Chapter 2: Inertia Flashcards
The first person to introduce the concept of inertia was
Galileo
The amount of force required to maintain the motion of a rocket in deep space is
Zero
When designing a car, what feature are included to slow the driver’s inertia if the car is involved in an accident?
1) Antilock brakes
2) Seatbelts
3) Airbags
Which of the following is a vector quantity?
Velocity
The minimum number of forces that act on a book resting on a table
2
A parallelogram is a four-sided figure with opposite sides that are
1) Equal in length
2) Parallel
While you are standing in the aisle of a bus, the driver suddenly make a right turn. You lurch to the left due to
Your inertia, which keeps you trying to more forward
When a rocket that is gaining speed in deep space runs out of fuel it?
No longer gains speed but maintain its speed because of its inertia
A traffic light hangs from the middle of a horizontal cable. Tension in the cable is greatest if the cable
Sags a lot
Inertia is
The tendency of an object to resist changes in its motion
A force is a vector quantity because it has:
Magnitude and direction
Galileo’s concluded that if you roll a ball along a level surface, it will
Keep rolling if there is no friction
If no forces act on a moving object, its path is:
A straight line
If a painter is on a horizontal scaffold that is supported by four vertical ropes, the tension in the ropes is
Add to equal the weight of the painter plus the weight of the scaffold
The force that cause Earth to orbit the Sun is due to gravity, while the force needed to keep Earth moving as its circles the sun is
No force at all
An object in mechanical equilibrium is an object
1) Moving with constant velocity
2) At rest
3) Having no changes in velocity
Tension is a forces that tends to
Stretches something
The resultant of a 30 N force at right angle to a 40 N force is
50 N
A seagull is on top of the mast of a sailboat moving at a constant velocity on a lake. The bird drops a clam it had in its beak. The clam hits the deck of the ship
At a point directly below the seagull
A traffic light hangs from a pair of cables at an angle. Tension in the cables depends on the
Angle of the cables
A crate pushed to the left with a force of 15 N and to the right with 5N at the same time experiences a net force of
10 N to the left
Two groups of student are in tug of war. Each pulls a rope in opposite directions with a force of 2000 N. The net force on the rope is
Zero, and rope tension is 2000 N
