A branch of science that studies the state of rest or motion of bodies under the action of forces.
If an object does not change its position with respect to its surroundings and time.
Example: A building, a book on the table.
If an object changes its position with respect to its surroundings and time.
Example: A moving bus, flowing water.
The total length of the path traveled by an object.
ScalarUnit: meter (m)
The shortest distance between the initial and final position.
VectorUnit: meter (m)
The total distance traveled in a unit of time.
Speed = Distance / Time
ScalarUnit: m/s
The total displacement of an object per unit of time.
Velocity = Displacement / Time
VectorUnit: m/s
The rate of change of velocity.
a = (v-u) / t
VectorUnit: m/s²
An object covers equal distances in equal intervals of time.
Example: A car moving along a straight line at a constant speed.
An object covers unequal distances in equal intervals of time.
Example: A car moving in traffic signals and crowded paths.
For an object moving in a straight line with uniform acceleration:
u = initial velocity (m/s)
v = final velocity (m/s)
a = acceleration (m/s²)
t = time (s)
s = distance traveled (m)
When an object moves with a uniform speed in a circular path.
Example: Hands of a clock, motion of the moon around the Earth.
The angle through which the object rotates. Unit: radians (rad).
The rate of change of angular displacement. Unit: radians/sec.
The rate of change of angular velocity. Unit: rad/sec².
Product of linear momentum and perpendicular distance from the axis of rotation.
A force is a vector quantity with the SI unit of Newton (N).
Effects of Force: It can change the direction, shape, size, or state of motion/rest of an object.
Example: Pulling a door, pushing a cart.
The net force acting towards the centre of a rotating object. It keeps the object in its circular path.
Example: Planets orbiting the sun, a spinning ball on a string.
The apparent force acting away from the centre. It is an effect of inertia.
Example: Cream separator, mud flying off a tyre.
The property of a body to oppose any change in its state of motion or rest.
Example: Moving forward when brakes are applied suddenly.
The product of mass and velocity. It is a vector quantity. (P = m × v)
Unit: kg-m/s
A large force acting on a body for a short interval of time. (I = F × t)
Example: Kicking a ball.
“A body stays in a state of rest or uniform motion unless acted upon by an external unbalanced force.”
“The force produced by an object is directly proportional to the product of its mass and acceleration.” It’s also the rate of change of momentum.
“For every action, there is an equal and opposite reaction.”
Example: Recoil of a gun, rocket propulsion, swimming.
Based on Newton’s Third Law, it states: “In the absence of an external force, the total momentum of a system remains constant.”
Example: Space rocket propulsion.
The force resisting the relative motion between two surfaces in contact. It’s often called a necessary evil.
A force that causes an object to rotate. It is a vector quantity with the unit of Newton-meter (N-m).
1. What is the SI unit of force
2. What remains constant in uniform circular motion
3. What is the acceleration of a body moving with uniform velocity
4. The Newton’s first law is also called as
5. Forces are defined by
6. Working of a rocket is based on the principle of
7. The product of mass and velocity measures
8. According to the law of motion action and reaction always act on
9. If an object covers equal distance in equal intervals of a time is said to be
10. Rate of change of momentum is directly proportional to
11. For every action there is an equal and opposite reaction is stated by
12. The rocket works on the principle of
13. The inertia of a body depends on
14. Force can cause a
15. What is called change in position in a particular direction of an object
16. The rate of change of velocity is called
17. Centripetal force acts along
18. What is the SI unit of momentum
19. If the force acting on a body is doubled what happens to the acceleration
20. In vacuum all freely falling bodies have the same
21. Cream get separated out of milk when it is churned because of
22. A stationary body can have
23. The equation of relation between force mass and acceleration is
24. Newtons second law gives the definition
25. Large force acting on body for short time measures