Scalars, Vectors and Forces

Question 1

What is a scalar

Answer 1

Is a quantity that has size only

Question 2

What is a vector

Answer 2

Is a quantity that has both a size and a direction

Question 3

Examples of scalars

Answer 3

Speed, distance, volume, time and energy

Question 4

Examples of vectors

Answer 4

Velocity (speed in a direction), displacement (distance+ direction), force and acceleration

Question 5

What are contact forces?

Answer 5

If two objects must touch to interact the forces are called contact forces

Question 6

Contact forces examples

Answer 6

Friction, tension, air resistance and thrust

Question 7

Non-contact forces examples

Answer 7

Gravity, magnetic and elecrostatic

Question 8

Newton’s first law

Answer 8

A body will remain at rest, or move with a constant speed (velocity), until a force acts on it.
A balanced force means the object will not move or move with a constant speed.
An unbalanced force means the object will speed up (accelerate) or slow down (decelerate)

Question 9

Centre of mass

Answer 9

Is the point at which its mass can be thought of as being concentrated and where all the lines of symmetry meet.

Question 10

Speed

Answer 10

Is the rate of change of distance for the object

Question 11

How to work out speed

Answer 11

V(speed)m/s=S(distance)m
———–
T(time)s

Question 12

Acceleration

Answer 12

Is the rate of change of velocity for the object.

Question 13

How to work out acceleration

Answer 13

A(acceleration m/s2]=V(final velocity m/s)-U(initial velocity m/s)
———————–
T(time s)