Inertia; First Law of Motion

Suppose that an astronaut Sultan Al Neyadi throws a football in outer space at a location far from significant influences of gravity and air resistance. One would expect that the football would ____.

• eventually stop since all objects ultimately "lose their steam"

• eventually stop as its inertia slowly becomes used up

• continue in motion with the same speed and direction

• either a, b, or c -- depending on whether the astronaut continues to push it

Inertia is a force that keeps stationary objects at rest and moving objects in motion at a constant velocity.

• True

• False

When all individual forces acting on an object are balanced, it is the natural tendency of an object to _____. List all that apply in alphabetical order with no spaces between letters.

• maintain its state of motion

• eventually stop

• accelerate

• either speed up, slow down or keep the same speed

• keep its velocity constant (either at a zero or non-zero value)

Inertia refers to _____

• the tendency of moving objects to remain in motion

• the force which keeps moving objects in motion with a constant velocity

• the force that keeps stationary objects at rest

• the tendency of stationary objects to remain at rest

A bike rolls down a desert dune in Liwa, reaches the level surface and eventually comes to a stop. The fact that the bike ultimately stops is best explained by ____.

• an unbalanced force would be required to keep the sled moving forward at constant speed

• the presence of an unbalanced force (e.g., friction) can cause a moving object to stop

• the presence of inertia causes it to stop

• the natural tendency of any object is to ultimately stop

List the objects in order from least to greatest inertia.

• CDBA

• ABCD

• BCDA

• CBAD

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a(n) ____________________.

• unbalanced force

• inertia

• mass

• balanced force

More mass = More inertia

• True

• False

Majid guides a golf ball around the outside rim of the green at the Hole-In-One Putt-Putt Golf Course. When the ball leaves the rim, which path (A, B, or C) will the golf ball follow?

• A

• B

• C

Objects with smaller _________ also have smaller inertia.

• speed
• mass
• temperature
• friction