Exam 3: Force and Motion

If an object of mass 8 kg has a velocity of 7 m/s, what is its linear momentum?

An automobile travels due north with a constant speed of 81 km/h. All forces considered, the unbalanced force acting on the auto is

To increase the force of gravity between two masses by a factor of 9, how would the objects have to be moved?

An automobile with a mass of 2000 kg is moving north on a level, straight highway with a constant velocity of 80 km/h. What is the unbalanced force acting on the automobile?

To cause an object to move in a circle, a ______________ force is necessary.

When you push on a stationary object and it doesn't move, what kind of force is most likely to be opposing your efforts?

The variable r that appears in the equation F = Gm₁m₂/r² is

The acceleration produced by an unbalanced force acting on an object is

The gravitational pull of Earth acting on an object is zero when the object

The acceleration of an object with a zero net force acting on it is ______________.

Two of your classmates, each 82 kg, are separated by 4 meters. The gravitational force of attraction between them in nano-newtons is

Forces always occur in ______________.

A student stands on a chair. The forces acting on her or him are supplied by gravity acting downward and by the ______________ acting upward.

For Newton's third law, the action and reaction forces are equal in magnitude and ______________ in direction.

The essentials of the first law of motion were initially developed by

What is the mass in kilograms of an astronaut on the Moon who weighs 185 lb on Earth?

It is generally easier to push an object once it is moving than when one is getting it started. Why is this?

Newton's third law force pair acts on ______________ objects.

An object will ______________ in a fluid if its average density is ______________ the density of the fluid.

It is generally easier to push an object once it is moving than when you are getting it started. This is because