Exam 4: Forces and Newtons Laws of Motion

While flying horizontally in an airplane,you notice that a string dangling from the luggage compartment hangs at rest at 15 degrees away from the vertical.Using this observation,you can conclude that the airplane is an inertial reference frame because the string is not moving.

When a small car is towing a large car by a very light (massless)horizontal rope,the rope exerts equal size forces on both cars.

Two bodies P and Q on a perfectly smooth horizontal surface are connected by a light cord.The mass of P is greater than that of Q.A horizontal force is applied to Q as shown in the figure,accelerating the bodies to the right. The magnitude of the force exerted by the connecting cord on body P will be

The engine of a 1250 kg car provides a forward directed force of 3651 N.If the car accelerates at a rate of 2.60 m/s²,what is the total resistive force (wind resistance,friction,etc. )acting on the car?

In order to lift a bucket of concrete,you must pull up harder on the bucket than it pulls down on you.

Newton's Third Law suggests that a book sitting on a flat table experiences an upward force due to the table.If this is true,why doesn't the book start moving upward?

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point down the ramp.

A Ferrari accelerates from 0 to 100.0 km/h in 4.80 s.What force (in Newtons)does a passenger of mass 68.0 kg experience during acceleration?

A 27 kg object is accelerated at a rate of 1.7 m/s².What force does the object experience?

A ball is tossed vertically upward.When it reaches its highest point (before falling back downward),

A child pulls on a wagon handle at an angle 37° above the horizontal with a force of 45 N.If the wagon accelerates at 8.1 m/s² horizontally,what is the mass of the wagon? Assume frictional forces are negligible.

You throw a stone vertically upward,and it feels no air resistance.Once it is free of your hand but moving upward,the two forces acting on it are the downward pull of gravity and the upward force due to its motion.

You pull on a crate with a rope.If the crate moves,the rope's pull on the crate must have been larger than the crate's pull on the rope,but if the crate does not move,both of these pulls must have been equal.

A small car and an SUV are at a stoplight.The car has a mass equal to half that of the SUV,and the SUV's engine can produce a maximum force equal to twice that of the car.When the light turns green,both drivers floor it at the same time.Which vehicle pulls ahead of the other vehicle after a few seconds?

A 1100 kg car traveling at 27 m/s starts to decelerate and comes to a complete stop in 578.0 m.What is the average braking force acting on the car?

A dog is standing in the tail bed of a pickup truck.The tail bed is coated with ice,causing the force of friction between the dog and the truck to be zero.The truck is initially at rest,and then accelerates to the right,moving along a flat road.As seen from a stationary observer (watching the truck move to the right),the dog

An object accelerates at 7.0 m/s² under the action of two rubber bands.What will be the acceleration of two of these objects glued together if they are pulled by four rubber bands?

On its own,a tow truck has a maximum acceleration of 3.0 ms^-2.What would be the maximum acceleration when the truck was towing a bus of twice its own mass?

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide toward the front of the train.From this observation,you can conclude that this train is not an inertial reference frame because it is slowing down.

An object is moving to the right in a straight line.The net force acting on the object is also directed to the right,but the magnitude of the force is decreasing with time.The object will