Question 1

A 3 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 5 800 N directed toward the northwest (45° N of W).What is the magnitude of the resultant acceleration?

Accepted Answer

A) 1.4 m/s2 
B) 3.2 m/s2 
C) 2.4 m/s2 
D) 3.4 m/s2 
E) 1.3 m/s2

Question 2

A 200-kg box is placed on a ramp.As one end of the ramp is raised,the box begins to move downward just as the angle of inclination reaches 18.0°.What is the coefficient of static friction between box and ramp?

Accepted Answer

A) 0.42 
B) 0.32 
C) 3.1 
D) 0.27 
E) 62

Question 3

A man pulls a sled at a constant velocity across a horizontal snow surface.If a force of 85 N is being applied to the sled rope at an angle of 56° to the ground,what is the force of friction between sled and snow?

Accepted Answer

A) 85 N 
B) 70 N 
C) 48 N 
D) 5 N 
E) ​43 N

Question 4

A 650-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10.0° with the horizontal.What is the tension in the rope?

Accepted Answer

A) 1 870 N 
B) 660 N 
C) 3 740 N 
D) 226 N 
E) 1 840 N

Question 5

Doug hits a hockey puck,giving it an initial velocity of 6.0 m/s.If the coefficient of kinetic friction between ice and puck is 0.20,how far will the puck slide before stopping?

Accepted Answer

A) 14 m 
B) 19 m 
C) 9 m 
D) 11 m 
E) ​24 m

Question 6

A 7.00-kg mass is placed on a 28.0° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.574,and the coefficient of sliding friction is 0.528.What is the frictional force in this situation?

Accepted Answer

A) 32.2 N 
B) 60.6 N 
C) 32.0 N 
D) 34.8 N 
E) 3.29 N

Question 7

An airplane of mass 1.7 × 104 kg tows a glider of mass 0.9 × 104 kg.The airplane propellers provide a net forward thrust of 4.0 × 104 N.What is the glider's acceleration?

Accepted Answer

A) 1.5 m/s2 
B) 2.4 m/s2 
C) 5.0 m/s2 
D) 4.4 m/s2 
E) 9.8 m/s2

Question 8

A box slides up an incline with an angle of elevation θ.When the box reaches its maximum distance up the incline it stops and does not slide down the incline due to friction.What is the minimum value of the coefficient of static friction for this to occur?

Accepted Answer

A) μs = tanθ 
B) μs = sinθ 
C) μs = cosθ 
D) μs = 1

Question 9

A horizontal force of 850 N is needed to overcome the force of static friction between a level floor and a 350-kg crate.If g = 9.8 m/s2,what is the coefficient of static friction?

Accepted Answer

A) 24.8 
B) 2.48 
C) 4.04 
D) 0.248 
E) 2.43

Question 10

A physics student is riding on a train traveling north.Having read about inertia,the student performs an experiment with a golf ball.He reaches over the aisle and drops the ball from rest.Instead of hitting the floor directly below the student's hand,it hits to the north,i.e. ,forward of that position.Which of the following might be the cause for this to happen?

Accepted Answer

A) The train is moving at constant velocity. 
B) The train is speeding up. 
C) The train is slowing down. 
D) Whatever the cause,it cannot be any of the answers given.

Question 11

Which of the following expresses a principle,which was initially stated by Galileo and was later incorporated into Newton's laws of motion?

Accepted Answer

A) An object's acceleration is inversely proportional to its mass. 
B) For every action there is an equal but opposite reaction. 
C) The natural condition for a moving object is to remain in motion. 
D) The natural condition for a moving object is to come to rest.

Question 12

A cue ball of weight W is falling with an acceleration downward of g/3 and speed v.What is the magnitude of the drag force on the ball at this moment?

Accepted Answer

A)   W 
B)   W 
C)   W 
D) There is insufficient information to solve this problem.

