imp points dynamics Flashcards
What is Newton’s First Law of Motion?
An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.
True or False: Mass is a measure of the amount of matter in an object.
True
What is the formula for calculating force?
Force is calculated using the formula F = ma, where F is force, m is mass, and a is acceleration.
Fill in the blank: The unit of force in the SI system is __________.
Newton
What is the relationship between mass and weight?
Weight is the force exerted by gravity on an object and is calculated as weight = mass × gravitational acceleration.
Which of the following is a vector quantity? A) Mass B) Speed C) Velocity D) Temperature
C) Velocity
What does the term ‘net force’ refer to?
Net force refers to the vector sum of all the forces acting on an object.
True or False: An object can be in equilibrium if it is moving.
True, as long as the net force acting on it is zero.
What is the principle of conservation of momentum?
The total momentum of a closed system remains constant if no external forces act on it.
Fill in the blank: The acceleration due to gravity on Earth is approximately __________ m/s².
9.81
What is the definition of friction?
Friction is the force that opposes the relative motion of two surfaces in contact.
Which law explains the relationship between force and acceleration?
Newton’s Second Law of Motion.
True or False: Kinetic friction is generally greater than static friction.
False
What is the formula for calculating work done?
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.
What is the difference between elastic and inelastic collisions?
In elastic collisions, both momentum and kinetic energy are conserved; in inelastic collisions, momentum is conserved, but kinetic energy is not.
Fill in the blank: The moment of inertia depends on the __________ of the mass distribution.
shape and axis of rotation
What is the formula for calculating gravitational potential energy?
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.
In what scenario is centripetal force necessary?
Centripetal force is necessary for an object to move in a circular path.
True or False: The direction of acceleration is always in the direction of the net force.
True
What does the term ‘torque’ refer to?
Torque is a measure of the rotational force applied to an object.
What is the formula for calculating torque?
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.
Fill in the blank: An object in free fall experiences __________ acceleration due to gravity.
constant
What is the effect of air resistance on falling objects?
Air resistance opposes the motion of falling objects, reducing their acceleration and terminal velocity.
Which of the following is NOT a type of friction? A) Static B) Kinetic C) Rolling D) Linear
D) Linear
What is the relationship between pressure, force, and area?
Pressure is defined as force per unit area, given by the formula P = F/A.
True or False: The slope of a velocity-time graph represents acceleration.
True
