Topic 2 - Motion and Forces

Question 1

Experimental Methods - Light Gates

Answer 1

-Removes uncertainty when
measuring time
-No human reaction time

Question 2

Experimental Methods - Ruler drop

Answer 2

-Experiment to
measure human
reaction time
- ~ 0.2-0.9
seconds

Question 3

Velocity-Time
graphs

Answer 3

• Gradient =
  Acceleration
• Area = Distance

Question 4

Distance-Time
graphs

Answer 4

Gradient = Speed

Question 5

Vector:
Magnitude and direction

Answer 5

Velocity
Displacement
Momentum
Force
Acceleration

Question 6

Scalar:
Magnitude only

Answer 6

Speed
Distance
Energy

Question 7

Typical speeds

Answer 7

• Walking ~ 1.5 m/s
• Running ~ 3 m/s
• Cycling ~ 6 m/s
• Sound ~ 330 m/s

Question 8

Scalar Equations

Answer 8

• Distance Travelled =
  Average Speed x Time
• Average Speed =
  Distance / Time

Question 9

Newton’s First Law

Answer 9

Velocity of an object only changes if there is a resultant force

Question 10

Newton’s Second Law

Answer 10

The acceleration of an object
is directly proportional to the
resultant force acting on it

Question 11

Newton’s Third Law

Answer 11

The forces on interacting
objects are equal and opposite

Question 12

If resultant force = 0

Answer 12

Object is
stationary OR Object moving
at constant velocity

Question 13

Weight Equation

Answer 13

Weight = Mass x Gravitational Field Strength

Question 14

Weight Measurement

Answer 14

-Measured with
Newton-meter
- Measured in
Newtons