Ch 3 Forces and Newton's Law Test

The amount of gravitational force between objects depends on their __________ ( mark all answers that apply)

• frictional forces

• accelerations

• mass

• distance apart

The upward force exerted on an object falling through air is ________.

• Momentum

• Terminal velocity

• weightlessness

• air resistance

An object in free fall seems to be _________

• not moving

• slowed down by air

• weightless

• falling constantly

If an object moves in a circle, its acceleration towards the center is the result of _____

• centrifugal force

• terminal velocity

• Friction

• Centripetal force

When a car traveling at 50 km/h collides head-on with an immovable object, it stops within about _______

• 100 seconds

• 10 seconds

• 1 second

• 0.1 second

Astronauts in the international space station are ______ because they in orbit around the earth.

• weightless

• at terminal velocity

• experiencing air resistance

• motionless

An object that has reached terminal velocity is accelerating at ____________

• 9.8 m/s^2

• 0 m/s^2

• one g

• 98 m/s^2

If a 500 N force is exerted to the left, the reaction force would be ____________________

• 500 N to the left

• 500 N to the right

• 0 N to the left

• 0 N to the right

An object that is being swung in a circle on a string will continue to move __________________ if the string breaks.

• in a circle

• in an opposite direction

• in a straight line

• toward the center of the circle

A car traveling around a curve is experiencing _________ force

• Centripetal

• Centrifugal

• Constant

• weightless