7. A block of mass 2 kg is pulling along an inclined plane (30°) upwardby a 20N force. Given that the fiction between block and the plane is2N, find the acceleration of the block. (a = 4.1m/s²)238. Mars has a mass of about 6.4 x 10²³ kg, and its moon, Phobos, has amass of about 9.6 x 10¹5 kg. If the magnitude of the gravitationalforce between the two bodies is 4.6 x 10¹5 N, how far apart are Marsand Phobos? (r= 9.2 x 106 m)9. The mass of a ball is 4 times the mass of another ball. When theseballs are separated by a distance of 10 cm, the gravitational forcebetween them is 6.67 x 10-7 N. What are the masses of the two balls?(m₁= 20kg, m₂= 5kg10. The 200N block shown in has constant motion up the plane causedby the horizontal force of 400 N. Determine the coefficient of frictionbetween the contact surfaces. (μ = 0.66)40030°20011. A man is hauling a box of mass 100 kg up a 35° incline by a ropeattached to the top of the box. If the rope makes an angle of 20° tothe incline and the coefficient of friction between the box and theincline is 0.65, calculate the force applied by the man to keep the boxmoving at a constant speed. (F= 1084N)35°20⁰m112. A 5.0-kg block is placed on top of a 10-kg block.A horizontal forceof 45 N is applied to the 10-kg block, and the 4.0 kg block is tied tothe wall. The coefficient of kinetic friction between the movingsurfaces is 0.20. Determine the tension in the string and themagnitude of the acceleration of the 10-kg block. (a = 0.58 m/s², T =9.8 N)5 kg5.0 kg10 kg- F= 45 N13. Two masses, m₁1.65 kg and m₂ = 3.30 kg, attached by a masslessrod parallel to the inclined plane on which they both slide, travelalong the plane. The angle of incline is 30°. The coefficient ofkinetic friction between m, and the incline is u, = 0.226; thatbetween m₂ and the incline is u₂ = 0.113. Compute the tension in therod and the common acceleration of the two masses. (T= 1.06 N, a= 3.62 m/s²)m28= Forces Test Review1. A car is driving at constant speed down the road. The mass of the caris 1200kg and the coefficient of rolling friction is 0.15? How muchengine force is needed to keep the car moving? (F = 1765.8 N)2. A physics student pulls on a 50kg cement block at a speed of 2.2 m/swith a force of 250N. The block hits a rough patch and stops in 0.50seconds. What was the coefficient of friction in the rough patch? (µ= 0.96)3. Find the force between the two blocks (i.e. force of big block onsmall block) if they are accelerating at 3 m/s² to the right as a resultof the pushing force. (NO FRICTION) (F= 15N)Push6 kg4. Find the force in strings A and B for the following train of blocks ifthe train is accelerating at 2 m/s² to the right.(NO FRICTION)(T =12N)0210 kg10 kg10 kg5 kgB5. Find the acceleration of the following pair of connected objects. (a =9.8m/s² [D])4002kgA6. Find the acceleration of the following objects if µ = 0.11. (a =7.64m/s)Pull2007. A block of mass 2 kg is pulling along an inclined plane (30°) upwardby a 20N force. Given that the fiction between block and the plane is2N, find the acceleration of the block. (a = 4.1m/s²)5 kg238. Mars has a mass of about 6.4 x 10²³ kg, and its moon, Phobos, has amass of about 9.6 x 10¹5 kg. If the magnitude of the gravitationalforce between the two bodies is 4.6 x 10¹5 N, how far apart are Marsand Phobos? (r = 9.2 x 106 m)9. The mass of a ball is 4 times the mass of another ball. When theseballs are separated by a distance of 10 cm, the gravitational forcebetween them is 6.67 x 10-7 N. What are the masses of the two balls?(m₁= 20kg, m₂= 5kg10. The 200N block shown in has constant motion up the plane causedby the horizontal force of 400 N. Determine the coefficient of frictionbetween the contact surfaces. (μ = 0.66)

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Description: 7. A block of mass 2 kg is pulling along an inclined plane (30°) upwardby a 20N force. Given that the fiction between block and the plane is2N, find the acceleration of the block. (a = 4.1m/s²)238. Mars has a mass of about 6.4 x 10²³ kg, and its moo

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7. A block of mass 2 kg is pulling along an inclined plane (30°) upward by a 20N force. Given that the fiction between block and the plane is 2N, find the acceleration of the block. (a = 4.1m/s²)

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!

