Kinematics
Force
Energy
Units
Potpourri
100
If a car accelerates from 0 to 30 m/s in 5 seconds, what is its acceleration?
6 m/s2
100
A 1-kg mass is hung by a rope from a 2-kg mass, and they are dropped from a tall building. While the masses are in freefall, what is the tension in the rope?
zero
100
A 100-kg man climbs a 5-meter ladder. By how much does his potential energy increase?
4900 J
100
What unit can be expressed as 9.87 x 10-6 atmospheres?
pascal (Pa)
100
What quantity is defined as "force times time"?
impulse
200
A car moving at 20 m/s stops after travelling 80 m. What was its acceleration?
-2.5 m/s2
200
When a car goes around a flat turn, what force supplies the centripetal force?
static friction
200
The work done by what kind of force changes the total mechanical energy of a system?
nonconservative
200
1 kg/m3 = ? g/cm3?
1000 (103)
200
A tower will fall over when what point is outside its base of support?
center of gravity/mass
300
A car is slowing down and turning right. Its radial acceleration is equal to its tangential acceleration in magnitude. What is the angle between its velocity and acceleration vectors?
135o
300
In the movie Pulp Fiction, femme fatale Mia Wallace once starred in what failed television pilot?
Fox Force Five
300
A cart moving at 1.0 m/s crashes into a fixed spring and compresses it by 1.0 cm before coming to rest. If the cart were moving at 2.0 m/s, how much would it compress the spring?
2.0 cm
300
What is a watt in terms of fundamental units (kg, m, s)?
kg m2/s3
300
Draw the acceleration vector for the roller coaster car.
points down and to the left
400
Draw the position vs. time graph corresponding to this velocity vs. time graph.
400
A car of mass m is parked on an incline of angle θ. What is the force exerted by the parking brake?
m g sin θ
400
A 40.0-W lightbulb consumes how much energy if it is left on for an hour?
144000 J (1.44 x 105 J)
400
What has the same units as the square root of the product of energy and distance?
(linear) momentum
400
Within 50 years, in what year did the first European set foot in what is now California?
1542
500
A ball rolls off a table 82 cm high and hits the floor 2.0 m away from the edge of the table. How fast was it moving when it left the table?
5.0 m/s
500
Bob pulls on a wheeled cart (weight: 200 N) with a pulling force of 150 N at an angle of 35 degrees above the horizontal. What is the acceleration of the cart?
6.0 m/s2
500
A 1.0 kg cart moving at 3.0 m/s collides with and sticks to a 2.0 kg cart (which is initially stationary). How much energy is lost during the collision?
3.0 J
500
What quantity is measured in kg m2/s?
Angular momentum
500
A uniform plank (1.00 meter long, weighing 20.0 N) is supported by two sawhorses, one at the left end, and one placed 0.200 m from the right end. What are the forces the sawhorses exert on the plank?
7.5 N, 12.5 N