Physics Force & Laws Of Motion Level: High School
A 200 g object is moving in a circle of radius 4 m with a uniform speed of 6 m/s . The net force acting on the object is ?3.6 N towards the centre of the circle
1.8 N away from the centre of the circle
1.8 N towards the centre of the circle
1.8 N tangential to the circle
Physics Force & Laws Of Motion Level: High School
Pulley and Mass
In an Atwood’s machine experiment , the larger mass is 1.8 kg and the smaller mass is 1.2 kg . Ignoring friction . the acceleration of the masses , when released from rest is ?0.8 g m/s2
0.2 g m/s2
0.6 g m/s2
1.2 g m/s2
Physics Force & Laws Of Motion Level: High School
Newton’s First Law
Newton’s first law is also known as the law of --------Inertia
Force
Acceleration
Velocity
Inertia
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
An elevator is moving downward with an acceleration of 2.0 m/s^2 . What is the force exerted on the elevator floor by a 75 kg person . (Assume g = 10 m/s2)900 N
750 N
150 N
600 N
Physics Force & Laws Of Motion Level: High School
Conservation of Momentum
Greg Maddux (Las Vegas resident and pitcher for the Chicago Cube) has gone for a canoe ride on Lake Mead , taking along a baseball . Out on the water , when his canoe is motionless , Maddux stands up and throws a fastball over the stern (rear end) of the canoe . How fast will the canoe with Maddux stands up and throws a fastball over the stern (rear end) of the canoe . How fast will the canoe with Maddux in it be moving after he throws the fastball ? Take Maddux’s mass to be 90.0 kg , the canoe’s mass to be 50.0 kg , and the baseball’s mass to be 0.25 kg . Assume Maddux throws a 40.0 m/s fastball .
Physics Force & Laws Of Motion Level: High School
Friction
A small box of mass m is stacked on top of a large box of mass 3 m . The surface between the large box and the horizontal surface on which it slides its smooth (frictionless) and the surface between the two boxes is rough ( there is friction) . The small box does not slide when a horizontal force is applied to the large box . Which statement about the boxes are true ?a) The net force on box 3 m is ½ F
b) The velocity of both boxes will increase
c) The acceleration of box 3m is (¼) F/m
d) If the force stops acting , the boxes will stop instantly .
e) The fore that causes the acceleration of box m is tension
Physics Force & Laws Of Motion Level: High School
Newton’s Third Law
Here on earth can you suggest a simple demonstration to show how the mass of fuel on board a spaceship can move the craft forward as the fuel burns out the back of the craft ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
Consider that the application of a force results in a mass being accelerated , and , that Sir Isaac was far ahead of his time to suggest the way that communication satellites could orbit the Earth , comment succinctly on the result of the force need to loft a payload into Earth orbit , that is , what must that force be sufficient to do to keep the mass of the satellite in orbit ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A nifty grown-up sports car of 2000 pounds zips 500 yards down a straightway in just one second , With how much force did the car accelerate in the inner child of its owner ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A wind-up toy car weighing 0.5 pound zips 20 yards away from a child in just one second . How much force did the toy exhibit when it got away formats young owner ? Kilogram = 2.2 pounds , 1 meter = 3.28 feet .
Physics Force & Laws Of Motion Level: High School
Circular Motion
An 85 kg Tarzan plans to cross a gorge by swinging on a 4-meter long vine . If the vine can hold no more than 1.50 x 10^3 N , what is the maximum velocity Tarzan can have when swimming across the gorge ?
Physics Force & Laws Of Motion Level: High School
Circular Motion
A racecar of mass equal to 1.20 x 10^3 kg travels around a circular racetrack that has a radius of 75.0 meters . The car moves around the track at 5 revolutions every 200.0 sec .a) Calculate the frictional force necessary to keep the car moving in its circular path ?
b) If the velocity of the car is traveling at the maximum it can have without skidding, what is the coefficient of friction between the track and car’s tires ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
Two blocks , masses m1 and m2 , are connected by a massless cord (see the figure at “click here”) . If the two blocks are accelerated uniformly on a frictionless surface by applying a force of magnitude T2 to a second cord connected to m2 , what is the ratio of the tensions in the two cord in the terms of the masses ? T1/T2 = ?
Physics Force & Laws Of Motion Level: High School
Friction
A drag race crosses the finish line of a 400.0 m track with a final speed of 104 m/s .a) Assuming constant acceleration during the race , find the racer’s time and the minimum coefficient of static friction between the tire and the road .
b) If , because of bad tire or wet pavement , the acceleration were 30.0% smaller , how long would it take to finish the race ?
Physics Force & Laws Of Motion Level: High School
Pulley and Mass
In the figure which is show at “click here” the block of mass m1 slides to the right with coefficient of kinetic friction micro k on a horizontal surface . The block is connected to a hanging block of mass m2 by a light cord that passes over a slight , frictionless pulley .a) Find the acceleration of each o the blocks and tension in the cord
b) Check your answers in the special cases m1< c) For what value of m2(if any) do the two blocks slides at constant velocity ? What is the tension in the cord in that case ?