Question 13

A shot-putter moves his arm and the 6.00-kg shot through a distance of 1.25 m,giving the shot a velocity of 8.20 m/s from rest.Find the average force exerted on the shot during this time.

Accepted Answer

A) 323 N 
B) 161 N 
C) 118 N 
D) 12.7 N 
E) 252 N

Question 14

​Which is the correct expression for the force of static friction,where n is the normal force?

Accepted Answer

A) ​ 
B) ​​ 
C)  
D)

Question 15

A 400-N crate rests on a ramp;the maximum angle just before it slips is 15.0° with the horizontal.What is the coefficient of static friction between crate and ramp surfaces?

Accepted Answer

A) 3.7 
B) 0.47 
C) 2.1 
D) 0.27 
E) 0.40

Question 16

A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity.The rope makes an angle of 30° above the horizontal,and the tension in the rope is 100 N.What is the normal force of the floor on the box?

Accepted Answer

A) 350 N 
B) 200 N 
C) 400 N 
D) 250 N 
E) 213 N

Question 17

In the terminology a 500-N block,the 500-N refers to the block's:

Accepted Answer

A) mass. 
B) force. 
C) weight. 
D) None of the above.

Question 18

A 16-kg mass is placed on a 25° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.574 and the coefficient of sliding friction is 0.519.The mass is given a shove causing it to slide down the incline.Taking down the incline as positive,what is the acceleration of the mass while it is sliding?

Accepted Answer

A) 0.47 m/s2 
B) -0.47 m/s2 
C) -0.96 m/s2 
D) 0.96 m/s2 
E) ​14.50 m/s2

Question 19

Two ropes are attached to a 50-kg object.The first rope applies a force of 35 N and the second,55 N.If the two ropes are perpendicular to each other,what is the resultant acceleration of the object?

Accepted Answer

A) 1.3 m/s2 
B) 35 m/s2 
C) 1.8 m/s2 
D) 65 m/s2 
E) 0.77 m/s2

Question 20

An elevator weighing 20 000 N is supported by a steel cable.What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2)

Accepted Answer

A) 6.1E+3 N 
B) 2.0E+4 N 
C) 6.0E+4 N 
D) 2.6E+4 N 
E) 6.7E+3 N

Exam 4: Newtons Laws of Motion

A 3 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 5 800 N directed toward the northwest (45° N of W) .What is the magnitude of the resultant acceleration?

A 200-kg box is placed on a ramp.As one end of the ramp is raised,the box begins to move downward just as the angle of inclination reaches 18.0°.What is the coefficient of static friction between box and ramp?

A man pulls a sled at a constant velocity across a horizontal snow surface.If a force of 85 N is being applied to the sled rope at an angle of 56° to the ground,what is the force of friction between sled and snow?

A 650-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10.0° with the horizontal.What is the tension in the rope?

Doug hits a hockey puck,giving it an initial velocity of 6.0 m/s.If the coefficient of kinetic friction between ice and puck is 0.20,how far will the puck slide before stopping?

A 7.00-kg mass is placed on a 28.0° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.574,and the coefficient of sliding friction is 0.528.What is the frictional force in this situation?

An airplane of mass 1.7 × 10⁴ kg tows a glider of mass 0.9 × 10⁴ kg.The airplane propellers provide a net forward thrust of 4.0 × 10⁴ N.What is the glider's acceleration?

A box slides up an incline with an angle of elevation θ.When the box reaches its maximum distance up the incline it stops and does not slide down the incline due to friction.What is the minimum value of the coefficient of static friction for this to occur?

A horizontal force of 850 N is needed to overcome the force of static friction between a level floor and a 350-kg crate.If g = 9.8 m/s²,what is the coefficient of static friction?

Which of the following expresses a principle,which was initially stated by Galileo and was later incorporated into Newton's laws of motion?

A cue ball of weight W is falling with an acceleration downward of g/3 and speed v.What is the magnitude of the drag force on the ball at this moment?

