motion and forces

Question 1

what is newton’s first law

Answer 1

if there is no resultant force acting on an object it will :
Be at rest/stationary
move with constant speed

Question 2

what is newton’s second law

Answer 2

a resultant force will cause an object to accelerate in the direction as the resultant force

Question 3

What is the equation for velocity?

Answer 3

The equation for velocity (v) is

change in displacement
change in time
—————————
change in time
change in displacement

Question 4

What equation describes acceleration?

Answer 4

Acceleration = initial speed minus final speed / time.

Question 5

Define force.

Answer 5

Force is a push or pull acting upon an object as a result of its interaction with another object.

Question 6

What is the equation for force?

Answer 6

The equation for force (F) is F=ma, where m is mass and
a is acceleration.

Question 7

Explain the difference between balanced and unbalanced forces.

Answer 7

Balanced forces result in no change in an object’s motion, whereas unbalanced forces cause acceleration or changes in motion.

Question 8

Explain Newton’s second law of motion and its equation.

Answer 8

Newton’s second law states that the force acting on an object is directly proportional to the rate of change of its momentum. Its equation is F=ma, where F is force, m is mass, and a is acceleration.

Question 9

what is a scalar quantity

Answer 9

a quantity that has magnitude only

Question 10

what is a vector quantity

Answer 10

a quantity that has both magnitude and direction

Question 11

what is speed

Answer 11

speed is the distance travelled per time unit, for average speed use total distance (m/s)

Question 12

what is the rate of change of speed

Answer 12

a measurement to show how quickly speed increases or decreases (m/s squared)

Question 13

displacement

Answer 13

straight line distance in a particular direction (m)

Question 14

velocity

Answer 14

the displacement per unit time (m/s)

Question 15

What is acceleration

Answer 15

change in velocity/speed per unit time (m/s squared)

Question 16

equation for constant speed

Answer 16

speed = total distance/total time

Question 17

equation for average speed

Answer 17

A.S = total distance/total time
A.S = u+v/2

Question 18

equation for rate of change of speed

Answer 18

rocos = initial speed - final speed / time

Question 19

equation for velocity

Answer 19

velocity = displacement/time

Question 20

equation for acceleration and deceleration

Answer 20

a = v-u / t

Question 21

equation for gradient

Answer 21

rise/run

Question 22

what does the gradient slope mean in a distance-time graph

Answer 22

speed

Question 23

what does the horizontal line mean in a distance-time graph

Answer 23

stationary/at rest

Question 24

what does the straight gradient sloop mean in a distance-time graph

Answer 24

constant speed

Question 25

what does the gradient slope mean in a displacement-time graph

Answer 25

velocity

Question 26

what does the straight positive gradient mean in a displacement-time graph

Answer 26

constant velocity forward

Question 27

what does the straight negative gradient mean in a displacement-time graph

Answer 27

constant velocity backwards

Question 28

what does the horizontal line mean in a displacement-time graph

Answer 28

stationary/ at rest

Question 29

what does the gradient sloop mean in a speed-time graph

Answer 29

acceleration

Question 30

what does the straight positive gradient mean in a speed-time graph

Answer 30

increasing speed

Question 31

what does the straight negative gradient mean in a speed-time graph

Answer 31

decreasing speed

Question 32

what does the area under the graph mean in a speed-time graph

Answer 32

distance

Question 33

what time graphs allow negitive values

Answer 33

displacement and velocity

Question 34

what does the straight positive gradient mean in a velocity-time graph

Answer 34

velocity increasing

Question 35

what does the straight negative gradient mean in a velocity-time graph

Answer 35

velocity decreasing

Question 36

what does the gradient sloop mean in a velocity-time graph

Answer 36

acceleration

Question 37

what does the area under the graph mean in a velocity-time graph

Answer 37

displacement

Question 38

definition of a moment of a forces

Answer 38

product of the force and the perpendicular distance between the force and the pivot

Question 39

principle of a moment

Answer 39

for a beam to balance the total sum of the anticlockwise moment has to be equal to the total sum of the clockwise moment

Question 40

equation for moment of a force

Answer 40

Moment of force = F x d

Question 41

equation for principal of moments

Answer 41

cm = acm F1XD1=F2XD2

Question 42

definition for centre of gravity

Answer 42

the point through all the weight of an object appears to act

Question 43

what makes an object stable

Answer 43

wide base low centre of gravity

Question 44

name me the forces acting on a car

Answer 44

friction weight reaction thrust

Question 45

name me the forces acting on a aeroplane

Answer 45

lift weight thrust air resistance

Question 46

name me the forces acting on a running dog and a human holding on to the dog leash

Answer 46

tension weight reaction

Question 47

what is the definition of mass

Answer 47

the amount of matter in a body

Question 48

what is the definition of weight

Answer 48

the force due to the pull of gravity on an object

Question 49

equation for mass

Answer 49

mass = weight/ gravity

Question 50

what is friction

Answer 50

a force with opposes motion

Question 51

equation for newton's second law

Answer 51

force = mass x acceleration

Question 52

definition for Hooke's law

Answer 52

the extension of the spring in directly proportional to the force applied, provided the limit of proportionality has not been exceeded

Question 53

equation for hooke's law

Answer 53

spring force = spring constant x spring stretch or compressed f=kx

Question 54

limit of proportionality

Answer 54

the point where a spring losses its elastic behaviour