P10(Force And Motion)

Question 1

What is Newton’s second law

Answer 1

The acceleration of an object is
-proportional to the resultant force on the object
-inversely proportional to the mass of the object

Question 2

What is inertia

Answer 2

The tendency of an object to stay at rest to continue in uniform motion(moving at constant velocity)

Question 3

The inertial mass of an object is …

Answer 3

A measure of the difficulty of changing the objects velocity

Question 4

What’s the formula for inertial mass

Answer 4

Question 5

What’s the formula for resultant force acting on an object

Answer 5

Question 6

The greater the resultant force on an object…

Answer 6

The greater the objects acceleration

Question 7

The greater the mass of an object …

Answer 7

The smaller it’s acceleration for a given force

Question 8

The velocity of an object decreases if …

Answer 8

The resultant force is in the opposite direction to its velocity

Question 9

What is the formula for momentum

Answer 9

P= mv

Question 10

In a closed system…

Answer 10

The total momentum before an event is equal to the total momentum after the event

Question 11

What’s the formula for the conservation of momentum

Answer 11

Ma X Va + Mb X Vb=0

Question 12

What is the conservation of momentum

Answer 12

The total momentum before the event is equal to the total momentum after the event

Question 13

The longer the impact time …

Answer 13

The more the impact force is reduced

Question 14

When two vehicles collide …

Answer 14

-They exert equal and opposite forces on each other
-their total momentum is unchanged

Question 15

What is the formula for impact force

Answer 15

Force= mass X change of velocity/ time taken

Question 16

An object is elastic if …

Answer 16

It returns to its original shape when the forces deforming it are removed

Question 17

What is hookes law

Answer 17

The extension of a spring is directly proportional to the force applied, as long as it’s limit of proportionality is not exceeded

Question 18

What is terminal velocity

Answer 18

When an object moves at a steady speed in a constant direction because the
resultant force acting on it is zero

Question 19

How is terminal velocity reached

Answer 19

-At the start the object accelerates downwards due to the force of gravity
-As the object’s speed increases frictional forces such as air resistance or drag increase
-At terminal velocity the weight of the object due to gravity is balanced by the frictional forces and the resultant force is zero

Question 20

What are the forces on a parachutist

Answer 20

-when parachutist jumps they accelerate due to gravity
-as they accelerate drag increases therefore drag and gravity balance reaching terminal velocity
-they drop at constant speed
-parachute opens increased surface area causes drag to increase
-they decelerate
-eventually both gravity and drag balances reaching terminal velocity again but at much lower altitude

Question 21

What does SUVAT stand for

Answer 21

S=distance
U=initial velocity
V=final velocity
A=acceleration
T=time

Question 22

What is the stopping distance

Answer 22

The total distance travelled during the time it takes for a car to stop in response to some emergency

Question 23

What is the formula for stopping distance

Answer 23

Stopping distance = Thinking distance + Braking distance

Question 24

What is braking distance

Answer 24

the distance travelled under the braking force in metres

Question 25

What is thinking distance

Answer 25

the distance travelled in the time it takes the driver to react

Question 26

What is the 1 SUVAT equation

Answer 26

Question 27

What is the 2nd SUVAT equation

Answer 27

Question 28

What is the 3rd SUVAT equation

Answer 28

Question 29

What is the 4th SUVAT equation

Answer 29

Question 30

Answer 30

Question 31

Answer 31

Question 32

Answer 32

Question 33

Answer 33

Question 34

Answer 34

Question 35

Answer 35

Question 36

Answer 36

Question 37

Answer 37

Question 38

Answer 38