Forces and motion (topic 1)

Question 1

Acceleration

Answer 1

rate of change in velocity

Question 2

Balanced forces

Answer 2

resultant force of zero

Question 3

Braking distance

Answer 3

distance a vehicle travels under the braking force.

Question 4

Contact force

Answer 4

force that acts on an object through physical contact

Question 5

Distance - time graphs

Answer 5

plot of how an objects distance changes over time

Question 6

Distance

Answer 6

measure of how far an object moves. its a scalar quantity

Question 7

Distortion

Answer 7

changing of an objects size or shape asa result of a deforming force

Question 8

Elastic deformation

Answer 8

non - permanent deformation for which the object will return to its original shape when deforming forces are removed

Question 9

Elastic limit

Answer 9

force beyond which an object will no longer deform elastically and will deform plastically

Question 10

Equilibrium

Answer 10

object is in equilibrium if the resultant force and resultant moment are equal to zero

Question 11

Friction

Answer 11

resistive contact force that acts to oppose the relative motion between 2 surfaces

Question 12

Hookes law

Answer 12

extension of a spring is directly proportional to the force being applied to it

Question 13

Human reaction time

Answer 13

time it takes for the brain to react to a stimulus

Question 14

Limit of proportionality

Answer 14

point beyond which the extension of an elastic object is no longer directly proportional to the force applied to it

Question 15

Linear relationship

Answer 15

relationship between 2 variables where if one variable increases so does the other by the same factor. they produce a straight line when plotted

Question 16

Newton

Answer 16

device used to measure the magnitude of a force

Question 17

Newton

Answer 17

unit of force

Question 18

Newtons first law

Answer 18

if a stationary objects resultant force is zero the object will remain stationary and if a moving objects resultant force is zero the object will continue to move at a constant velocity

Question 19

Newtons second law

Answer 19

objects acceleration is directly proportional to the resultant force acting on it and is inversely proportional to the objects mass

Question 20

Newtons third law

Answer 20

forces that 2 objects exert on each other when they interact are qual and opposite

Question 21

Non - contact force

Answer 21

force that acts on an object at a distance

Question 22

Plastic deformation

Answer 22

permanent deformation when the object will no longer return to its original shape

Question 23

Resultant force

Answer 23

single force that can replace all the individual forces acting on an object and have the same effect

Question 24

Scalar quantities

Answer 24

quantities that only have a magnitude not a direction

Question 25

Spring constant

Answer 25

measure of a springs stiffness

Question 26

Stopping distance

Answer 26

sum of thinking and braking distance

Question 27

Terminal velocity

Answer 27

maximin velocity an object can reach

Question 28

Thinking distance

Answer 28

distance a vehicle travels during the drivers reaction time

Question 29

Vector quantities

Answer 29

have a magnitude and direction

Question 30

Velocity

Answer 30

vector quantity that measures the rate of change of displacement

Question 31

Weight

Answer 31

force acting on an object due to gravity