Topic 2

Question 1

velocity

Answer 1

the speed in a direction

Question 1

walking speed

Answer 1

1.5 m/s

Question 2

running

Answer 2

< 10 m/s

Question 3

sound

Answer 3

340 m/s

Question 4

light ( vacuum)

Answer 4

3 times 10 to 8

Question 5

difference between mass and weight

Answer 5

• mass is the total amount of matter in an object
• weight is the size of the pull of force of gravity

Question 6

gravitational field strength

Answer 6

10N/Kg

Question 7

scalar quantity

Answer 7

has no direction
only size or magnitude
e.g. mass, volume, speed, density, time

Question 8

vector quantity

Answer 8

has magnitude and direction
e.g. displacement, weight, acceleration, velocity, force

Question 9

difference between displacement and distance

Answer 9

displacement is the shortest distance the objet had moved and the distance is the total distance traveled

Question 10

difference between velocity and speed

Answer 10

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement.

Question 11

velocity

Answer 11

the speed of something in a given direction

Question 12

if an object is in free fall what is its acceleration

Answer 12

10m/s2

Question 13

newton’s first law

Answer 13

an object remains in the same state of motion unless a resultant force acts on it (stationary or constant velocity)

Question 14

newton’s second law

Answer 14

defines a force to be equal to change in momentum (mass times velocity) per change in time

Question 15

weight of body and gravitational field

Answer 15

The weight of an object and its mass are directly proportional. For a given gravitational field strength, the greater the mass of the object, the greater its weight.

Question 16

how is the velocity affected when an object is moving in a circular orbit

Answer 16

changing velocity

Question 17

for a motion in a circle there must be a resultat force known as

Answer 17

centripetal force

Question 18

what direction does centripetal force point

Answer 18

perpendicular to the direction of the object’s displacement

Question 19

inertial mass

Answer 19

a mass parameter giving the inertial resistance to acceleration of the body when responding to all types of force

Question 20

state newton’s third law

Answer 20

or every action (force) in nature there is an equal and opposite reaction

Question 21

examples of momentum in collisions

Answer 21

when a baseball is thrown and the batter hits the ball, both objects are moving and have momentum

Question 22

stopping distance

Answer 22

thinking distance + braking distance

Question 23

factors that affect stopping disatance

Answer 23

• mass of vehicle
• speed of vehicle
• driver’s reaction time
• the state of the vehicle’s breaks
• the state of the road
• the amount of friction between tyre and road surface

Question 24

what affects a driver’s thinking distance

Answer 24

drugs, alcohol, distractions and tiredness, caffeine

Question 25

what effects are large deceleration of a car

Answer 25

may cause the brakes to overheat, and the driver may also lose control of the vehicle

Question 26

how is the stopping distance of an object affected by speed

Answer 26

The faster an object is moving, the greater its stopping distance will be. This is because the braking distance of a vehicle increases

Question 27

Trrolley A and B

Answer 27

measure the mass / weight of the
trolley(s) / weigh the trolley(s) (1)
determine the speed of trolley A (1)
put one light gate (connected to data
logger) further down the runway
than trolley A and another beyond
trolley B (1)
trollies A and B stick together (1)
measure combined velocity / speed
of A and B (1)
calculate momentum of trolley A
before collision and A and B after
collision (1)
check for equality / velocity after
collision is half that before collision
(1)
repeat and take mean / average (1)