mechanics

Question 1

what is meant by acceleration?

Answer 1

the rate of change of velocity in a given direction

Question 2

is displacement a vector or a scalar quantity?

Answer 2

vector

Question 3

is distance a vector or a scalar quantity?

Answer 3

scalar

Question 4

is speed a vector or a scalar quantity?

Answer 4

scalar

Question 5

is mass a vector or a scalar quantity?

Answer 5

scalar

Question 6

is temperature a vector or a scalar quantity?

Answer 6

scalar

Question 7

is velocity a vector or a scalar quantity?

Answer 7

vector

Question 8

is force a vector or a scalar quantity?

Answer 8

vector

Question 9

is weight a vector or a scalar quantity?

Answer 9

vector

Question 10

is acceleration a vector or a scalar quantity?

Answer 10

vector

Question 11

what is a couple?

Answer 11

when 2 parallel forces, equal in magnitude but opposite in direction, act to cause an object to rotate

Question 12

what is meant by displacement?

Answer 12

the distance travelled in a particular direction

Question 13

what is equillibrium?

Answer 13

when the sum of all the forces acting on an object is 0 as it has no resultant force

Question 14

in a displacement-time graph, what does the gradient at any point equal to?

Answer 14

the instantaneous velocity at that time

Question 15

in a velocity-time graph, what does the gradient at any point equal to?

Answer 15

the acceleration at that time

Question 16

in a velocity-time graph, what does the area under equal to?

Answer 16

the displacement

Question 17

what is velocity?

Answer 17

the rate of change of displacement

Question 18

in an acceleration-time graph, what does the area under equal to?

Answer 18

the change in velocity

Question 19

what does SUVAT stand for?

Answer 19

s = displacement
u = initial velocity
v = final velocity
a = acceleration
t = time

Question 20

what is newton’s first law?

Answer 20

an object will remain in its current state of motion until it experiences a resultant force

Question 21

what is newton’s second law?

Answer 21

the rate of change of momentum of an object is proportional to the resultant force applied to it and is in the direction of the force

Question 22

what is newton’s third law?

Answer 22

whenever a force is exerted onto an object, an equal and opposite force is applied onto another object

Question 23

what is momentum?

Answer 23

the product of mass and velocity of an object

Question 24

what is a moment?

Answer 24

a turning force

Question 25

what is meant by the centre of mass?

Answer 25

the point where all the mass of an object acts

Question 26

when speed increases, does air resistant increase or decrease?

Answer 26

increase

Question 27

in projectile motion, what is the vertical acceleration equal to? (what units?)

Answer 27

gravitational field strength (g)

Question 28

what is meant by terminal velocity?

Answer 28

when the forces acting on the falling object become balanced, the acceleration becomes 0 and the object is moving at maximum velocity

Question 29

what is the difference between mass and weight?

Answer 29

- mass is scalar, not dependent on the gravity acting upon it and measured in kilograms - weight is a vector, depends on the gravitational field strength and measured in newtons

Question 30

if an object is in equilibrium, what can you say about the object?

Answer 30

it is stationary or moving at a constant velocity

Question 31

what is meant by the principle of conservation of energy?

Answer 31

energy cant be created or destroyed, only transferred into other forms of energy