Work
True or False: Work involves a force and distance
True
What is Energy?
Property of system that enables it to do work or cause change.
What is momentum?
A vector quantity and is directional but it can be canceled.
True or False: Energy can be created and destroyed.
False
How many things are involved for work to occur?
The total energy due to its position, motion, or both.
Mechanical Energy
Does momentum happen everyday? If so, give some examples.
Moving vehicles, thrown baseball, walking, karate, balloons, etc.
What two things are conserved during an elastic collision?
Momentum and kinetic energy.
How is work done?
When a force causes an object to move a certain distance.
The energy an object has due to its motion. That energy is...
Kinetic Energy
What happens to the sled if you push it down a hill?
The sled will gain momentum as it accelerates to a higher speed. The change in momentum is by its mass and change in velocity.
What happens to momentum and kinetic energy during an inelastic collision?
Momentum is conserved and kinetic energy is lost.
If you are pushing against a wall, you are doing no work on...
The wall
Give 3 examples of energy:
Kinetic Energy, Potential Energy and Mechanical Energy
Which vehicle has more momentum at the same speed? Truck or bicycle? Explain.
The truck has more momentum at the same speed because of its greater mass.
Is a hammer and nail a collision? If so, explain.
Yes, because the hammer applies force to the nail embedding it into the surface.
When you're walking up the stairs, you are... (explain)
Stored Energy held by an object in its position that can be converted into other forms of energy. That energy is...
Potential Energy
What happens when two football players collide with different speeds? Explain.
The one with faster speed will knock away the other player because they have a greater momentum.
What is a collision?
When two or more objects collide or exert force on each other for a short time causing an exchange in momentum.