PHS 116
more than g
A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet is a. less than g, the acceleration due to gravity b. g c. more than g
275 lbs
A football recruit has a weight of 1250 N. How much does he weigh in pounds? a. 1250 lbs b. 125 lbs c. 566 lbs d. 275 lbs e. none of the above
90 N
A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then a. 5.5 N b. 90 N c. 500 N d. 45,000 N
0 N
A stone that weighs 10 N is dropped from a bridge and encounters 10 N of air resistance. The net force on the object is a. 0 N b. 10 N c. 20 N d. 100 N
1500 kg
A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s^2. What is the mass of the car? a. 500 kg b. 1500 kg c. 3000 kg d. 6000 kg e. none of the above
double
An object is propelled along a straight-line path by a force. If the net force were doubled, its acceleration would a. quadruple b. double c. stay the same d. halve
the one on the moon
An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? a. the one on the moon b. They have the same mass c. the one on earth d. not enough information to tell
Suzie
Arnold Strongman and Suzie Small have a tug-of-war on a polished floor. Arnold wears socks and Suzie wears gym shoes. The likely winner is a. Arnold b. Suzie c. neither, for they should be tied d. no basis for predicting
none of the above
Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has the same a. mass b. weight c. volume d. all of the above e. none of the above
35 m/s
How fast must a ball be thrown upwards to stay aloft for 7 seconds?
3000 m/s
If a rocket initially at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be a. 50 m/s b. 500 m/s c. 3000 m/s d. 3600 m/s e. none of the above
may change
In science, facts a. are absolute b. mean very little c. may change d. are more important than theories
3000 N
On the surface of Jupiter, where the acceleration due to gravity is about 3 times that of earth, a 100 kg rock would have a weight about a. 100 kg b. 300 kg c. 1000 N d. 3000 N e. none of the above
inertia
One object has twice as much mass as another object, and also has twice as much a. gravitational acceleration b. velocity c. volume d. inertia e. all of the above
the target would be safer than the shooter
Suppose a gun were made of a strong but very light material. Suppose also that the pellet is more massive than the gun itself. For such a weapon a. recoil problems would be lessened b. conservation of energy would not hold c. conservation of momentum would not hold d. the target would be safer than the shooter
20 km/hr
The average speed of a horse that gallops a distance of 10 km in a time of 30 min is a. 10 km/hr b. 20 km/hr c. 30 km/hr d. not enough information
terminal velocity
The speed at which the acceleration of a falling object terminates when air resistance balances the objects weight is a. free fall b. terminal velocity c. stop speed d. the ground
all of the above
Which has zero acceleration? a. at rest b. moving at constant velocity c. in mechanical equilibrium d. all of the above e. none of the above
friction
a natural force that decreases acceleration
law
a theory that has been continuously proven and is usually pretty basic
inertia
describes how an object in motion stays at motion
presupposition
stances without any backup
acceleration
the change in velocity
mass
the quantity of stuff something has
net force
the total amount of natural and violent motion acting on an object
newton
the unit of measure for force