Podcast
Questions and Answers
What happens when an unbalanced force acts on a resting body?
What happens when an unbalanced force acts on a resting body?
- It changes its direction
- It stays still and changes its shape
- It remains in its state of rest
- It starts moving (correct)
What is the condition for the resultant of all forces acting on a body to be zero?
What is the condition for the resultant of all forces acting on a body to be zero?
- When all forces are equal and opposite (correct)
- When all forces act in the same direction
- When the body is in uniform motion
- When there is no force acting on the body
What is the effect of an unbalanced force on a moving body?
What is the effect of an unbalanced force on a moving body?
- It increases its speed
- It remains in uniform motion
- It changes its direction
- It stops or changes its motion (correct)
What is the force of friction that acts on a rolling ball?
What is the force of friction that acts on a rolling ball?
What is the condition for a body to change its state of rest or uniform motion?
What is the condition for a body to change its state of rest or uniform motion?
What happens to the toy car in Fig. 1.2?
What happens to the toy car in Fig. 1.2?
What happens to the team in a tug of war when the other team suddenly releases the rope?
What happens to the team in a tug of war when the other team suddenly releases the rope?
What is the condition for the forces acting on a body to be unbalanced?
What is the condition for the forces acting on a body to be unbalanced?
What is the effect of balanced forces on the state of motion of a body?
What is the effect of balanced forces on the state of motion of a body?
What is the result of all the forces acting on a body when balanced forces are applied?
What is the result of all the forces acting on a body when balanced forces are applied?
What is velocity?
What is velocity?
What does the speed of a bus give us an idea of?
What does the speed of a bus give us an idea of?
What is the difference between speed and velocity?
What is the difference between speed and velocity?
What is the effect of unbalanced forces on a body?
What is the effect of unbalanced forces on a body?
What is the result of all the forces acting on a body when unbalanced forces are applied?
What is the result of all the forces acting on a body when unbalanced forces are applied?
What is crucial to a car's performance and handling?
What is crucial to a car's performance and handling?
What is the characteristic of an object moving with a uniform acceleration?
What is the characteristic of an object moving with a uniform acceleration?
What is the term used to describe the decrease in velocity of a body?
What is the term used to describe the decrease in velocity of a body?
What are the two factors that acceleration depends upon?
What are the two factors that acceleration depends upon?
Which of the following is an example of uniformly accelerated motion?
Which of the following is an example of uniformly accelerated motion?
What happens to the velocity of a body when it undergoes positive acceleration?
What happens to the velocity of a body when it undergoes positive acceleration?
What is the characteristic of an object moving with a non-uniform acceleration?
What is the characteristic of an object moving with a non-uniform acceleration?
Which of the following is NOT a type of acceleration?
Which of the following is NOT a type of acceleration?
What happens to the acceleration of a car when it moves around a curve in the road?
What happens to the acceleration of a car when it moves around a curve in the road?
What is the result of unbalanced forces acting on a body?
What is the result of unbalanced forces acting on a body?
What is the formula for velocity?
What is the formula for velocity?
What is the definition of acceleration?
What is the definition of acceleration?
What is the characteristic of a body with non-uniform acceleration?
What is the characteristic of a body with non-uniform acceleration?
What is the direction of momentum?
What is the direction of momentum?
What is the SI unit of momentum?
What is the SI unit of momentum?
What determines the quantity of motion possessed by a body?
What determines the quantity of motion possessed by a body?
What is the time period of a simple pendulum dependent on?
What is the time period of a simple pendulum dependent on?
What is the formula for pressure at a point in a liquid?
What is the formula for pressure at a point in a liquid?
What is the direction of the force applied by the pressure at a point in a liquid?
What is the direction of the force applied by the pressure at a point in a liquid?
What is the effect of density on the pressure at a point in a liquid?
What is the effect of density on the pressure at a point in a liquid?
What is the relationship between pressure and height of the liquid column?
What is the relationship between pressure and height of the liquid column?
What is the effect of acceleration due to gravity on the pressure at a point in a liquid?
What is the effect of acceleration due to gravity on the pressure at a point in a liquid?
Why do objects become lighter in water?
Why do objects become lighter in water?
What is the shape of the container that affects the pressure at a point in a liquid?
What is the shape of the container that affects the pressure at a point in a liquid?
What is the unit of atmospheric pressure normally given in weather reports?
What is the unit of atmospheric pressure normally given in weather reports?
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Study Notes
Forces
- When an unbalanced force acts on a resting body, it produces motion.
- Unbalanced forces are forces in which the resultant of all the forces acting on a body is not zero.
- Unbalanced forces can change the state of rest or uniform motion in a straight line.
Balanced and Unbalanced Forces
- Balanced forces do not change the state of rest or motion of a body.
- Balanced forces do not produce acceleration or deceleration.
- Balanced forces can change the shape of the body but not the direction of motion.
- The resultant of all the forces acting on a body is zero in balanced forces.
Velocity
- Velocity is the distance travelled by a body per unit time in a specified direction.
- Velocity tells us how fast a body is moving along a particular direction.
- Speed gives us an idea of how fast a body is moving, but it does not tell us the direction.
Acceleration
- If the change in velocity of a moving object is equal in equal intervals of time, the object is said to be moving with a uniform acceleration.
- Uniform acceleration is when a body travels in a straight line and its velocity increases by equal amounts in equal intervals of time.
- Non-uniform acceleration is when the change in velocity of a moving object is not equal in equal intervals of time.
Retardation
- Retardation is also known as deceleration or negative acceleration.
- If the velocity of a body decreases, the acceleration is negative.
Momentum
- Momentum of a body at rest is zero.
- Momentum is a vector quantity, possessing both magnitude and direction.
- The direction of momentum is the same as the direction of velocity.
- The SI unit of momentum is kilogram meter per second (kgm/s).
- Momentum depends on both mass and velocity.
Pressure
- Pressure at a point vertically beneath the surface of a liquid is given by P = h ρ g.
- Factors affecting the pressure at a point in a liquid are:
- Depth of the point below the free surface (height of the liquid column)
- Density of the liquid
- Acceleration due to gravity
- Pressure at a point at a certain depth in a liquid:
- Is same in all directions
- Applies force at 90° to any contact surface
- Does not depend on the shape of the container
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