Physics Force & Laws Of Motion Level: High School
A 2.80 kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60.0 degree with the surface . It bounces off with the same speed and angle . If the ball is in contact with the wall for 0.180 s , What is the average force exerted on the ball by the wall ?
Physics Force & Laws Of Motion Level: High School
Consider a rocket consumes 12 tons of fuel per second ; which it exhausts at 6500 ft/s . Calculate the thrust (upward force) exerted on the rocket . Compute force in pounds .
Physics Force & Laws Of Motion Level: High School
A 75 kg box in pulled up a ramp 25 meter long and is 6 meter high by a constant force of 150N . If the box starts from the rest and has a speed of 5.0 m/s at the top . Calculate the force of friction between the box and the ramp . Compute in MKS system .
Physics Force & Laws Of Motion Level: High School
A cylinder shell has a radius , r , a and a mass , m . It is released from rest and moves down the inclined plane .a. Assume first that the plane is frictionless and that the cylinder shell slides down the plane . Calculate the speed of the shell at the bottom of the plane .
b. Now assume that the plane causes the shell to roll without slipping from its initial position . Again calculate its speed at the bottom of the plane . Again assume the shell starts form rest .
c. Explain in less than 50 words the physical reasons for any difference between the answers to Part (a) and (b).
Physics Force & Laws Of Motion Level: High School
A subway train consists of three cars, each having a mass of 15000 kg . The first car , acting as the engine, pulls ahead with a traction force of 42000 Newtons . Friction exerts a backwards drag of 900 Newtons on each car .a. What is the acceleration of the train.
b. What is the tension Tsub 1 in the coupling between car 1 and car 2 ?
c. If the train started at rest, what is the speed at t = 10 sec ?
d. If the train started at position x = 0 , what is the position at t = 10 sec ?
Physics Force & Laws Of Motion Level: High School
A lunar vehicle is tested on Earth at a speed of 10 km/h . When it travels as fast on the Moon , is it momentum more , less , or the same ?Physics Force & Laws Of Motion Level: High School
Which teams wins in tug-of-war, the team that pulls harder on the rope , or the team that pushes harder against the ground ?Physics Force & Laws Of Motion Level: High School
Does a baseball bat slow down when it hits a ball ?a. Yes, a baseball exerts an external force on the bat; thus decelerating the bat.
b. No, the more massive bat is physically unimpeded by the baseball.
c. Yes, a baseball and bat interaction is best described by Newton’s Universal Gravitational Law.
d. No, the mass differential is more driven by the acceleration of the two.
e. Yes, but it is directly proportional to the location of the centers of mass of the two objects.
Physics Force & Laws Of Motion Level: High School
The ideal Atwood machine has a massless , frictionless pulley and a massless rope . The mass of block A is 5.0 kg , and the mass of block B is 7.0 kg . The magnitude of acceleration of block B is :a. 1.0 m/s^2
b. 1.64 m/s^2
c. 4.90 m/s^2
d. 9.81 m/s^2
e. 58.9 m/s^2
Physics Force & Laws Of Motion Level: High School
A body in a system which obeys Newton’s Second Law is acted upon by a net force of zero Newtons . Which of the following statement about its motion is true ?a. The acceleration of the body must be zero .
b. The acceleration of body must be non-zero .
c. The velocity of the body must be zero .
e. Both a and c are true .
Physics Force & Laws Of Motion Level: High School
Which of the following are inertial reference frames ?a. A non-accelerating reference frame .
b. A reference frame moving at a constant velocity .
c. A reference frame at rest .
d. A reference frame in which Newton’s Law are valid .
e. All of the above .
f. Only a,b and c are true .
Physics Force & Laws Of Motion Level: High School
A collision of a 10-kg body with a wall takes 0.01 –s . The collision force given by F(t) = 10^4 e^t Newtons causes a change in velocity of 10.1 m/s . What is the impulse imparted to the body ?a. 10 kg-m/s
b. 1010 kg-m/s
c. 0.101 kg-m/s
d. 10^4 kg-m/s
e. 101 kg-m/s
Physics Force & Laws Of Motion Level: High School
A certain string is breaks when it is subjected to 400 N tension. A boy uses this string to whirl a 5.0 kg stone in a horizontal circle of radius 5.0m. The boy continuously increases the speed of the stone. At approximately what speed will the string break ?(a)10 m/s
(b)20 m/s
(c)80 m/s
(d)100 m/s (1.0 x 10^2 m.s)
(e)400 m/s (4.0 x 10^2 m/s)
What is the rotation rate (revolutions per minute (rpm) of the stone just before the string breaks ?
(f) 0.050 rpm,
(g) 0.64 rpm,
(h) 1.6 rpm,
(i) 38 rpm,
(j) 60 rpm
Physics Force & Laws Of Motion Level: High School
block of wood is sliding down a plane which is inclined 50.0 degree with respect to the ground . The coefficient of kinetic friction between the block of the wood and the inclined plane is 0.125 . Find the acceleration of the block .
Physics Force & Laws Of Motion Level: High School
The ball in the figure as shown at “click here” is supported by the two massless cables You are told that the weight of the ball is 175 N . What are the tensions in the cable 1 and cable 2 ? With the information gives to you , do the tensions depend on whether or not this problem is being solved on Earth or Zarkon ? Assume that this situation is on Zarkon , what is the mass of the ball ?