Section 1
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Displacement is equal to the area between a vt grah line and the time axis with a positive or negative sign
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Mar 1, 2020
Cards (59)
Section 1
(50 cards)
Displacement is equal to the area between a vt grah line and the time axis with a positive or negative sign
-finding he height times width of the velocity graph -definition of the slope of the pt graph -applying the equation for linear motion
what information about a moving object can we not extract from motion diagram?
what the object was doing before the first dot of the motion diagram
A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?
0.422 m/s^2
Given the graph of the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward motion?
whatever letter is touching the T axis of a v/t graph
A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box?
220 N
The graph above shows the velocity versus time for an object moving in a straight line. At what time after t = 0 does the object again pass through its initial position?
The speed increases, but acceleration decreases (box is positioned at dip in the curve)
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average force during the collision is correct?
The small car and the truck experience the same average force.
A player kicks a soccer ball in a high arc toward the opponent's goal. At the highest point in its trajectory
neither the ball's velocity nor its acceleration are zero.
A ball which is dropped from the top of a building strikes the ground with a speed of 30 m/s. Assume air resistance can be ignored. The height of the building is approximately:
45 m
to allow the force of the expanding gases from the gunpowder to act for a longer time
10 kg*m/s
Starting from rest, object 1 falls freely for 4.0 seconds, and object 2 falls freely for 8.0 seconds. Compared to object 1, object 2 falls:
four times as far
T/F In order to get an object moving you must push harder on it than it pushes back on you
False
Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.)
The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
T/F The magnitude of a vector can never be less than the magnitude of any of its components
TRUE
A crate is sliding down an inclined ramp at a constant speed 0.55 m/s. the vector sum of all the forces acting on this crate must point... -down the ramp -up the ramp -vertically down -none of the above
none of the above
on an xt graph where does v=0?
curve
If the vt graph of an object is a horizontal line, the object is
moving with constant velocity
If you are driving 72 km/h along a straight road adn look to the side for 4.0s, how far do you travel during this period?
(7200/3600)*2=8 80m
wo boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord. The mass of P is greater than that of Q. A horizontal force f is applied to box Q as shown in the figure, accelerating the bodies to the right. The magnitude of the force exerted by the connecting cord on body P is
less than F but not zero
if the position versus time graph of an object is a horizontal line....
the object is at rest
Graph an object at rest
xt graph, horizontal line
A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal. What must be true about normal force F on the block due to the ramp?
F=mgcos(theta)
A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
160 N
units of velocit are...
m/s
For general projectile motion with no air resistance, the horizontal component of a projectile's velocity
remains a non zero constant
A horizontal 52-N force is needed to slide a 50 kg box across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?
0.11
what are the SI units of (1/2)axt^2
m..... (m/s^2)(s^2)
Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as shown in the figure. Which of the following statements about the tensions is correct?
T1>T2
T/F If a vector's components are all negative then the magnitude of the vector is negative
False
pt graph: increases until 3 seconds, horizontal line until 6...what is the velocity at t=4
0 m/s
The graph above shows the velocity versus time for an object moving in a straight line. At what time after t = 0 does the object again pass through its initial position?
(VT graph that's accelerating in the negative for .5 a second then deccelerating for another .5, then increasing until 2 seconds then remaining constant)
An object slides on a level floor. It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2. What is the coefficient of kinetic friction between the object and the floor?
0.24
A satellite is in orbit around the earth. Which one feels the greater force...
neither, they feel the same force
write an equation for: t=0, an object is 10m above ground, moving upwards with a velocity of 1 m/s, y=0 at the ground and +y is downward
y=(-10m)+(-1m/s)+(1/2)(9.8m/s^2)(t^2)
During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
to allow the force of the expanding gases from the gunpowder to act for a longer time
A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle θ below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal t
W+Psin(theta)
A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the hill exerts on the sled parallel to the surface of the hill?
0 N
x=(2m)+0t+(1/2)(-1m/s^2)t^2 which of the following is true: -object has constant velocity -the object starts with an initial velocity -object is speeding up -object starts to the left of the origin
object is speeding up
vt graph// Truck: constant velocity, car: Increasing velocity....at "T" when they cross paths:
the truck will have traveled farther than the car
Path length and displacement of an object that travels north 15, south 11
26.0 m, 4.0m
Suppose that an object traveled from one point in space to another. Make a comparison b/w the magnitude of displacement and the path length
The displacement is either less than or equal to the path length traveled
the area under a curve in vt graph gives...
displacement
If a vector A has components Ax < 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the rang
180-270 degrees
Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions must be true about the tension T in the wire?
Tsin(theta)=W
what must be your average speed in order to travel 350 km in 5.15 hours?
68 km/h
x2=-4t+0 what is false: -starts at the origin -has a velocity of 4 m/s -is moving in -x direction
has a velocity of 4 m/s....would be negative 4
If a vector has components Ax<0, and Ay>0, then the angle that this vector makes with the positive x-axis must be in the range...
90-180 degrees
A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If we can neglect air resistance, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
cos60=x/20 20cos60=10m/s
the slope of a PT graph gives...
VELOCITY
Distance is always the ____ of _____
length/displacement
Section 2
(9 cards)