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