P10

Question 1

Braking distance

Answer 1

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

Question 2

Conservation of momentum

Answer 2

in a closed system, the total momentum before an event is equal to the total momentum after the event. Momentum is conserved in any collision or explosion, provided no external forces act on the objects that collide or explode

Question 3

Directly proportional

Answer 3

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

Question 4

Elastic

Answer 4

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

Question 5

Extension

Answer 5

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

Question 6

Gravitational field strength

Answer 6

the force of gravity on an object of mass 1 kg

Question 7

Inertia

Answer 7

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

Question 8

Limit of proportionality

Answer 8

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

Question 9

Mass

Answer 9

the quantity of matter in an object – a measure of the difficulty of changing the motion of an object

Question 10

Momentum

Answer 10

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

Question 11

Newtons second law of motion

Answer 11

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

Question 12

Stopping distance

Answer 12

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

Question 13

Terminal velocity

Answer 13

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

Question 14

Thinking distance

Answer 14

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

Question 15

Weight

Answer 15

the force of gravity on an object