Physics Force & Laws Of Motion Level: High School
(a) In a football match a 116 kg fullback is running at 3.98 m/s to the east and is stopped in 0.700 s by a head-on tackle by a tackler running due west . Calculate the original momentum of the fullback.(b) Calculate the average force exerted on the tackler .
Physics Force & Laws Of Motion Level: High School
(a) A car is stopped for a traffic signal . When the light turns green , the car accelerates , increasing its speed from 0 to 5.45 m/s in 0.710 s . What is the magnitude of the linear impulse experienced by a 66.3 kg passenger in the car during this time ?(b) What is the average force experienced by the passenger ?
Physics Work,Power & Energy Level: High School
would it take him to lift a 200 kg load . if the winch has an efficiency of 90 percent , and the rate at which can do work is 0.8 hp ?63 s
A roofer lifts supplies to a height of 20 m with a hand-operated winch . How long 73 s
Physics Work,Power & Energy Level: High School
A 200 gram mass is 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 beTwice as much .
The same.
4 times as much
.3 times as much.
Physics Work,Power & Energy Level: High School
Assuming negligible friction , what spring constant would be needed by the spring in a “B-B gun” to fire a 10 gram pellet to a height of 100 meters if the spring is initially compressed 10 cm ?2.0 N/cm
200 N/m
20 N/m
Physics Force & Laws Of Motion Level: High School
What distinguishes a conservative force from a non-conservative force ?Work done by a conservative force is depend of the objects path and the work only depends upon the initial and final positions.
Work done by a conservative force is independent of the objects path and the work only depends upon the initial and final positions.
Physics Work,Power & Energy Level: High School
The total mechanic energy of a systemIs equally divided between kinetic energy and potential energy.
Is constant, only if conservative forces act.
Is either all kinetic energy or all potential energy, at any one instant.
Can never be negative.
Physics Force & Laws Of Motion Level: High School
Consider an ideal elastic spring . The spring constant is :Not depend upon mass, displacement , or applied force.
Proportional to the applied force .
Inversely proportional to the applied force.
Proportional to the mass attached to the spring.
Proportional to the displacement from equilibrium.
Physics Force & Laws Of Motion Level: High School
For identical materials , static coefficient of friction cannot be greater than kinetic coefficient of friction .True
False
Physics Kinematics Level: High School
A 4-kg mass and a 10-kg mass are acted on by the same constant net force during the same amount of time . Both masses are at rest before the force is applied . The 10-kg mass moves a distance X1 and the 4-kg mass moves a distance X2 as a result . Which of the following statement are true ?X1 is equal to X2
The ratio X1 /X2 is equal to 5/2
The ratio X1/X2 is equal to (2/5) 2
The ratio X1/X2 is equal to 2/5
Physics Kinematics Level: High School
If you exert a force F on an object , the force which the object exerts on you will Depend on whether or not you are moving.Be –F in all cases.
Depend on whether or not the object is moving.
Depend on the relative masses of you and the object.
Physics Kinematics Level: High School
If a force accelerates 4.5 kg at 40 m/s^2 , that same force would accelerate 18 kg by how much ?10 m/s^2
0.16 km/s^2
40 m/s^2
32 ft/s^2
0.18 km/s^2
Physics Kinematics Level: High School
A team of dogs pulls on a sled that has a mass of 150 kg with a net horizontal force of 300 N . Assuming that there is no friction , What is the acceleration of the sled ?2.00 m/s^2
0.500 kg-m
0.500 m/s^2
2.00 N-m
Physics Kinematics Level: High School
A load of steel of mass 6000 kg rests on the flatbed of a tuck . It is held in place by metal brackets and can exert a maximum horizontal force of 8000 N. When the truck is traveling 20 m/s . What is the minimum stopping distance if the load is not to slide forward into the cab ?156 m
150 m
Physics Force & Laws Of Motion Level: High School
A wooden block slides directly down an inclined plane, at a constant velocity of 6 m/s . How large is the coefficient of kinetic friction (A micro k) , if the plane makes an angle of 25 degree with the horizontal ?0.91
2.1
0.42
0.37
0.47
