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Practice Questions - 1

Subject: Physics  |  Grade: 11  |  Topic: Newton's Laws of Motion

Practice Questions

PRACTICE QUESTION 1
Vectors K and L have magnitudes 7 units and 5 units, respectively, as shown in the figure. Calculate the magnitude and direction of the resultant vector R = K + L.
K L
PRACTICE QUESTION 2
R is the resultant of two vectors A and B, where R = A + B. The vectors R and A are shown in the figure. Find the components of vector B.
R A
PRACTICE QUESTION 3
The resultant of vectors K, L, and M is zero. The magnitudes of vectors K and L are both 5 units. Find the magnitude of vector M.
M K L 137
PRACTICE QUESTION 4
The magnitudes and directions of some forces acting on an object on a frictionless surface are shown in the figures below. Find the net force in each case.
F₂ = 4 NF₁ = 4 N(a) F₁ = 4 NF₂ = 4 N(b) F₁ = 4 NF₂ = 4 N60°60°(c)
PRACTICE QUESTION 5
In the diagram, three forces act on an object. Find the net force on the object.
NORTH SOUTH WEST EAST F₁ = 10 N F₂ = 5 N F₃ = 7 N 53° 37° 45°
PRACTICE QUESTION 6
A block on a smooth horizontal surface is connected by a string over a pulley to a hanging mass.
6.1 Find the acceleration of the system.
6.2 Find the tension in the string.
m₁ = 3 kg m₂ = 1 kg Smooth surface
PRACTICE QUESTION 7
If the inclined plane is frictionless and the angle to the horizontal is 37°, find the acceleration of the car with a total mass of 320 kg.
37°
PRACTICE QUESTION 8
Two blocks, m₁ and m₂, 5 kg each, are attached to each other with a string. They are placed on an inclined frictionless plane, as shown in the figure, and then released.
8.1 Find the acceleration gained by the system.
8.2 Find the tension in the string.
37° m₁ m₂
PRACTICE QUESTION 9
Neglecting friction of the system shown in the figure, find the acceleration of the system and the tension in the string.
9.1 Find the acceleration of the system.
9.2 Find the tension in the string.
m₂ = 3 kg m₁ = 2 kg
PRACTICE QUESTION 10
Neglecting friction of the system shown in the figure, find the acceleration of the object and the tension in the string.
10.1 Find the acceleration of the object.
10.2 Find the tension in the string.
m = 2 kg f = 30 N
PRACTICE QUESTION 11
A young man pulls a 50 kg box on a rough horizontal surface with an angle of 38°. If the kinetic friction between the box and the surface is 25 N, what is the acceleration of the box?
A person pulling a crate with an applied force at an angle
PRACTICE QUESTION 12
The distance between two cars, one weighing 1200 kg and the other 1500 kg, is 100 m. Determine the gravitational force between these cars.
Two cars separated by a distance for a gravitational force question
PRACTICE QUESTION 13
Two boxes, mₐ and mᵦ, are pulled by a man who applies a force of 30 N along a horizontal surface, as shown in the figure. The coefficient of kinetic friction between the two boxes and the surface is 0.2.
13.1 What is the acceleration of the system?
13.2 Find the tension in the string connecting the objects.
Two connected blocks pulled by an applied force
PRACTICE QUESTION 14
If the mass of Earth is 6 × 10²⁴ kg and the mass of the Moon is 7 × 10²² kg, and the distance between their centers is 384 000 km, calculate the gravitational force acting between them.
Gravitational force between Earth and another celestial body
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