Section 1
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Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 Newtons at an angle of 37.0º upward from the horizontal. If he pulls her a distance of 12.0 m, the work he does is
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Cards (52)
Section 1
(50 cards)
Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 Newtons at an angle of 37.0º upward from the horizontal. If he pulls her a distance of 12.0 m, the work he does is
575 J
Work done by STATIC FRICTION is always
zero
An object is under the influence of a force as represented by the force vs. position graph in Fig. 5-7. What is the work done as the object moves from 6 m to 12 m?
30 J
If the acceleration vector of an object is a directed parallel to the velocity vector, then
the object is speeding up.
A container of water is lifted vertically 3.0m, then returned to its original position. If the total weight is 30 N, how much work has it done?
No work was done (d=0, so W=Fd, W=0)
On a plot of F vs. x, what represents the work done by the force F?
The area under the curve
To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep is moving. This is because
the static coefficient of friction is larger than the kinetic coefficient
A leaf falls from a tree. Compare its kinetic energy K to its potential energy U.
K increases, and U decreases
If both the mass and the velocity of a ball are tripled, the kinetic energy is increased by a factor of
27
When a ball is thrown straight upon, which of the following is zero at its highest point?
velocity
All of the following are vectors, except: A. Displacement B. Velocity C. Acceleration D. Force E. Mass
mass
The force that a squirrel exerts on a nut it has found is observed over a 10 second interval, as shown in Fig. 5-10. What was the average power exerted by the squirrel?
2.5 W
A 42.0 kg block of ice slides down the plane incline 34.0º in fig. 4-14. Assuming friction is negligible, what is the acceleration of the block down the incline?
5.48 m/s^2
Compared to yesterday, you did 3 times the work in one-third the time. To do so, your power output must have been
9 times yesterday's power output.
If the acceleration vector of an object is directed anti-parallel to the velocity vector, then
the object is slowing down
Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0s. What is the net force acting on the body?
16N
Galileo's Law of Inertia is the same as
Newton's First law
In Fig. 5-2, showing a pendulum, at what position is the kinetic energy maximum?
A (the center at the bottom)
A force of 120 N is applied to an object whose mass is 30 kg. The object's acceleration is
4.0 m/s^2
For a projectile launched horizontally, the vertical component of a projectile's velocity
continuously increases
When is the average velocity of an object equal to the instantaneous velocity?
Only when the velocity is constant
A spring is characterized by a spring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?
.003 J
A car is able to stop in a distance d. Assuming the same braking force, what distance does the car require to stop when it is traveling twice as fast?
4D (Four times as much)
A 200-g mass attached to the end of a spring causes it to stretch 5.0 cm. If another 200-g mass is added to the spring, the potential energy of the spring will be
four times as much.
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
45º
Refer to Fig. 5-8. How much work was required to bring the 1000-kg roller coaster from point P (h=0) to rest at point Q (h=50m) at the top of the 50 m peak?
.49 MJ
For a projectile launched horizontally, the horizontal component of a projectile's velocity
remains a non-zero constant
Bullet G is dropped, from rest, at the same time that another bullet H is fired horizontally from a rifle. If both bullets leave from the same height above the ground, then
both bullets hit the ground at the same time.
Two cars collide head-on. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of
Newton's third law
Consider a thrown ball which has reached its highest point in flight. The magnitude of the acceleration
is g
Refer to Fig. 5-4. What is the amount of work done by the force F3 as the object moves up the inclined plane?
0 (It's at 90º, so if W=Fdcosθ and cos 90º=0, then w=0)
You are serving the volleyball for the second time in a volleyball game. If the ball leaves your hand with twice the velocity it had on your first serve, its horizontal range R (compared to your first serve) would be
four times as much
A 10 kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is
49 N/cm
The force that a squirrel exerts on a nut it has found is observed over a 10. second interval, as shown in Fig. 5-5. How much did the squirrel do during that 10s?
25 J
All of the following are scalars, except: A. Mass B. Distance C. Time D. Force E. Temperature
Force
A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. How large is the coefficient of kinetic friction, μk, if the plane makes an angle of 25º with the horizontal.
.47
Which graph in Fig. 2-1 represents an object at rest?
Graph A (straight, horizontal line)
For constant linear acceleration, the velocity versus time graph is a
sloped line
Batter up! Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is
exactly equal to 1500 N
Speed is to velocity as distance is to
displacement
A block of mass M slides down a frictionless plane inclined at an angle θ with the horizontal. The normal reaction force exerted by the plane on the block is
Mg cos θ
When an object is released from rest and falls in the absence of friction, which of the following true concerning its motion?
Its acceleration is constant
In Fig. 5-2, showing a pendulum, at what position is the potential energy maximum?
C (Very right at the top)
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0º above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s^2, what is the coefficient of friction between the sled and the ground?
.161
The area under the curve, on a Force-position (F-x) graph, represents
work
Two toy cars (16 kg and 2 kg) are released simultaneously on an inclined plane that makes an angle of 30º with the horizontal. Which statement best describes their acceleration after being released?
Both cars accelerate at a rate of g sin(30º)
An arrow is shot, from a bow, at an original speed of Vo. When it returns to the same horizontal level, its speed will be
Vo
The slope of a line connecting two points on a position versus time graph gives
average velocity
A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below?
the stone
A car travels east with a constant velocity. The magnitude of the acceleration of the car is?
Zero.
Section 2
(2 cards)