P10- Forces and Motion

Question 1

What does Newtons second Law say?

Answer 1

1) Acceleration is proportional to the resultant force on the object.
2) Inversely proportional to the mass of the object.

Question 2

How do you work out resultant force?

Answer 2

Resultant force = mass x acceleration

(N) = (Kg) x (m/s *2)

Question 3

How can you describe inertial mass?

Answer 3

Acceleration

Question 4

What is the equation used to find out the force?

Answer 4

Force = Mass x Acceleration

Question 5

What is inertia?

Answer 5

1) The tendency for an object to stay at rest OR to continue in uniform motion.

Question 6

What is the equation for weight?

Answer 6

Weight = Mass x Acceleration due to gravity

Question 7

What is the difference between weight and mass?

Answer 7

1) Weight is the force on an object due to gravity. Weight measured in Newtons
2) Mass depends on the quantity of matter. Mass measured in kilograms.

Question 8

What is TERMINAL VELOCITY?

Answer 8

1) Terminal Velocity is the maximum velocity that an object can reach in a FLUID.

Question 9

When can TERMINAL VELOCITY be reached?

Answer 9

1) Can be reached when weight is equal to air resistance which means that you can`t accelerate anymore

Question 10

How can you work out UNIFORM Acceleration?

Answer 10

v2-u2 = 2as

Question 11

What is thinking distance and what is breaking distance?

Answer 11

1) Thinking distance is the distance travelled during the reaction time.
2) Breaking distance is the distance travelled whilst braking.

Question 12

What is the equation used to work out momentum

What unit is momentum measured in?

Answer 12

Momentum = Mass x Velocity

Momentum is measured in kg/m per s

Question 13

What is the formula for the conservation of momentum?

Answer 13

(mass of A x velocity of A) = -(mass of B x velocity of B)

Question 14

What type of quantity is momentum?

Answer 14

1) Vector Quantity

Question 15

How can you work out force with momentum?

Answer 15

1) Force = Change in momentum
————————-
Time

Question 16

What do crumple zones do?

Answer 16

1) Decreases the force.

2) Increases the time taken to change momentum

Question 17

What do air bags do?

Answer 17

1) They decrease the force.

2) Increases the time for the heads momentum to reach 0.

Question 18

What do seat belts do?

Answer 18

1) Increases the time taken for the body`s momentum to reach 0.
2) Decreases the force

Question 19

What is an elastic object?

Answer 19

1) An elastic object is an object which regains its original shape when stretched or squashed.

Question 20

What is proportionality?

Answer 20

1) Proportionality is 2 variables which have a constant ratio to eachother.

Question 21

How do you work out the FORCE APPLIED? (Hookes Law)

Answer 21

1) Force Applied = Spring Constant x Extension

Question 22

Define spring constant

Answer 22

1) Equal to the force per unit extension

Question 23

How do you work out momentum?

Answer 23

1) Momentum = Mass x Velocity

Question 24

What is the equation for work done?

Answer 24

1) Work Done = Force x Distance