#3.3 u3aos1 - newton's law of linear motion

Question 1

list three of newton’s laws of motion
3 marks

Answer 1

1st law - inertia
2nd law - acceleration
3rd law - action-reaction

Question 2

what is newton’s first law of motion in overview?
1 mark

Answer 2

law of inertia

Question 3

what is newton’s second law of motion in overview?
1 mark

Answer 3

law of acceleration

Question 4

what is newton’s third law of motion in overview?
1 mark

Answer 4

law of action-reaction

Question 5

intertia
1 mark

Answer 5

tendency for a body to resist a change in its state of motion

Question 6

law of inertia
3 marks

Answer 6

newton’s first law of motion that states
a body will stay at rest or uniform motion in a straight line
unless acted upon by an external force

Question 7

explain the act of kicking a soccer ball with reference to newton’s first law of motion
5 marks

Answer 7

1. the ball stays at rest
2. an external force (player kicking the ball) is acted upon the ball
3. the ball stays in motion
4. an external force (goal) is acted upon the ball to change it’s state of motion.

Question 8

acceleration
1 mark

Answer 8

the speeding up of an object.

Question 9

law of acceleration
5 marks

Answer 9

newton’s second law of motion
that a force applied to an object will produce a change in acceleration
in the direction of the applied force
being directionally proportional to the size of the force
acceleration = force/mass

Question 10

acceleration formula
1 mark

Answer 10

acceleration = force/mass

Question 11

relationship between force and mass in terms of acceleration
2 marks

Answer 11

increased force = increased acceleration
increased mass = decreased acceleration

Question 12

explain whether a metal toy car or a plastic toy car would have greater acceleration with reference to newton’s second law of motion
4 marks

Answer 12

the plastic toy car will have greater acceleration
as it contains a lower mass in comparison to the metal car
which would make it easier to apply force on
resulting to a higher acceleration.

Question 13

law of action-reaction
2 marks

Answer 13

newton’s third law of motion
that states every action has an equal and opposite reaction

Question 14

explain the action of a diver making her takeoff with reference to newton’s third law of motion
3 marks

Answer 14

as the diver exerts force onto the springboard (action)
the board returns the force and she propells in the air before landing in the pool (reaction

Question 15

first law of angular motion
2 marks

Answer 15

the ANGULAR MOMENTUM of the body reamins constant
unless acted upon an external TORQUE

Question 16

second law of angular motion
4 marks

Answer 16

TORQUE applied to an object will produce
a change in ANGULAR MOTION in the direction of the applied TORQUE
that is directly proportional to the size of the TORQUE
aind inversely proportional to the MOMENT OF INERTIA

Question 17

third law of angular motion
1 mark

Answer 17

for every TORQUE there is an equal and opposite TORQUE