A shot-putter moves his arm and the 6.00-kg shot through a distance of 1.25 m,giving the shot a velocity of 8.20 m/s from rest.Find the average force exerted on the shot during this time.

Which is the correct expression for the force of static friction,where n is the normal force?

A 400-N crate rests on a ramp;the maximum angle just before it slips is 15.0° with the horizontal.What is the coefficient of static friction between crate and ramp surfaces?

A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity.The rope makes an angle of 30° above the horizontal,and the tension in the rope is 100 N.What is the normal force of the floor on the box?

In the terminology a 500-N block,the 500-N refers to the block's:

Two ropes are attached to a 50-kg object.The first rope applies a force of 35 N and the second,55 N.If the two ropes are perpendicular to each other,what is the resultant acceleration of the object?

An elevator weighing 20 000 N is supported by a steel cable.What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s²? (g = 9.80 m/s²)

Exam 4: Newtons Laws of Motion

A 3 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 5 800 N directed toward the northwest (45° N of W) .What is the magnitude of the resultant acceleration?

A 200-kg box is placed on a ramp.As one end of the ramp is raised,the box begins to move downward just as the angle of inclination reaches 18.0°.What is the coefficient of static friction between box and ramp?

A man pulls a sled at a constant velocity across a horizontal snow surface.If a force of 85 N is being applied to the sled rope at an angle of 56° to the ground,what is the force of friction between sled and snow?

A 650-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10.0° with the horizontal.What is the tension in the rope?

Doug hits a hockey puck,giving it an initial velocity of 6.0 m/s.If the coefficient of kinetic friction between ice and puck is 0.20,how far will the puck slide before stopping?

A 7.00-kg mass is placed on a 28.0° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.574,and the coefficient of sliding friction is 0.528.What is the frictional force in this situation?

An airplane of mass 1.7 × 104 kg tows a glider of mass 0.9 × 104 kg.The airplane propellers provide a net forward thrust of 4.0 × 104 N.What is the glider's acceleration?

A box slides up an incline with an angle of elevation θ.When the box reaches its maximum distance up the incline it stops and does not slide down the incline due to friction.What is the minimum value of the coefficient of static friction for this to occur?

A horizontal force of 850 N is needed to overcome the force of static friction between a level floor and a 350-kg crate.If g = 9.8 m/s2,what is the coefficient of static friction?

Which of the following expresses a principle,which was initially stated by Galileo and was later incorporated into Newton's laws of motion?

A cue ball of weight W is falling with an acceleration downward of g/3 and speed v.What is the magnitude of the drag force on the ball at this moment?

A shot-putter moves his arm and the 6.00-kg shot through a distance of 1.25 m,giving the shot a velocity of 8.20 m/s from rest.Find the average force exerted on the shot during this time.

​Which is the correct expression for the force of static friction,where n is the normal force?

A 400-N crate rests on a ramp;the maximum angle just before it slips is 15.0° with the horizontal.What is the coefficient of static friction between crate and ramp surfaces?

A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity.The rope makes an angle of 30° above the horizontal,and the tension in the rope is 100 N.What is the normal force of the floor on the box?

In the terminology a 500-N block,the 500-N refers to the block's:

Two ropes are attached to a 50-kg object.The first rope applies a force of 35 N and the second,55 N.If the two ropes are perpendicular to each other,what is the resultant acceleration of the object?

An elevator weighing 20 000 N is supported by a steel cable.What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2)

An airplane of mass 1.7 × 10⁴ kg tows a glider of mass 0.9 × 10⁴ kg.The airplane propellers provide a net forward thrust of 4.0 × 10⁴ N.What is the glider's acceleration?

A horizontal force of 850 N is needed to overcome the force of static friction between a level floor and a 350-kg crate.If g = 9.8 m/s²,what is the coefficient of static friction?

Which is the correct expression for the force of static friction,where n is the normal force?

An elevator weighing 20 000 N is supported by a steel cable.What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s²? (g = 9.80 m/s²)