Laws of Motion - SS1 Physics Past Questions and Answers - page 1
According to Newton's first law of motion, an object will remain at rest or in uniform motion in a straight line unless acted upon by a ___________.
gravitational force
net force
frictional force
centripetal force
Newton's second law of motion states that the acceleration of an object is directly proportional to the ___________ applied to it and inversely proportional to its ___________.
Velocity, acceleration
force, mass
mass, velocity
acceleration, force
According to Newton's third law of motion, for every action, there is an equal and opposite ___________.
Force
Reaction
Acceleration
Velocity
Which of the following examples best illustrates Newton's first law of motion?
A car comes to a stop when the brakes are applied
A ball rolls down a hill due to the force of gravity
A person pushes a shopping cart, causing it to move forward
A book remains on a table unless someone pushes it.
An astronaut floating in space experiences no gravitational force because ___________.
there is no air resistance in space
the astronaut is weightless
the astronaut is not in contact with any surface
there is no atmosphere in space
Explain Newton's first law of motion and provide an example to illustrate its application.
Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue to move at a constant velocity in a straight line unless acted upon by an external force. This law essentially describes the concept of inertia, which is the tendency of an object to resist changes in its state of motion.
For example, if a book is placed on a table, it remains at rest until an external force, such as a person pushing it, is applied. Similarly, if a ball is rolling on a smooth surface, it will continue to roll with a constant velocity unless acted upon by a force, such as friction or an applied force.
Explain Newton's second law of motion and provide an example to illustrate its application.
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. Mathematically, it can be expressed as F = ma, where F represents the net force, m represents the mass of the object, and a represents the acceleration produced.
For example, consider a car being pushed with a certain force. According to Newton's second law, if the same force is applied to a smaller car with less mass, it will result in greater acceleration compared to a larger car with more mass. This law helps us understand the relationship between force, mass, and acceleration in various physical scenarios.
Explain Newton's third law of motion and provide an example to illustrate its application.
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that whenever an object exerts a force on another object, the second object exerts a force of equal magnitude but in the opposite direction on the first object.
For example, when you walk, your foot exerts a force backwards on the ground. As a result, according to Newton's third law, the ground exerts an equal and opposite force forward on your foot, propelling you forward. Similarly, when you swim, your arms push the water backward, and in response, the water exerts a force on your arms, propelling you forward.
Which of the following best defines inertia?
The tendency of an object to resist changes in its state of motion
The force required to accelerate an object
The measure of the total quantity of matter in an object
The resistance of an object to gravitational forces.
Which of the following factors affects the inertia of an object?
Acceleration applied to the object.
The size of the object.
The shape of the object.
The mass of the object.