Newton's Laws & Force
This law says that Force = Mass × Acceleration.
Newton's Second Law
This pulls you toward the Earth.
Gravity
In a lever, the place where it turns is called this.
Fulcrum
This is the unit we use for energy
Joule (J)
Formula for weight.
P = m × g
This is the unit of force.
Newton (N)
The formula P = m × g helps you find this.
Weight (or force of gravity)
In a lever, this is the force you use to lift something.
Power
When energy moves from one place to another, it is called this.
Energy transfer
Formula for force.
F = m × a
If a car has a mass of 1,000 kg and accelerates at 3 m/s², how much force is acting on it?
3,000 N
If you have a mass of 50 kg on Earth (g = 9.8), how much is your weight?
490 N
The distance from power to the fulcrum is called
power arm (Bₚ)
Energy can’t be made or destroyed. It can only do this.
Change form (transform)
In a lever: P × Bₚ =?
R × Bᵣ
This force slows things down when they rub against each other.
Friction
This stays the same on the Moon or Earth, but your weight changes
Mass
The lever rule: P × Bₚ = R × Bᵣ. What do R and Bᵣ stand for?
Resistance and resistance arm?
When energy is lost (like sound or heat that can’t be used), we say it has:
Dissipated
If a car has a mass of 500 kg and accelerates at 4 m/s², what is the force?
2,000 N
You need more force to move a truck than a bicycle. Why?
Because the truck has more mass (and needs more acceleration)
Which one changes: weight or mass
Weight
If power is 10 N and its arm is 2 m, and resistance arm is 4 m, what is the resistance?
5 N
A light bulb turns electrical energy into light and heat. This process is an example of:
Energy transformation and energy dissipation
If an object weighs 98 N and gravity is 9.8 m/s², what is its mass
10 kg