Weakest universal force, works over largest distances
gravity
1 kg m/s= ?
1 newton
An object in motion stays in motion until____________
an unbalance force acts on it
The input arm of the lever is 40 cm and the output arm is 60 cm. Does the lever increase or decrease the amount of force needed to lift the object?
Increase
Air resistance is an example of what type of friction?
Fluid friction
Which has more momentum, a 50kg roller skater traveling at a speed of 3m/s or an 80kg bicyclist traveling 2m/s?
bicyclist
What is the net force applied to the box?
-
A train car weighing 1000kg and traveling 2m/s bumps into a stationary train car of the same size. They stick together and continue moving. What speed are they moving at?
1 m/s
A person can exert 200N of force on an object that weighs 1000N. How long a ramp would they need to have to successfully raise the object to a height of 1 M?
5 m
A compound machine includes the following components:
ramp with a mechanical advantage of 3
3 pulleys
Wheel and axle with a mechanical advantage of 5
What is the total MA of the machine?
45
What forces hold the nuclei of atoms together?
Nuclear forces
Which is more powerful, a 2 horsepower engine or a 400 watt motor?
2 hp (1500 watts)
How can you reduce the impulse of a collision?
increase the collision time
reduce the speed of the object
A machine has an IMA of 8 and an AMA of 6. What is it's efficeincy?
75%
What is the total mechanical advantage of a 1 meter ramp and 3 pulleys that raise an object to a height of .5 meters.
6