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Terms in this set (38)
speed or velocity- 14 m/s SSE
speed or velocity- 40 Km/h toward the town square V
speed or velocity- 80 Km/h
speed or velocity-28 Km from Los Angeles to Catalina Island
speed or velocity- 50 mi/h North
What does a negative slope on a velocity vs. time graph indicate?
It indicates that the acceleration is decreasing
Acceleration is defined as the change in velocity divided by what?
How do you find change in velocity?
Final velocity - initial velocity
What is the Si unit for acceleration?
The distance traveled divided by the time it takes to travel that distance is called?
Speed or velocity
What is the speed of an object at rest?
What is the difference between speed and velocity
Centripetal acceleration occurs because an object is?
The combination of all of the forces acting on an object is called the?
If the net force acting on a stationary object is zero, then the object will?
Stay at rest
A tug-of war that results in one team pulling the other across the line is an example of what?
An object is in motion when?
Move away from a reference point
Given an example displacement
6 blocks west
For an object moving at a constant speed, the distance-time graph looks like what?
Has a straight line
What is an example of balanced force?
What is friction?
Forces that opposes motion between two surfaces that are touching
If the slope of a line on a distance-time graph is 1, the speed of the object being plotted is
force is a quantity made up of ------
magnitude and direction
A plane is flying east 275 km/h. Another plane is flying west at 275 km/h. Are the two planes flying at the same velocity? Explain
NO because they have different direction but they have the same speed
A pitcher throws a softball to home plate, a distance of 43 ft. The ball reaches home late in 0.55s. Calculate the velocity of the ball in ft/s
78.18 ft/s towards home plate
During a race, a sprinter increases from 5 m/s to 8m/s over a period of 2s. What is the sprinter's average acceleration during this period?
A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What is the conclusion that can be drawn?
What kind of straight-line acceleration indicates an increase in speed?
When velocity of an object changes, it is acted upon by a(n) ------
A car parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?
A plane flying east in still air at 400 km/hr. Suddenly, the place is hit by a headwind blowing at 50 km/hr toward the west. What is the resultant velocity of the plane?
350 km/hr east
A power boat accelerates along a straight path from 0 tm/s to 0.4 m/s. In 8s. FInd the average acceleration of the boat in m/s.
List two situations in which friction is helpful or necessary
Rubbing your hands to get warm, and driving your car on the road, baseball glove
You are pushing a heavy crate across a cement floor when you hit a section of flooring covered with smooth steel plates.... Now it is easier to push - Why?
Why would a cyclist accelerate when turning a corner even if the speed does not change?
They are changing direction
How can the friction on a water slide be reduced?
Having a constant stream of water/ soap
Frictional forces are greatest when both surfaces are rough?
Friction between a car's windshield and the air as you drive into the wind is an example of kinetic friction?
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