Motion and Forces

Question 1

Vector Quantity

Answer 1

A quantity that has both magnitude and an associated direction

Question 2

Scalar quantity

Answer 2

Just size or magnitude

Question 3

Speed Equation

Answer 3

Average speed = Distance travelled / time taken or V=X/T or to calculate distance travelled by object X = VT

Question 4

What does a horizontal line on a distance time graph mean?

Answer 4

It means the object has stopped moving and is stationary

Question 5

Speed from gradient equation

Answer 5

Speed = Distance / Time

Question 6

Acceleration equation

Answer 6

Acceleration = Change in velocity / Time taken

Question 7

Define Velocity

Answer 7

Velocity is a constant force that has a direction eg: Car moving at 40mph FORWARDS

Question 8

Newtons 1st Law

Answer 8

An object remains in the same state of motion unless a resultant force acts upon it.

Question 9

Newtons second law

Answer 9

F = MA (force = mass x acceleration)

Question 10

Inertial Mass

Answer 10

Inertial mass is a measure of how difficult it is to change the velocity of an object. You use NEWTONS SECOND LAW

Question 11

Newtons 3rd Law

Answer 11

Whenever 2 objects interact they exert equal and opposite forces upon each other.

Question 12

Define Weight

Answer 12

mass x gravity

Question 13

Momentum calculation

Answer 13

P = MV (p= momentum, mass = m, Velocity = V)

Question 14

Describe the conservation of momentum

Answer 14

Total momentum before the event = Total momentum after the event (in a closed system)

Question 15

How do cars minimize the impact in a crash

Answer 15

The force of the collision is equal to the rate of change of momentum. Crumple zones increase the time it takes for the impact to occur, seatbelts stop you from flying out the window and airbags minimize impact by dissipating force through a gas. ALL of them decrease the rate of change of momentum