Physics Force & Laws Of Motion Level: Misc Level
Acceleration is always in the direction;
a. of the displacement
b. of the initial velocity
c.of the final velocity
d. of the net force
e. opposite to the frictional force
Physics Force & Laws Of Motion Level: Misc Level
The standard 1- kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a
a. 2.8 N
b.5.6 N
c.11.2 N
d. 0
e. an undetermined amount
Physics Force & Laws Of Motion Level: Misc Level
An example of an inertial reference frame is;
a. any frame that is not accelerating
b. a frame attached to a particle on which no forces act
c. any frame that is at rest
d. a frame attached to the center of the universe
e. a frame attached to the Earth
Physics Force & Laws Of Motion Level: Misc Level
If you know the impuise that has acted on a body of mass m you can calculate
a. its initial velocity.
b.its final velocity.
c.its final momentum.
d.the change in its velocity.
e.its acceleration during the impulse.
Physics Force & Laws Of Motion Level: Misc Level
A car of mass m1 traveling at velocity v passes a car of mass m2 parked at the side of the road. The momentum of the system of two cars is
a.0.
b.m1 v.
c. (m1-m2)v.
d.m1v
m1 +m2
e. (m1+m2) v.
Physics Force & Laws Of Motion Level: Misc Level
A 4.0 -kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall.The partical rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to tthe particle?
a. 24 N-s
b.32 NN ss
c. 400 NN ss
d. 30N .s
e. 8.0 N.s
Physics Force & Laws Of Motion Level: Misc Level
A 1.2 kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction .If the object is in contact with the wall for 2.0 ms. what is the magnitude of the average force on the object by the wall?
a. 9.8 kN
b.8.4 kN
c. 7.7 kN
d. 9.1 kN
e.1.2 kN
Physics Force & Laws Of Motion Level: Misc Level
Consider a flat surface with a coefficient of friction of .20 with a 2.0 kg mass And a 3.0 kg mass connected together with a 6.0 kg mass along a slant as shown below. The coefficient of friction on the slant is zero. Calculate the acceleration of the system.
Physics Force & Laws Of Motion Level: Misc Level
The distance between two telephone poles is 50 m. When a 1.00Kg bird lands on the telephone wire midway between the poles, the wire sags 0.200 m. Draw a free body diagram of the bird. How much tension does the bird produce in the wire? (Ignore the weight of the wire)
Physics Force & Laws Of Motion Level: Misc Level
A 46.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact in the following cases? If the dancer is leaping upwards with an acceleration of 4.00 m/s2.---Pa
Physics Force & Laws Of Motion Level: Misc Level
If the shear stress in steel exceeds about 3.70 108 N/m2, the steel ruptures.Determine the shearing force necessary to punch a 1.00 cm diameter hole in a steel plate 0.450 cm thick.-----N
Physics Force & Laws Of Motion Level: Misc Level
Suppose that a girl weighing 125 pounds is wearing spike" heel shoes. If the surface of the heel in contact with the floor corresponds to a square measuring 1/4 on each side, and if she stands momentarily with all her weight on one heel, what is the pressure she exerts on the floor?
a.125 Ibs/in2
b. 500 Ibs/in2
c. 1000 Ibs/in2
d.1250 Ibs/in2
e. 2000 Ibs /in2
Physics Force & Laws Of Motion Level: Misc Level
When a force is applied to a certain rod, there is a 1 cm change in length. If that same force is applied to a rod that is three times bigger in each dimension, what will be the change in length?
a. 9 cm
b. 3 cm
c.1 cm
d.0.33 cm
e.0667 cm
Physics Force & Laws Of Motion Level: Misc Level
If you blow up a balloon, and then release it, theballoon will fly away as air rushes out. This is an illustration of-Galleo,s law of inertia, Newton,s 2 nd law, 1 or,st law or third law.
Physics Force & Laws Of Motion Level: Misc Level
The force that a squirrel exerts on a nut it has found is observed over a 10 second interval, as shown in the graph. What is the average power exerted by the squirrel?
