
Balanced or unbalanced? Ball flying through the air
unbalanced
Balanced or unbalanced? rocket orbiting at a constant speed
balanced


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