Work is the net force X the displacement X the angle between them
100
What is the formula for Kinetic Energy?
KE = 1/2 m v^2
100
Gravitational Potential Energy is always measured with respect to what?
A zero level.
100
Mechanical Energy is defined as?
KE + the sum of PE
100
Is Momentum a Vector or Scalar quantity?
Vector
200
How much Work is done on a box pulled by a force of 10N, and distance of 5m, at an angle of 60 degrees?
W = 25J
200
Is Kinetic Energy a Vector or a Scalar quantity?
Scalar
200
Name 2 different types of Potential Energy.
Gravitational, Elastic, Chemical
200
Is power a vector quantity or a scalar quantity?
scalar
200
When comparing 2 objects, is it true that the object with the higher velocity will always have a higher momentum?
No.
300
If 4J of Work is done lifting a 100g object, how far was the object lifted?
d = 4.08m
300
An 80kg person riding a bike goes from a speed of 1m/s to a speed of 2m/s, how much does their KE change?
120J
300
A spring has a spring constant of 1N/m, it has a relaxed length of 1m and is stretched to a length of 2m, What is the Elastic Energy of the spring?
0.5J
300
A 3.00 kg toy falls from a height of 1.00 m. What will the kinetic energy of the toy be just before the toy hits the ground? (Assume no air resistance and that g = 9.81 m/s.)
KE = 29.4J
300
A 2000kg car is driving at a speed of 50/s to the west, what is it's momentum?
p = 100000kgm/s
400
In the following sentence, is the everyday meaning or the scientific meaning of work intended?
A bulldozer does work lifting a load.
Scientific
400
What is the Work - Kinetic Energy Theorem?
The net Work equals the change in Kinetic Energy
400
A spring has a spring constant of 105N/m, it is compressed 0.15m, what is the Elastic Potential Energy of the spring?
PE = 1.18J
400
Why doesn’t the principle of mechanical energy conservation hold in situations when frictional forces are present?
Kinetic energy is not completely converted to a form of potential energy.
400
A 1kg car is traveling at 10m/s to the east. It strikes a tree and is brought to rest in 0.5s, what is the force on the car?
F = -20000N
500
A 50 kg car travels at a constant speed of 25 m/s on a 500m flat stretch of road. What is the net work done on the car?
0
500
Two identical objects are traveling, one with a speed of 5m/s, and the other with a speed of 10m/s. What is the ratio of their Kinetic Energies?
4/1
500
A 1kg box sits on a 5m high table. If the box is lifted up 2 more meters, what is it's Gravitational Potential Energy with respect to the table?
PE = 19.6J
500
A skier starts from rest at the top of a 2m hill, what is the skiers velocity at the bottom of the hill? (disregard friction)