Physics Force & Laws Of Motion Level: High School
Newton’s First Law of Motion
A boat has a mass of 6800 kg . Its engines generate a drive force of 3850 N , due west , while the wind exert a force of 730 N , due east , and the water exerts a resistive force of 1200 N due east . what is the magnitude and direction of the boat’s acceleration ?
Physics Force & Laws Of Motion Level: High School
A chain hangs from the ceiling of an elevator with three links as shown .(a). Rind A and C each have about twice the mass of ring B. If the elevator is at rest , draw a force diagram for rings A,B and C in your drawing , circle those forces , which are Newton’s 3rd Law pairs .
(b) Now say the elevator accelerates upward . Would your diagram for B be any different ? If no, explain why not , if yes , explain how it would change ?
(c) If the mass of A is 10 kg and the elevator accelerates upward with a = 2.0 m/sec 2 , Calculate the force of that ring A exerts on B .
Physics Force & Laws Of Motion Level: High School
On takeoff , the combined action of the engines and wings of an airplane exerts an 8000-N force on the plane , directed upward at an angle of 65 degrees above the horizontal . The plane rises with constant velocity in the vertical direction while continuing to accelerate in the horizontal direction . What is the weight of the plane ? What is the horizontal acceleration ?
Physics Force & Laws Of Motion Level: High School
(a) A 76.6 kg man steps out a window and falls (from rest) 1.01m to a sidewalk . What is his speed just before his feet strike the pavement ?
(b) If the man falls with his knees and ankles locked , the only cushion for his fall is a 0.490 cm give in the pads of his feet . Calculate the average force exerted on him by the ground in this situation . This average force is sufficient to cause cartilage damage in the joints or break bones .
Physics Force & Laws Of Motion Level: High School
Two identical masses are attached by a light string that passes over a small pulley . One of the masses rests on a flat table top while the other hangs over the edge (assume this mass does not touch the ground . ) The table and the pulley are frictionless . The masses are moving . Find the acceleration of the masses .
Physics Force & Laws Of Motion Level: High School
Two dams form artificial lakes of equal depth . However , on lake backs up 15 km behind the dam , and the other backs up 30 km behind , What effect does the difference in length have on the pressure on the dams ?Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A golf ball traveling 3 m/s to the right has a head-on collision with a stationary bowling ball in a friction-free environment . If the collision is almost perfectly elastic , What is the speed of the golf ball immediately after the collision ?
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s . Assume the two players were initially running directly at one another . Neglecting the effects due to digging in of cleats .Find their combined velocity .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 2.0 kg mass sliding on a frictionless surface explode into two 1.0 kg masses . After the explosion the velocities of the masses are (1) 3.0 m/s, north and (2) 5.0 m/s, 30 degree north of east . What was the magnitude of the original velocity of the 2.0 kilogram mass ?a. 3.1 m/s
b. 3.9 m/s
c. 3.5 m/s
d. 2.8 m/s
e. 2.4 m/s
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 5.0 g particle moving 60 m/s collides with a 2.0 g particle initially at rest . After the collision each of the particles has a velocity that is directed 30 degree from the original direction of motion of the 5.0 g particle . What is the speed of the 2.0 g particle after the collision ?a. 72 m/s
b. 79 m/s
c. 79 m/s
d. 94 m/s
e. 67 m/s
Physics Force & Laws Of Motion Level: High School
A car with mass m = 1200 kg is initially traveling directly east with a speed vi = 25.0 m/s . It crashes into the rear end of a truck with mass M = 9000 kg moving in the same direction with speed 20.0 m/s . Immediately after the collision, the car has a speed vf = 18.0 m/s in its original direction . What is the velocity of the truck immediately after the collision ?1. 15.0 m/s
2. 10.0 m/s
3. 5.0 m/s
4. 20.9 m/s
5. 18.0 m/s
Physics Force & Laws Of Motion Level: High School
The speed of a 2.0 kilogram object changes from 30 m/s to 40 m/s during a 5.0 second time interval . During this same time interval , the velocity of the object changes its direction by 90 degree . What is the Magnitude of the average total force acting on the object during this time interval ?30 Newtons
20 Newtons
40 Newtons
50 Newtons
4 Newtons
Physics Force & Laws Of Motion Level: High School
A engine delivers 30.0 hp (2.24 x 10 ^4 W) to its wheels while moving at 27.0 m/s (about 60 km/hr) . What is the resistive force acting on the auto at that speed ?
Physics Force & Laws Of Motion Level: High School
Hank (mass = 45 Kg ) dove 12 m (40 ft) into 0.32 (12.5 in) of water(a) What was his kinetic energy when he hit the water ?
(b) What was his speed when he hit the water ?(c) What average net force was exerted on him as he stopped ?
Physics Force & Laws Of Motion Level: High School
A softball having a mass of 0.240 kg is pitched at 92.0 km/hr . By the time it reaches the plate , it may have slowed by 12.2 percent . Neglecting gravity , estimate the average force of air resistance during a pitch , if the distance between the plate and the pitcher is 15.3 m .