everything

Question 1

what is a straight line?

Answer 1

constant speed

Question 2

what is a less steep line?

Answer 2

lower constant speed

Question 3

what is a flat/horizontal line?

Answer 3

stationary

Question 4

what is the equation for stopping distance?

Answer 4

thinking distance + breaking distance

Question 5

what are the features of impairing thinking distance?

Answer 5

• alcohol
• tiredness
• visibility

Question 6

what are the impairments of breaking distance?

Answer 6

• weather : icy road (increase) dry road (decrease)
• brake pad quality
• road conditions

Question 7

what is resultant force?

Answer 7

the force produced after forces are balanced.

Question 8

name some forces.

Answer 8

gravity (weight), air resistance, friction, push pull.

Question 9

what is newtons 1st law?

Answer 9

inertia: an object will remain at rest or in uniform motion in a straight line unless acted upon by an external resultant force. (tendency of objects to keep moving in a straight line at constant speed.)

Question 10

what is newtons 2nd law?

Answer 10

the rate of change of momentum is proportional to the (resultant) force applied, and takes place in the direction of the (resultant) force. resultant force = mass x acceleration

Question 11

what is momentum?

Answer 11

momentum is a measure of the ‘amount of motion’ in a body/object. the effect of the force on the velocity of a body depends upon the size of the force and upon the mass of the body.

Question 12

equation for momentum?

Answer 12

mass x velocity

Question 13

what is force?

Answer 13

a change in momentum/time.

Question 14

the bigger the ____ the _____ the effect?

Answer 14

force/greater

Question 15

the _____ the body’s mass the smaller the effect on the body’s _______ .

Answer 15

bigger/speed or velocity

Question 16

what is newtons 3rd law?

Answer 16

if a body A exerts a force on a body B then body B exerts an equal and opposite force on body A.

Question 17

an object can possess energy because of its motion (_____) or position (_____) or deformation (_______).

Answer 17

kinetic energy/gravitational potential energy/elastic energy

Question 18

at the top of a rollercoaster there is _________ and low ________. at the bottom of a rollercoaster there is low __________ and ___________ .

Answer 18

high gravitational potential energy/kinetic energy/gravitational potential energy/high kinetic energy

Question 19

what is work done?

Answer 19

quantity of energy transferred by the force to move an object

Question 20

what is the work done equation?

Answer 20

work = force x distance

Question 21

what is terminal velocity?

Answer 21

the fastest possible speed it is going

Question 22

state the skydiver qer.

Answer 22

• one force which is his weight pushing him down
• as he travels faster, the air resistance increases
• 2 forces become equal. moving the skydiver travels at a constant speed. this is terminal velocity.
• air resistance increases. resultant force is upwards. this makes him slow down.
• 2 forces become equal. there is no resistant force and travels at a constant speed. this is his new terminal velocity.
• when he hits the ground, it pushes up against him for him to decelerate quickly. upwards force is equal to his weight. there is no resultant force