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Question

7. A block of mass 2 kg is pulling along an inclined plane (30°) upward
by a 20N force. Given that the fiction between block and the plane is
2N, find the acceleration of the block. (a = 4.1m/s²)
23
8. Mars has a mass of about 6.4 x 10²³ kg, and its moon, Phobos, has a
mass of about 9.6 x 10¹5 kg. If the magnitude of the gravitational
force between the two bodies is 4.6 x 10¹5 N, how far apart are Mars
and Phobos? (r= 9.2 x 106 m)
9. The mass of a ball is 4 times the mass of another ball. When these
balls are separated by a distance of 10 cm, the gravitational force
between them is 6.67 x 10-7 N. What are the masses of the two balls?
(m₁= 20kg, m₂= 5kg
10. The 200N block shown in has constant motion up the plane caused
by the horizontal force of 400 N. Determine the coefficient of friction
between the contact surfaces. (μ = 0.66)
400
30°
200
11. A man is hauling a box of mass 100 kg up a 35° incline by a rope
attached to the top of the box. If the rope makes an angle of 20° to
the incline and the coefficient of friction between the box and the
incline is 0.65, calculate the force applied by the man to keep the box
moving at a constant speed. (F= 1084N)
35°
20⁰
m1
12. A 5.0-kg block is placed on top of a 10-kg block.A horizontal force
of 45 N is applied to the 10-kg block, and the 4.0 kg block is tied to
the wall. The coefficient of kinetic friction between the moving
surfaces is 0.20. Determine the tension in the string and the
magnitude of the acceleration of the 10-kg block. (a = 0.58 m/s², T =
9.8 N)
5 kg
5.0 kg
10 kg
- F= 45 N
13. Two masses, m₁
1.65 kg and m₂ = 3.30 kg, attached by a massless
rod parallel to the inclined plane on which they both slide, travel
along the plane. The angle of incline is 30°. The coefficient of
kinetic friction between m, and the incline is u, = 0.226; that
between m₂ and the incline is u₂ = 0.113. Compute the tension in the
rod and the common acceleration of the two masses. (T= 1.06 N, a
= 3.62 m/s²)
m2
8
=

Forces Test Review
1. A car is driving at constant speed down the road. The mass of the car
is 1200kg and the coefficient of rolling friction is 0.15? How much
engine force is needed to keep the car moving? (F = 1765.8 N)
2. A physics student pulls on a 50kg cement block at a speed of 2.2 m/s
with a force of 250N. The block hits a rough patch and stops in 0.50
seconds. What was the coefficient of friction in the rough patch? (µ
= 0.96)
3. Find the force between the two blocks (i.e. force of big block on
small block) if they are accelerating at 3 m/s² to the right as a result
of the pushing force. (NO FRICTION) (F= 15N)
Push
6 kg
4. Find the force in strings A and B for the following train of blocks if
the train is accelerating at 2 m/s² to the right.(NO FRICTION)(T =
12N)
02
10 kg
10 kg
10 kg
5 kg
B
5. Find the acceleration of the following pair of connected objects. (a =
9.8m/s² [D])
400
2kg
A
6. Find the acceleration of the following objects if µ = 0.11. (a =
7.64m/s)
Pull
200
7. A block of mass 2 kg is pulling along an inclined plane (30°) upward
by a 20N force. Given that the fiction between block and the plane is
2N, find the acceleration of the block. (a = 4.1m/s²)
5 kg
23
8. Mars has a mass of about 6.4 x 10²³ kg, and its moon, Phobos, has a
mass of about 9.6 x 10¹5 kg. If the magnitude of the gravitational
force between the two bodies is 4.6 x 10¹5 N, how far apart are Mars
and Phobos? (r = 9.2 x 106 m)
9. The mass of a ball is 4 times the mass of another ball. When these
balls are separated by a distance of 10 cm, the gravitational force
between them is 6.67 x 10-7 N. What are the masses of the two balls?
(m₁= 20kg, m₂= 5kg
10. The 200N block shown in has constant motion up the plane caused
by the horizontal force of 400 N. Determine the coefficient of friction
between the contact surfaces. (μ = 0.66)

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