Energy
The two types of nonrenewable energy
The definition for Work is the amount of ______
What is energy transferred?
The greater power is A kettle that can use 3000J per minute or a kettle than can use 3000J every 30 seconds
3000J every 30 seconds
If you push a box with a 5N force to the right and a friend pushes with a 5 N force to the left. The box experiences forces.
what is balanced forces
Unit for pressure
what is the Pa (Pascal)
What is the formula for calculating kinetic energy?
Ke = 1/2(m)(v)2
Name an example of mechanical work and electrical work
What is pushing a cart and lighting a house
What is the formula for power
Power = change of energy over time
What is the formula for calculating force
F = m x a
What is Bernoulli's Principle
What is the energy store when 2 clouds are oppositely charged electrically and they come together
electrostatic
A gardener pushes a wheelbarrow with 200 N of force for 15 m. How much work does she do?
What is 3,000 J
What is the units for power
Watts
If a 10 kg object accelerates at 2 m/s22 \, m/s^22m/s2, what is the amount of force acting on it is this
20N
If an object's buoyant force is greater than its weight, the object will
float
This renewable energy source relies on underground reservoirs of steam and hot water, but it is only practical in regions near tectonic plate boundaries
Geothermal Energy
A crane lifts a 1,200 N steel beam straight up 15 m. At the same time, a worker pushes with 200 N horizontally, but the beam doesn’t move sideways. How much total work is actually done on the beam?
What is 18,000 J? (Only the upward force contributes; horizontal work = 0)
A cyclist is metabolising energy in their body at a rate of 51kJ per minute. They are pushing the pedals of the bicycle with a power of 200W. What is the efficiency of the cyclist’s body when pedalling?
51000J/min = 51000/60 = 850W
A rocket of mass 5,000 kg accelerates upward at 9.8 m/s2. How much net force is acting on it?
49,000N
As you climb a mountain, the pressure exerted on you by the atmosphere
decreases
A scientist holds a 0.56 kg hammer at a height of 1.62m. If gravity equals 10 m/s2, what is the GPE?
0.56 x (10) x 1.62 = 9 J
A worker pushes a crate with a force of 500 N, but it only moves 0.5 m before stopping. Compare the work done here to the work done if the crate had moved 5 m
250 J for 0.5 m and 2,500 J for 5 m
An elevator moves between the ground floor and first floor in 6s. If the elevator requires 5715 J of work to be able to reach the first floor. How much power is required to lift the elevator to the first floor?
(5715) / 6 = 952.5W
According to Newton’s Second Law, if the net force on an object doubles while its mass stays the same, this happens to the object’s acceleration.
What is the acceleration also doubles?
The principle that allows you to determine whether an object will float.
What is Archimede's principle