Physics 101 Question Set 2

A car traveling at 24 m/s comes to a halt in 6 seconds. What is the acceleration in m/s/s of the car?

-4

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 5t + 4. What was the initial position of this object?

4 m

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 4t + 5. What was the initial velocity of this object?

4 m/s

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in m/s/s?

4 m/s/s

The faster an object travels, the ____________________ its "Distance vs Time" graph will be.

steeper

An object that remains stationary at the -5 m position can be modeled mathematically by which equation?

x(t) = -5

An object that starts at the origin and moves with a constant velocity of -5 m/s can be modeled mathematically by which equation?

x(t) = -5t

An object that starts at the origin and moves with a constant velocity of 5 m/s can be modeled mathematically by which equation?

x(t) = 5t

An object that starts at the 5 m position and moves with a constant velocity of 1 m/s can be modeled mathematically by which equation?

x(t) = t + 5

What is the average acceleration of an object whose velocity changes from 10 m/s to 18 m/s in 4.0 s?

2 m/s/s

An object travels 5 m east in 6 s, stops for 3 s, and then travels 15 m west in 11 s. Its displacement was

10 m west

A car accelerates at 2 m/s/s. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?

15 seconds

An object's position (in meters) as a function of time (in seconds) is modeled by the equation x(t) = 5t2 + 4t + 2. What was the initial position of this object?

2 m

An object that is moving to the right with a constant speed can be modeled pictorially by a series of dots that

are evenly spaced

Objects that are speeding up in the negative direction have Distance vs Time graphs that

curve downward and get steeper

Objects that are slowing down in the positive direction have Distance vs Time graphs that

curve upward and get flatter

An object that is slowing down while moving to the right can be modeled pictorially by a series of dots that

get closer together with time