Simple Machines
Energy
Energy Conversions
Work
Power
100
Name a simple machine
lever, ramp, pulley, wheel and axle
100
What are the 2 types of Mechanical Energy?
Potential and Kinetic
100
The kind(s) of energy a Nerf gun on the ground has before you pull the trigger.
What is spring potential energy
100
The units of Work
What is Joules?
100
The units of power
What is Watts?
200
What is the efficiency of a machine that requires 100J of energy to do 50 Joules of work?
50%
200
What are the 2 types of Potential Energy
Chemical, Elastic, and Gravitational
200
The energy the nerf dart has just after the trigger is pulled.
What is kinetic energy?
200
The formula for work
What is force x distance?
200
The formula for power
What is work / time?
300
After a car is raised in a service station, we say the car has increased what
gravitational potential energy
300
What is the formula to find Kinetic Energy (KE)?
KE= 1/2m x V2
300
The kind of energy that a baseball has when it has been thrown in the air and it has just reached it's maximum height.
What is gravitational potential?
300
It's how much work is done when you push a box 3.0 m with 20 N of force.
What is 60 J?
300
How much power is expended if you lift a 60 N crate 10 meters in 1 second?
600 watts
400
What is the mechanical advantage of these Pulleys
1 & 3
400
When a car’s speed triples, its kinetic energy
increases by nine times]
KE= 1/2m x V2
400
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot?
70J
400
It's how much work is done when a 10 kg mass is lifted 5.0 m.
What is 490 J
400
How much power is required to do 40 J of work on an object in 5 seconds?
8 Watts
500
Whats the mechanical advantage of this ramp
MA 3
500
If I carried a 10N rock up off the ground 5 meters and then dropped it what would be its KE right before it hit the ground?
KE=50J
500
What is the efficiency of her body when a cyclist expends 1000W of power to deliver mechanical energy to the bicycle at the rate of 100W?
10%
500
If you lift one load two stories, how much do you do compared to lifting one load up only one story?
twice as much
500
Person A and Person B are competing against each other, they both can lift 75 kg boxes 3.5 m off of the ground. Person A lifts her box in 1.5 s and Person B lifts his box in 2.4 s. Which person uses more power??
What is Person A