Question 1

Two blocks are connected by a string and pulley as shown.Assuming that the string and pulley are massless, the magnitude of the acceleration of each block is:

Accepted Answer

A) 0.049 m/s2 
B) 0.020 m/s2 
C) 0.0098 m/s2 
D) 0.54 m/s2 
E) 0.98 m/s2 
A) 0.049 m/s2 
B) 0.020 m/s2 
C) 0.0098 m/s2 
D) 0.54 m/s2 
E) 0.98 m/s2 E

Question 2

Acceleration is always in the direction:

Accepted Answer

A) of the displacement 
B) of the initial velocity 
C) of the final velocity 
D) of the net force 
E) opposite to the frictional force 
A) of the displacement 
B) of the initial velocity 
C) of the final velocity 
D) of the net force 
E) opposite to the frictional force D

Question 3

An example of an inertial reference frame is:

Accepted Answer

A) any reference frame that is not accelerating 
B) a frame attached to a particle on which there are no forces 
C) any reference frame that is at rest 
D) a reference frame attached to the center of the universe 
E) a reference frame attached to the Earth 
A) any reference frame that is not accelerating 
B) a frame attached to a particle on which there are no forces 
C) any reference frame that is at rest 
D) a reference frame attached to the center of the universe 
E) a reference frame attached to the Earth B

Question 4

A massless rope passes over a massless pulley suspended from the ceiling.A 4-kg block is attached to one end and a 5-kg block is attached to the other end.The acceleration of the 5-kg block is:

Accepted Answer

A) g/4 
B) 5g/9 
C) 4g/9 
D) g/5 
E) g/9 
A) g/4 
B) 5g/9 
C) 4g/9 
D) g/5 
E) g/9

Question 5

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown.The tension in the string is:

Accepted Answer

A) 210 N 
B) 290 N 
C) 410 N 
D) 500 N 
E) 4900 N 
A) 210 N 
B) 290 N 
C) 410 N 
D) 500 N 
E) 4900 N

Question 6

Which of the following is a correct statement of Newton's first law?

Accepted Answer

A) An object in motion will continue in motion at a constant speed unless acted on by a net external force. 
B) An object at rest will stay at rest unless acted on by a net internal force. 
C) An object in motion will continue in motion at a constant velocity unless acted on by a net internal force. 
D) An object in motion will continue in motion at a constant velocity unless acted on by a net external force. 
E) Everything has inertia. 
A) An object in motion will continue in motion at a constant speed unless acted on by a net external force. 
B) An object at rest will stay at rest unless acted on by a net internal force. 
C) An object in motion will continue in motion at a constant velocity unless acted on by a net internal force. 
D) An object in motion will continue in motion at a constant velocity unless acted on by a net external force. 
E) Everything has inertia.

Question 7

A feather and a lead ball are dropped from rest in vacuum on the Moon.The acceleration of the feather is:

Accepted Answer

A) more than that of the lead ball 
B) the same as that of the lead ball 
C) less than that of the lead ball 
D) 9.8 m/s2 
E) zero since it floats in a vacuum 
A) more than that of the lead ball 
B) the same as that of the lead ball 
C) less than that of the lead ball 
D) 9.8 m/s2 
E) zero since it floats in a vacuum

Question 8

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2.The tension in the cable is:

Accepted Answer

A) 4900 N 
B) 11,000 N 
C) 16,000 N 
D) 21,000 N 
E) 48,000 N 
A) 4900 N 
B) 11,000 N 
C) 16,000 N 
D) 21,000 N 
E) 48,000 N

Question 9

A 6-kg object is moving south.A net force of 12 N north on it result in the object having an acceleration of:

Accepted Answer

A) 2 m/s2, north 
B) 2 m/s2, south 
C) 6 m/s2, north 
D) 18 m/s2, north 
E) 18 m/s2, south 
A) 2 m/s2, north 
B) 2 m/s2, south 
C) 6 m/s2, north 
D) 18 m/s2, north 
E) 18 m/s2, south

Question 10

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west.The magnitude of the acceleration of the crate is:

Accepted Answer

A) 0.50 m/s2 
B) 2.0 m/s2 
C) 2.8 m/s2 
D) 10 m/s2 
E) 50 m/s2 
A) 0.50 m/s2 
B) 2.0 m/s2 
C) 2.8 m/s2 
D) 10 m/s2 
E) 50 m/s2

Question 11

An object rests on a horizontal frictionless surface.A net horizontal force of magnitude F is applied.This force produces an acceleration:

Accepted Answer

A) only if F is larger than the weight of the object 
B) only while the object suddenly changes from rest to motion 
C) always 
D) only if the inertia of the object decreases 
E) only if F is increasing 
A) only if F is larger than the weight of the object 
B) only while the object suddenly changes from rest to motion 
C) always 
D) only if the inertia of the object decreases 
E) only if F is increasing

Question 12

Three books (X, Y, and Z)rest on a table.The weight of each book is indicated.The force of book Z on book Y is:

