Physics 001 chapter 4.2

A force is a vector quantity because it has both

magnitude and direction

The maximum acceleration of a car while towing a second car twice its mass, compared to its acceleration with no car in tow, is

one third

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?

1500 kg

A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car?

2000 N

A girl pulls on a 10 kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in meters per second per second?

3.0

If the mass of an object does not change, a constant net force on the object produces constant

acceleration

When you relax at rest with your left foot on on bathroom scale and your right foot on a similar scale, each of the scales will

any of the above

Which has zero acceleration? An object

at rest, moving at constant velocity, in mechanical equilibrium

Whenever the net force on an object is zero, its acceleration

is zero

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

increases

A 10 N falling object encounters 10 N of air resistance. The net force on the object is

0 N

An apple weighs 1 N. When held at rest above your head, the net force on the apple is

0 N

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is

1 N

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

10 N

A 10 kg brick and a 1 kg brick are dropped in a vacuum. The force of gravity on the 10 kg brick is

10 times as much

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is

5 N

A 10 N falling object encounters 4 N of air resistance. The net force on the object is

6 N

A 1 kg mass at the Earth's surface weighs

9.8 N

Your car is coasting on a level ground at 60 km/hr and you apply the brakes until the car slows to 40 km/hr. If you suddenly release the breaks now, the car tends to

continue moving at 40 km/hr

An object is propelled along a straight path in space by a force. IF the mass of the object somehow becomes twice as much, its acceleration

halves

If a non-rotating object has no acceleration, then we can say for certain that it is

in mechanical equilibrium

An object is propelled along a straight line path by a force. If the net force were doubled, the object's acceleration would be

twice as much