Question

vocabulary review
force - push or a pull that acts on an object
net force - the force that results from the combination of all forces that act on an object
speed - the rate at which an object moves. includes distance and time
velocity - the speed of an object in a particular direction
acceleration - the rate at which an object’s velocity changes
mass - the measure of the amount of matter in an object
weight - the force of gravity acting on an object
inertia - the tendency of a still or moving object to resist a change in its motion
motion - a change in a position or place
gravity - the force of attraction between objects that is due to their masses.
motion

1. describe the motion of the object based on the graphs below

a ______
b ______
c ______
d ______
e ______
f ______
use the graph to the left to answer the following questions.

1. what is each object doing? how do you know?

a.

b.

c.

d.

Explanation:

Step1: Analyze Graph A (Distance-Time)

Graph A shows distance increasing linearly with time. For a distance-time graph, a straight positive slope means constant speed (uniform motion, no acceleration).

Step2: Analyze Graph B (Distance-Time)

Graph B shows distance staying constant as time passes. A flat line on a distance-time graph means the object is not changing position, so it is stationary.

Step3: Analyze Graph C (Velocity-Time)

Graph C shows velocity increasing linearly with time. A positive straight slope on a velocity-time graph means constant acceleration (speeding up at a steady rate).

Step4: Analyze Graph D (Velocity-Time)

Graph D shows velocity staying constant as time passes. A flat line on a velocity-time graph means the object is moving at a constant speed (no acceleration).

Step5: Analyze Graph E (Speed-Time)

Graph E shows speed decreasing linearly to 0 over time. A negative straight slope on a speed-time graph means constant deceleration (slowing down steadily until stopping).

Step6: Analyze Graph F (Speed-Time)

Graph F shows speed increasing at an increasing rate (curved upward slope). A curved upward slope on a speed-time graph means increasing acceleration (speeding up faster and faster).

Step7: Analyze Lower Graph (Distance-Time: A,B,C,D)

• Object A: Flat distance-time line → stationary (no position change over time).
• Object B: Negative linear slope → constant speed, moving toward starting position.
• Object C: Positive linear slope → constant speed, moving away from starting position.
• Object D: Negative curved (steepening) slope → increasing speed, moving toward starting position (slope gets steeper, so speed increases).

Answer:

1. Motion Descriptions for Graphs A-F:

A. Moving at a constant speed (uniform motion)
B. Stationary (not moving)
C. Accelerating (speeding up at a constant rate)
D. Moving at a constant speed (uniform motion, no acceleration)
E. Decelerating (slowing down steadily until stopping)
F. Accelerating with increasing acceleration (speeding up faster over time)

2. Motion for Objects A-D (Lower Graph):

A. Stationary; its distance does not change as time passes (flat line on distance-time graph).
B. Moving toward the starting point at a constant speed; it has a straight, downward-sloping line on the distance-time graph.
C. Moving away from the starting point at a constant speed; it has a straight, upward-sloping line on the distance-time graph.
D. Moving toward the starting point with increasing speed; it has a downward-curving line (steepening slope) on the distance-time graph, meaning its speed is increasing as it moves back.