What I need to study for test tmr

Question 1

Normal Force

Answer 1

The force or the component of a force which a surface exerts on an object with which it is in contact, and which is perpendicular to the surface.

Question 2

Frictional force

Answer 2

The force that opposes the motion of an object and which acts parallel to the surface.

Question 3

Static frictional force

Answer 3

The force that opposes the tendency of motion of a
stationary object relative to a surface.

Question 4

Know that a frictional force:

Answer 4

Is proportional to the normal force
Is independent of the area of contact
Is independent of the velocity of motion

Question 5

State Newton’s first law of motion:

Answer 5

A body will remain in its state of rest or motion at
constant velocity unless a non-zero resultant/net force acts on it.

Question 6

State Newton’s second law of motion:

Answer 6

When a net force acts on an object, the object
will accelerate in the direction of the force and the acceleration is directly proportional to the force and inversely proportional to the mass of the object.

Question 7

State Newton’s third law of motion:

Answer 7

When object A exerts a force on object B, object B
SIMULTANEOUSLY exerts an oppositely directed force of equal magnitude on object A.

Question 8

State Newton’s Law of Universal Gravitation:

Answer 8

Each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

Question 9

weight

Answer 9

the gravitational force the Earth exerts on any object on or near its
surface.

Question 10

momentum

Answer 10

the product of an object’s mass and its velocity

Question 11

linear momentum

Answer 11

a vector quantity with the same direction as the velocity of the object.

Question 12

State Newton’s second law of motion in terms of momentum:

Answer 12

The net (or resultant) force acting on an object is equal to the rate of change of momentum of the object in the direction of the net force.

Question 13

impulse

Answer 13

the product of the resultant/net force acting on an object and the time the net force acts on the object.

Question 14

isolated system

Answer 14

a system on which the net external force is zero.

Question 15

State the principle of conservation of linear momentum:

Answer 15

The total linear momentum of an isolated system remains constant (is conserved).

Question 16

projectile

Answer 16

an object which has been given an initial velocity and then it moves under the influence of the gravitational force only

Question 17

free fall

Answer 17

motion during which the only force acting on an object is the gravitational force

Question 18

Work-energy theorem:

Answer 18

The work done on an object by a net force is equal to the change in the object’s kinetic energy

Question 19

Conservative Force

Answer 19

A force for which the work done in moving an object between two points is independent of the path taken.

Question 20

non-conservative force

Answer 20

as a force for which the work done in moving an object between two points depends on the path taken.

Question 21

State the principle of conservation of mechanical energy:

Answer 21

The total mechanical energy (sum of gravitational potential energy and kinetic energy) in an isolated system remains constant.

Question 22

power

Answer 22

the rate at which work is done or energy is expended.

Question 23

Doppler effect

Answer 23

the change in frequency (or pitch) of the sound detected by a listener, because the sound source and the listener have different velocities relative to the medium of sound propagation.

Question 24

Coulomb’s law

Answer 24

The magnitude of the electrostatic force exerted by one point charge (Q1) on another point charge (Q2) is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance (r) between them.

Question 25

Electric field

Answer 25

a region of space in which an electric charge experiences a force