imp points dynamics

Question 1

What is Newton’s First Law of Motion?

Answer 1

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

Question 2

True or False: Mass is a measure of the amount of matter in an object.

Answer 2

True

Question 3

What is the formula for calculating force?

Answer 3

Force is calculated using the formula F = ma, where F is force, m is mass, and a is acceleration.

Question 4

Fill in the blank: The unit of force in the SI system is __________.

Answer 4

Newton

Question 5

What is the relationship between mass and weight?

Answer 5

Weight is the force exerted by gravity on an object and is calculated as weight = mass × gravitational acceleration.

Question 6

Which of the following is a vector quantity? A) Mass B) Speed C) Velocity D) Temperature

Answer 6

C) Velocity

Question 7

What does the term ‘net force’ refer to?

Answer 7

Net force refers to the vector sum of all the forces acting on an object.

Question 8

True or False: An object can be in equilibrium if it is moving.

Answer 8

True, as long as the net force acting on it is zero.

Question 9

What is the principle of conservation of momentum?

Answer 9

The total momentum of a closed system remains constant if no external forces act on it.

Question 10

Fill in the blank: The acceleration due to gravity on Earth is approximately __________ m/s².

Answer 10

9.81

Question 11

What is the definition of friction?

Answer 11

Friction is the force that opposes the relative motion of two surfaces in contact.

Question 12

Which law explains the relationship between force and acceleration?

Answer 12

Newton’s Second Law of Motion.

Question 13

True or False: Kinetic friction is generally greater than static friction.

Answer 13

False

Question 14

What is the formula for calculating work done?

Answer 14

Work is calculated using the formula W = Fd cos(θ), where W is work, F is force, d is distance, and θ is the angle between the force and displacement.

Question 15

What is the difference between elastic and inelastic collisions?

Answer 15

In elastic collisions, both momentum and kinetic energy are conserved; in inelastic collisions, momentum is conserved, but kinetic energy is not.

Question 16

Fill in the blank: The moment of inertia depends on the __________ of the mass distribution.

Answer 16

shape and axis of rotation

Question 17

What is the formula for calculating gravitational potential energy?

Answer 17

Gravitational potential energy is calculated using the formula PE = mgh, where PE is potential energy, m is mass, g is the acceleration due to gravity, and h is height.

Question 18

In what scenario is centripetal force necessary?

Answer 18

Centripetal force is necessary for an object to move in a circular path.

Question 19

True or False: The direction of acceleration is always in the direction of the net force.

Answer 19

True

Question 20

What does the term ‘torque’ refer to?

Answer 20

Torque is a measure of the rotational force applied to an object.

Question 21

What is the formula for calculating torque?

Answer 21

Torque is calculated using the formula τ = rF sin(θ), where τ is torque, r is the distance from the pivot point, F is the force applied, and θ is the angle between the force and the lever arm.

Question 22

Fill in the blank: An object in free fall experiences __________ acceleration due to gravity.

Answer 22

constant

Question 23

What is the effect of air resistance on falling objects?

Answer 23

Air resistance opposes the motion of falling objects, reducing their acceleration and terminal velocity.

Question 24

Which of the following is NOT a type of friction? A) Static B) Kinetic C) Rolling D) Linear

Answer 24

D) Linear

Question 25

What is the relationship between pressure, force, and area?

Answer 25

Pressure is defined as force per unit area, given by the formula P = F/A.

Question 26

True or False: The slope of a velocity-time graph represents acceleration.

Answer 26

True