1. Forces

2. What is a Force?
Force is a push or pull that changes an objects speed, direction, or shape/size. It is measured in Newtons (N). One (1) is equal to the amount of force required to accelerate 1 kg by 1 /s2
Draw an example of… Change in Speed Change in Direction Change in Shape or Size

3. How is Net Force Calculated?
What is Net Force?
Net force is the combination of all of the forces acting on an if the object is not moving.
PULL
PUSH
If the force acting on an object are in the same direction they add together to form the net force.
10N + 10N = 20N
10N
10N
If the force acting on an object are in the opposite directions the net force is the difference between the two forces and the object will move in the direction of the larger force.
PULL
PULL
10N
20N
20N - 10N = 10N 

4. Balanced and Unbalanced Forces
Forces are said to be balanced if their effects cancel each other out and there is NO CHANGE in the objects speed, direction, or shape.
Forces are said to be unbalanced if their effects DO NOT cancel each other and there IS A CHANGE in the objects speed, direction, or shape.
20-10 = 10N
 that direction
Net Force = 0
PULL
PULL
PULL
PULL
10N-10N = 0 Net Force
20N-10N = 10N 
10N
10N
20N
10N

5. What is Weight?

6. Weight!
An object’s weight is dependent upon its location. The Earth’s larger mass = a stronger gravitational pull than the moon’s.
Measuring weight not only depends on the acceleration due to gravity, but also the mass of the object.
More Mass = More Weight
The unit of measurement for weight is the Newton (N) 1 N is the amount of force required to accelerate 1 kg by 1 m/s2
Weight is the measurement of the force of GRAVITY on an object that has mass. It can be measured using a SPRING SCALE

7. Earth’s larger mass = More gravitational pull
What is Weight?
Mass in Never Lost
Calculating Weight
What is the weight of a 4 kg sack of potatoes on Earth? Weight = mass x 9.8 m/s2 Weight = 4 kg x 9.8m/s2 Weight = 39.2 kg x m/s2 (Newtons)
Mass = 120kg
Weight = 11769
Mass = 120kg
Weight = 194.6N
Earth’s larger mass = More gravitational pull