A 4kg object moving at 10m/s has the same kinetic energy as a 1kg object moving at ______ m/s.
20m/s
100
What is work?
Force x distance OR change in kinetic energy
100
What is the momentum of a 20kg object at rest?
0kg*m/s
100
A bullet is fired and becomes lodged in a block of wood. This is an example of a(n) ______________ collision.
inelastic
200
Energy due to position is called this
gravitational potential energy
200
Doubling the change in kinetic energy will do what to the WORK?
double
200
What is work divided by distance?
Force
200
A 10kg object moving at 5m/s is brought to rest. What's the impulse?
-50kg*m/s
200
Two billiard balls colliding is an example of a(n) ______ collision.
elastic
300
the sum of the kinetic and potential energies is called this
mechanical energy
300
Bringing a 10kg rock to a planet with 1/6 of Earth's gravity will do what to the rock's gravitational potential energy?
1/6
300
Amount of work done when 4 Newtons of force is applied to a 4kg object which doesn't move.
0
300
A 0.5 kg ball moving at 3m/s strikes a wall, bouncing back at 2m/s. What's the impulse?
2.5 kg*m/s
300
True or False: Momentum is conserved in both elastic and inelastic collisions.
True dat.
400
The kinetic energy of a 10kg rock moving at a rate of 3m/s is ____________.
45J
400
Tripling the velocity will do what to an object's kinetic energy?
9x
400
Amount of time it takes to do 500 Joules of work using 5 Watts of power.
100s
400
A 1600kg car moving at 5m/s hits a stationary 1800kg car. Coupled up, the two move off together. What's their final velocity?
2.35m/s
400
True/False: Kinetic energy is conserved in both elastic and inelastic collisions.
False
500
A big rock that has 20,000J of gravitational potential energy when it is 10m off the ground has THIS weight.
2000N
500
Airbags ________ the time to decelerate, _______ the force of impact, and the impulse ________.
(Choose from decrease(s), increase(s), or stays the same)
increase, decrease, stays the same
500
The amount of power it takes to lift a 10kg object up 5 meters in 50 seconds.
10W
500
A 0.16kg white billiard ball moving at 1m/s strikes a 0.16 red billiard ball moving at -1.5m/s. The white ball has a final velocity of -0.5m/s. What's the red ball's final velocity?
0m/s
500
A 1200kg roller coaster car begins at an initial height of 100 meters. After it descended to its lowest point (where h = 0), what is its velocity? (Assume no energy is lost to heat.)