Accepted Answer

A) 0 N 
B) 5 N 
C) 9 N 
D) 14 N 
E) 19 N 
A) 0 N 
B) 5 N 
C) 9 N 
D) 14 N 
E) 19 N

Question 13

A 1-N pendulum bob is held at an angle $\theta$from the vertical by a 2-N horizontal force F as shown.The tension in the string supporting the pendulum bob is:

Accepted Answer

A) 2/N 
B) 2 N 
C) N 
D) 1 N 
E) none of these 
A) 2/N 
B) 2 N 
C) N 
D) 1 N 
E) none of these

Question 14

A newton is the force:

Accepted Answer

A) of gravity on a 1 kg body 
B) of gravity on a 1 g body 
C) that gives a l g body an acceleration of 1 cm/s2 
D) that gives a 1 kg body an acceleration of 1 m/s2 
E) that gives a 1 kg body an acceleration of 9.8 m/s2 
A) of gravity on a 1 kg body 
B) of gravity on a 1 g body 
C) that gives a l g body an acceleration of 1 cm/s2 
D) that gives a 1 kg body an acceleration of 1 m/s2 
E) that gives a 1 kg body an acceleration of 9.8 m/s2

Question 15

A 25-N crate slides down a frictionless incline that is 25$\degree$ above the horizontal.The magnitude of the normal force of the incline on the crate is:

Accepted Answer

A) 11 N 
B) 23 N 
C) 25 N 
D) 100 N 
E) 220 N 
A) 11 N 
B) 23 N 
C) 25 N 
D) 100 N 
E) 220 N

Question 16

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30$\degree$ above the horizontal.The mass of the crate is:

Accepted Answer

A) 3.3 kg 
B) 3.8 kg 
C) 5.7 kg 
D) 6.5 kg 
E) 160 kg 
A) 3.3 kg 
B) 3.8 kg 
C) 5.7 kg 
D) 6.5 kg 
E) 160 kg

Question 17

Mass differs from weight in that:

Accepted Answer

A) all objects have weight but some lack mass 
B) weight is a force and mass is not 
C) the mass of an object is always more than its weight 
D) mass can only be expressed in the metric system 
E) there is no difference 
A) all objects have weight but some lack mass 
B) weight is a force and mass is not 
C) the mass of an object is always more than its weight 
D) mass can only be expressed in the metric system 
E) there is no difference

Question 18

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest.The change in speed of this object will be:

Accepted Answer

A) 0.5 m/s 
B) 2 m/s 
C) 4 m/s 
D) 8 m/s 
E) 32 m/s 
A) 0.5 m/s 
B) 2 m/s 
C) 4 m/s 
D) 8 m/s 
E) 32 m/s

Question 19

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20$\degree$ below the horizontal, the magnitude of the normal force of the floor on the crate is:

Accepted Answer

A) 25 N 
B) 68 N 
C) 180 N 
D) 250 N 
E) 310 N 
A) 25 N 
B) 68 N 
C) 180 N 
D) 250 N 
E) 310 N

Question 20

A car travels east at constant velocity.The net force on the car is:

Accepted Answer

A) east 
B) west 
C) up 
D) down 
E) zero 
A) east 
B) west 
C) up 
D) down 
E) zero

Exam 5: Force and Motion I

Two blocks are connected by a string and pulley as shown.Assuming that the string and pulley are massless, the magnitude of the acceleration of each block is:

Acceleration is always in the direction:

An example of an inertial reference frame is:

A massless rope passes over a massless pulley suspended from the ceiling.A 4-kg block is attached to one end and a 5-kg block is attached to the other end.The acceleration of the 5-kg block is:

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown.The tension in the string is:

Which of the following is a correct statement of Newton's first law?

A feather and a lead ball are dropped from rest in vacuum on the Moon.The acceleration of the feather is:

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2.The tension in the cable is:

A 6-kg object is moving south.A net force of 12 N north on it result in the object having an acceleration of:

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west.The magnitude of the acceleration of the crate is:

An object rests on a horizontal frictionless surface.A net horizontal force of magnitude F is applied.This force produces an acceleration:

Three books (X, Y, and Z)rest on a table.The weight of each book is indicated.The force of book Z on book Y is:

A 1-N pendulum bob is held at an angle θ\thetaθ from the vertical by a 2-N horizontal force F as shown.The tension in the string supporting the pendulum bob is:

A newton is the force:

A 25-N crate slides down a frictionless incline that is 25 °\degree° above the horizontal.The magnitude of the normal force of the incline on the crate is:

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 °\degree° above the horizontal.The mass of the crate is:

Mass differs from weight in that:

A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest.The change in speed of this object will be:

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 °\degree° below the horizontal, the magnitude of the normal force of the floor on the crate is:

A car travels east at constant velocity.The net force on the car is:

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A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s².The tension in the cable is:

A 25-N crate slides down a frictionless incline that is 25 $\degree$ above the horizontal.The magnitude of the normal force of the incline on the crate is:

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 $\degree$ above the horizontal.The mass of the crate is:

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 $\degree$ below the horizontal, the magnitude of the normal force of the floor on the crate is: