Physics Force & Laws Of Motion Level: High School
A 50 kilogram student stands in an elevator . How much force does she exert on the elevator floor if it is moving upward at 1 meter per second squared ?
Physics Force & Laws Of Motion Level: High School
A 292 kg motorcycle is accelerating up along a ramp that is inclined 31.5 degree above the horizontal . The propulsion force pushing the motorcycle up the ramp is 2740 N, and air resistance produces a force of 250 N that opposes the motion . Find the magnitude of the motorcycle’s acceleration
Physics Force & Laws Of Motion Level: High School
In the drawing at ‘click here’ , the weight of the box on the table is 396 N and that of the hanging block is 170 N. Ignore all frictional effects , and assume the pulley to be massless .a) Find the acceleration of the two blocks .
b) Find the tension in the cord.
Physics Force & Laws Of Motion Level: High School
The speed of a bobsled is increasing because it has an acceleration of 2.8 m/s^2. At a given instant in time. The force resisting the motion, including kinetic friction and air resistance , total 450 N . The mass of the bobsled and its riders is 220 kg .a) What is the magnitude of the force propelling the bobsled forward ?
b) What is the magnitude of the force acts on the bobsled ?
Physics Force & Laws Of Motion Level: High School
The helicopter in the figure at “click here” is moving horizontally to the height at a constant velocity, The weight of the helicopter is W = 50400 N . The lift force L generated by the rotating blade makes an angle of 21 degree with respect to the vertical .a) What is the magnitude of the lift force ?
b) Determine the magnitude of the air resistance R that oppose the motion.
Physics Force & Laws Of Motion Level: High School
A 4.10 kg box is sliding across the horizontal floor of an elevator . The coefficient of kinetic friction between the box and the floor is 0.470 . Determine the kinetic frictional force that acts on the box for each of the following cases .a) The elevator is stationary.
b) The elevator is accelerating upward with an acceleration whose magnitude is 1.30 m/s^2.
c) The elevator is accelerating downward with an acceleration whose magnitude is 1.30 m/s^2.
Physics Force & Laws Of Motion Level: High School
A 28 kg crate rests on a horizontal floor, and a 63 kg person is standing on the crate .a) Determine the magnitude of the normal force that the floor exerts on the crate .
b) Determine the magnitude of the normal force that the crate exerts on the person .
Physics Force & Laws Of Motion Level: High School
A system has m1 = 6 kg, I1 = 0.1 kg. m^2, r1 = 0.2 m, I2 = 0. 125 kg. m^2, and r2 = 0.25 m. The acceleration of m1 is 2m/s^2 downward .a) Draw a free body diagram for mass m1 and use it to find the tension T1.
b) Find the angular acceleration a1 and a2 of the pulleys p1 and p2 .
c) Draw a free body diagram for pulley P1 and use it to find T3.
d) Draw a free body diagram for pulley P2 and use it to find T2 .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
Two ice skaters face each other with their hands pressed together . The mass of one of the skaters is 80 kg . When they push apart , the heavier skater moves backward at a velocity of 1.5 m/s , whereas the other skater’s velocity is 2.3 m/s . What is the mass of the other skater in kilograms ?
Physics Force & Laws Of Motion Level: High School
If a force accelerates 4.5 kg at 40 m/s^2 , that same force would accelerates 18 kg by how much ?
Physics Force & Laws Of Motion Level: High School
For identical materials , static coefficient of friction be greater than kinetic coefficient of friction .True
False
Physics Force & Laws Of Motion Level: High School
If you exert a force F on an object , the force which the object exerts on you willa. Depend on whether or not you are moving .
b. Depend on the relative masses of you and the object.
c. Depend on whether or not the object is moving.
d. Be –F in all cases.
Physics Force & Laws Of Motion 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 statements are true .a. The ratio X1/X2 is equal to 2/5
b. X1 is equal to X2
c. The ratio X1/X2 is equal to 5/2
d. The X1/X2 is equal to (2/5)^2
Physics Force & Laws Of Motion Level: High School
A load of steel of mass 6000 kg rests on the flatbed of a truck , It is held in place by metal brackets that 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 ?
Physics Force & Laws Of Motion 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 ?