Force And Motion

Question 1

braking distance

Answer 1

the distance travelled by a vehicle during the time it takes for its brakes to act

Question 2

directly proportional

Answer 2

a graph will show this if the line of best fit is a straight line through the origin

Question 3

elastic

Answer 3

a material is elastic if it is able to regain its shape after it has been squashed or stretched

Question 4

extension

Answer 4

the increase in length of a spring (or a strip of material) from its original length

Question 5

gravitational field strength, g

Answer 5

the force of gravity on an object of mass 1 kg (in newtons per kilogram, N/kg). It is also the acceleration of free fall

Question 6

Inertia

Answer 6

the tendency of an object to stay at rest or to continue in uniform motion

Question 7

limit of proportionality

Answer 7

the limit for Hooke’s law applied to the extension of a stretched spring

Question 8

Mass

Answer 8

the quantity of matter in an object – a measure of the difficulty of changing the motion of an object (in kilograms,
kg)

Question 9

Momentum

Answer 9

this equals mass (in kg) x velocity (in m/s)

Question 10

Newtons second law of motion

Answer 10

the acceleration of an object is proportional to the resultant force on the object, and inversely proportional to the
mass of the object

Question 11

stopping distance

Answer 11

the distance travelled by the vehicle in the time it takes for the driver to think and brake

Question 12

terminal velocity

Answer 12

the velocity reached by an object when the drag force on it is equal and opposite to the force making it move

Question 13

thinking distance

Answer 13

the distance travelled by the vehicle in the time it takes the driver to react

Question 14

weight

Answer 14

the force of gravity on an object (in newtons, N)