Net Force - Balanced or Unbalanced?
Vocabulary
Units
Weight
Calculating Net Forces
100
What is net force?
The overall forces acting on an object.
100
Two forces equal in size and acting in opposite directions on an object.
Balanced Forces
100
The unit of acceleration
What is m/s/s or m/s2 ?
100
Also known as gravitational force.
What is weight?
100
3 N to the right
200
If the net force adds up to 0, are the forces balanced or unbalanced?
Balanced
200
A force that resists motion
Friction
(could also be drag)
200
The unit of force.
What is a newton?
200
The formula for determining weight.
What is Fg = mg?
(mass x gravitational field strength)
200
Who wins the tug of war with what net force?
The person on the left with 20 N.
300
If the net force does NOT equal zero, what should it equal?
What is mass x acceleration
300
A "downward" force exerted on everything that has mass by the earth
What is gravitational force? (gravity)
300
The unit of mass.
What is a kilogram?
300
9.8 N/kg
What is the gravitational field strength on Earth?
300
60 N to the right
400
If the net force does not add up to 0, are the forces balanced or unbalanced?
Unbalanced
400
A push or pull that is applied to an object by rope, string, chain or a wire.
What is tension?
400
The unit of weight.
What is a newton? (Weight is just a force.)
400
If John has a mass of 80 kg, then his weight (in newtons) will be
What is 784N?
(800 N is also acceptable)
400
40 N to the right
500
What is the net force between 400N and 552N going in opposite directions?
152N
500
An object that is at rest or moving with a constant velocity is said to be in this state.
What is equilibrium?
500
A kg x m/s2 is commonly referred to as this unit.
What is a newton?
500
Solve the acceleration of a 0.65 kg basketball falling towards the earth. As it falls, it experiences a small drag force of 0.9 N.
What is 8. 4m/s2 ?
If down is positive...
0.65 x 9.8 - 0.9 = 0.65 x a
5.47 = 0.65 x a
a = 8.4 m/s2
500
Which blocks WILL move?
Blocks B and C