Physics

Question 1

what is the definition of speed?

Answer 1

How fast you are going

Question 2

what is the definition of velocity?

Answer 2

how fast you are going, in a given direction.

Question 3

what is acceleration?

Answer 3

how quickly the velocity is changing.

Question 4

what is the formula for acceleration?

Answer 4

acceleration = change in velocity / time taken

Question 5

what is gravitational force?

Answer 5

the force of attraction between all masses

Question 6

what is the acceleration of gravity on earth?

Answer 6

10 m/s squared

Question 7

what is mass?

Answer 7

mass is the amount of stuff in an object- how heavier something is..

Question 8

what is weight?

Answer 8

weight is the pull of the gravitational force

Question 9

what is the formula relating mass, weight and gravity?

Answer 9

weight = mass x gravitational field strength

Question 10

what is mass, weight and gravitational field strengths units?

Answer 10

mass = kg
weight= Newtons
GFS= N/Kg

Question 11

what is the resultant force?

Answer 11

the overall force on a point or object

Question 12

how do you find the resultant force?

Answer 12

subtract the smaller number away from the bigger one.

Question 13

what happens if there is no resultant force?

Answer 13

the object is moving at a constant velocity

Question 14

what happens when there is a non zero resultant force?

Answer 14

the object is accelerating in the direction of the force,

Question 15

when two objects interact the forces they exert on each other are…?

Answer 15

equal and opposite.

Question 16

what is friction?

Answer 16

friction is between two surfaces in contact which slows things down.

Question 17

what is terminal velocity?

Answer 17

the force of gravity is much more than the frictional force when the object set off, so they accelerate, after this the frictional force begins to balance with the gravity. this reduces the acceleration and once the frictional force is equal to the gravitational force the object will not accelerate anymore .. it has therefore reached its terminal velocity.

Question 18

what is the two main factors that affect thinking distance?

Answer 18

1) how fast your going

2) how dopey you are ( affected by alcohol, tiredness, drugs or careless attitude)

Question 19

what is the four main factors affecting breaking distance?

Answer 19

1) how fast you’re going
2) how good your brakes are
3) how good your tyres are
4) how good the grip is (dependant on the weather, road surface and tyres)

Question 20

what happens when a force moves an object through a distance?

Answer 20

energy is transferred and work is done

Question 21

what is kinetic energy?

Answer 21

energy of movement

Question 22

what does the kinetic energy of something depend on?

Answer 22

mass and speed.