Physics

Question 1

Newton’s First Law

Answer 1

An object continues in a state of rest or uniform velocity unless it is acted upon by a net or resultant force.

Question 2

Newton’s Second Law

Answer 2

When a net force, Fnet is applied to an object of mass, m,it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass.

Question 3

Newton’s Third Law

Answer 3

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

Question 4

Vector

Answer 4

A physical quantity that has both magnitude and direction.

Question 5

Scalar

Answer 5

A physical quantity that only has magnitude.

Question 6

Resultant vector

Answer 6

The single vector which has the same effect as all the original vectors acting together.

Question 7

Distance

Answer 7

The length of path travelled.

Question 8

Displacement

Answer 8

Change in position

Question 9

Speed

Answer 9

Rate of change of distance

Question 10

Velocity

Answer 10

Rate of change of displacement

Question 11

Acceleration

Answer 11

Rate of change of velocity

Question 12

Inertia

Answer 12

The property of an object that cause it to resist a change in its state of rest or uniform motion.

Question 13

Weight

Answer 13

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

Question 14

Normal force

Answer 14

The perpendicular force exerted by a surface on an object in contact with it.

Question 15

Frictional force -

Answer 15

The force that opposes the motion of an object.

Question 16

Tension in a string

Answer 16

The tension in a string is the same throughout the entire string

Question 17

Newton’s Law of Universal Gravitation

Answer 17

Every object in the universe attracts every other object in the universe 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 18

Terminal velocity

Answer 18

Frictional force = weight

Question 19

Weight

Answer 19

The gravitational force that the Earth exerts on an object

Question 20

Momentum

Answer 20

The product of the mass and velocity of an object.

Momentum makes something hard to stop. (kg.m.s)

Question 21

Collision

Answer 21

An isolated event in which two or more moving bodies exert forces on each other over a relatively short time.

Question 22

Elastic collision

Answer 22

A collision in which kinetic energy is conserved.

Question 23

Inelastic collision

Answer 23

A collision in which kinetic energy is not conserved