Mastering Physics Ch. 2 & 3a

If no external forces are acting on a moving object, it will

continue moving at the same velocity

When a rocket ship accelerating in outer space runs out of fuel, it will

no longer accelerate; it will continue at the velocity which it had when its fuel ran out

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

zero

An object in mechanical equilibrium is an object

-at rest -moving with constant velocity -having no acceleration

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

10 N

After ten seconds, a car is moving at 40 m/s. What is the car's acceleration?

4.0 m/s^2

Galileo's use of inclined planes allowed him to effectively

decrease the acceleration of free fall

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight-line path