CP2 Forces and Motion

Question 1

What is a vector quantity?

Answer 1

one that has size and a specific direction. i.e. force

Question 2

What is a scalar quantity?

Answer 2

one that has size but no specific direction. i.e. mass

Question 3

What is velocity?

Answer 3

Velocity is speed in a stated direction. Velocity is a vector, speed is a scalar.

Question 4

What is velocity measured in?

Answer 4

metres per second m/s

Question 5

What is the formula for (average) speed?

Answer 5

(average) speed = distance / time

Question 6

What is the formula for gradient?

Answer 6

gradient = change in y / change in x

Question 7

How do you find speed on a distance-time graph?

Answer 7

find the gradient

Question 8

What is the formula for acceleration?

Answer 8

acceleration = change in velocity / time

Question 9

What is acceleration measured in?

Answer 9

m/s2 (metres per second squared)

Question 10

What does v stand for in the acceleration equation?

Answer 10

v - final velocity

Question 11

What does u stand for in the acceleration equation?

Answer 11

u - initial velocity

Question 12

On a velocity-time graph the steeper the gradient the greater the _______________.

Answer 12

acceleration

Question 13

How do you find acceleration on a velocity-time graph?

Answer 13

find the gradient

Question 14

What is the formula for area of a rectangle?

Answer 14

base x height

Question 15

What is the formula for the area of a triangle?

Answer 15

1/2 base x height

Question 16

How do you find distance travelled on a velocity-time graph?

Answer 16

Find the area between the graph line and the time axis

Question 17

How do you use light gates determine the speed of an object?

Answer 17

first measure the length of the object that passes through the gate. Take the time recorded by the light gate. Use the formula speed = distance/time

Question 18

Newtons 1st law part one.: when resultant force on a body is zero it is either ….

Answer 18

… moving at constant speed or is at rest

Question 19

Newtons first law part two: when resultant force on a body is not zero it is ….

Answer 19

… changing speed or direction.

Question 20

What is Newton’s second law (formula for force)?

Answer 20

(resultant) force = mass x acceleration

Question 21

What are forces measured in?

Answer 21

newtons (N)

Question 22

Newton’s third law is about a pair of forces. Give two similaraites between these forces and two differences

Answer 22

They forces are: the same size, the same type of force, in opposite directions, acting on different objects

Question 23

What is Newton’s third law?

Answer 23

When two objects interact they exert equal and opposite forces on each other.

Question 24

Weight is the amount of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . Weight is measured in _ _ _ _ _ _ _ _ _ _.

Answer 24

Weight is the amount of force which gravity pulls on an object with. Weight is measured in Newtons.

Question 25

Mass is the amount of _ _ _ _ _ _ Mass is measured in _ _ _ _ _ _ _ .

Answer 25

Mass is the amount of matter that something is made of. Mass is measured in kilograms (kg).

Question 26

What is the formula for weight?

Answer 26

Weight = mass x gravitational field strength

Question 27

What is the formula for stopping distance?

Answer 27

Stopping distance = thinking distance + braking distance

Question 28

Give 6 factors that affect the stopping distance of a vehicle.

Answer 28

the mass of the vehicle, the speed, the driver's reacation time, the state of the vehicles brakes, the state of the road, the amount of friction between the tyre and the road (i.e.rain)

Question 29

Give 2 factors that increase the driver's reaction time.

Answer 29

Drugs/alcohol , distractions