Motion Graphs
A speed–time graph slopes downward from left to right. What does this tell you about the object’s motion?
WHAT IS:
The object is slowing down
OR
(negative acceleration).
What is the main difference between speed and velocity?
WHAT IS:
Velocity includes direction; speed does not.
Two equal forces pull an object in opposite directions. What is the net force?
WHAT IS:
Zero newtons
Which Newton’s Law explains why a moving object keeps moving unless acted on by a force?
WHAT IS:
Newton’s First Law.
An object’s resistance to changes in motion.
WHAT IS:
Inertia
On a distance–time graph, what does a straight diagonal line represent?
WHAT IS:
CONSTANT speed.
A skateboard speeds up while moving west. What is happening ?
WHAT IS:
It is accelerating
A box is pushed right with 12 N and friction pushes left with 7 N. What is the net force?
WHAT IS:
5 N to the right
When you push on a wall and feel it push back, which law is this?
WHAT IS:
Newton’s Third Law.
Two objects are pushed with the same force. Which one accelerates more: the lighter or heavier one?
WHAT IS:
The lighter object.
An object’s speed increases more each second. How would this look on a speed–time graph?
WHAT IS:
A line that curves upward
What causes acceleration to change: distance, mass, or net force?
WHAT IS:
Net force
What happens to an object when forces are unbalanced?
WHAT IS:
Its motion/ position changes (speed or direction).
A heavier object needs more force to move. Which law explains this?
WHAT IS:
Newton’s Second Law.
Why are storm shelter doors made heavier than regular doors?
WHAT IS:
More mass means more force is needed to move them.
Two cars move east. One has a flat line on a velocity–time graph. What does that say about its motion?
WHAT IS:
The car has constant velocity.
Can an object be accelerating if it is slowing down? Why?
WHAT IS :
Yes, change in speed
In tug-of-war, one team pulls harder. Which way does the rope move?
WHAT IS:
Toward the side with the greater force.
Why do cars use parachutes to slow down after a race?
WHAT IS:
To creates an unbalanced force that reduces speed.
If mass increases and force stays the same, what happens to acceleration?
WHAT IS:
it decreases
A distance–time graph becomes steeper over time. What does this tell you about the object’s speed?
WHAT IS:
It's increasing
A car moves north at 10 m/s, then turns east at 10 m/s. Did its acceleration change? How?
WHAT IS:
Yes, direction changed
A box is pushed right with 15 N and left with 15 N. What happens to the motion of the box?
WHAT IS:
It does not change motion (balanced forces).
A soccer ball and a bowling ball are kicked with the same force. Which accelerates more and why?
WHAT IS:
The soccer ball, because it has less mass.
Why is it harder to start a full shopping cart moving than an empty one?
WHAT IS:
The full cart has more mass and more inertia.