Describing Motion Acceleration Motion and Forces Newton’s Laws of Motion Gravity 1pt 1 pt 1 pt 1pt 1 pt 2 pt 2 pt 2pt 2pt 2 pt 3 pt 3 pt 3 pt 3 pt 3 pt 4 pt 4 pt 4pt 4 pt 4pt 5pt 5 pt 5 pt 5 pt 5 pt
The distance an object travels per unit time.
speed
What is it called when referring to the distance and direction of an object’s change in relation to its starting point?
Displacement
What type of speed is it when you look down at your speedometer?
Instantaneous
On which axis would you plot distance?
Y-axis
If Timmy won a 300-meter race in 40 seconds, his speed would be ______.
7.5 m/s
What is the difference between velocity and speed?
Velocity includes direction whereas speed does not.
How do you find the change in velocity?
Final Velocity – Initial Velocity
A car slamming on the brakes at a yellow light is an example of ______ _______.
Negative Acceleration
What is the formula for finding acceleration?
A = Vf – Vi t
A meteor’s speed is 10,000 m/s. After 1 minute, it is 5,000 m/s A meteor’s speed is 10,000 m/s. After 1 minute, it is 5,000 m/s. What is the meteor’s acceleration?
-83.3 m/s² (must convert minutes to seconds)
What is it called when two or more forces act on an object at the same time?
Net Force
The microscopic bumps caused by friction are called ______.
microwelds
Sledding down a hill is an example of what type of friction?
Sliding Friction
A friction-like force that opposed motion of objects moving through the air is called ________.
Air Resistance
Name the 4 types of friction.
Fluid Rolling Sliding Static
The Law of Inertia is another name for __________.
Newton’s 1st Law
When you paddle a canoe, the canoe goes forward is an example of _____.
Newton’s 3rd Law
The equation F= m x a represents what?
Newton’s 2nd Law
Acceleration is determined by the ____ of the force and the ____ of an object.
size mass
As an ice skater pushes harder with his leg muscle, he begins to move faster is an example of what?
Newton’s 2nd Law
What is the unit of measurement for the gravitational force exerted on an object?
Newtons
What type of path does a projectile follow?
Curved path
Name the two types of motion related to projectiles.
Horizontal Motion Vertical Motion
“Centripetal” means what?
Center
The _____ the object mass, the ______ the gravitational force.
Greater Stronger
A soccer player is running at 6 m/s A soccer player is running at 6 m/s. He then stumbles over an opponent’s foot falling and rolling to a stop. This took 4 seconds. What was his acceleration?
Vf = 0 Vi = 6 T = 4 0-6 m/s = -6 m/s 4s 4s -1.5 m/s²
A skateboarder fell doing a jump A skateboarder fell doing a jump. She got up and after 5 seconds, returned to a velocity of 5 m/s. What is her acceleration?
Vf = 5 Vi = 0 T = 5 5-0 m/s = 5 m/s 5s 5s 1 m/s²