Describing Motion
when distance of an object changes in relation to another object
Motion
DAILY DOUBLE
What is the formula for calculating speed
speed = distance / time
A push or pull on an object due to its interaction with another object.
A straight line on a motion graph represents what?
Constant speed.
Send someone to the board to draw the speed triangle.
(teacher will judge)
a place or object used for comparison to determine if something is in motion
Reference Point
After being pushed with 20N of force, which item will accelerate more?
Item #1 has 10kg mass
Item #2 has 100kg mass
The type of force that results in a change in motion.
Unbalanced force
A line curving up on a motion graph represents what?
Acceleration (speeding up)
A bird flies 40 km in 2 hours. What is its speed?
S = distance / time
S = 40km / 2 hr
S = 20 km/hr
DAILY DOUBLE
Define inertia. Which Newton's Law is also known as the Law of Inertia?
Inertia is an object's resistance to a change in movement.
Newton's 1st Law (an object at rest stays at rest and an object in motion stays in motion unless acted on by an unbalanced force)
4,000 m = ______ km
4 km
Do you add or subtract forces that are acting in the same direction?
Add
A steeper slope represents _____ speed.
Faster
How will friction affect average speed?
It will cause speed to decrease (deceleration)
What are the metric units for distance?
Kilometer, meter, centimeter
Name 1 distance unit, 1 time unit & 1 speed unit
Correct answers include:
km, hour, km/hr
m, sec, m/s
If a car's engine is applying 100N of force to the right and the wind is applying 75N of force to the left, what is the net force and direction of movement of the car?
Net Force = 100N - 75N = 25N to the right
On a distance graph, how do you show a stationary object?
With a horizontal line
DAILY DOUBLE
How do you calculate average speed over a journey?
Average speed = total distance / total time
1st Law: Law of Inertia
2nd Law: F=mxa
3rd Law: Action-Reaction Pairs
Name a reference point in this room that you could use to describe your motion.
Whiteboards, Cabinets, Windows, Door
What happens to an object when the forces acting on it are balanced?
The object does not change its motion or direction.
Draw a graph that shows a person walking to a bus stop, waiting for a few minutes, then running back home to get their lunchbox.
(teacher will judge the graph)
Calculate the average speed:
0 m ; 0 sec
10 m ; 10 sec
50 m ; 50 sec
150 m ; 150 sec
Average speed = total distance / total time
Avg speed = 150 m / 150 sec
Avg speed = 1 m/sec