Topic 5 - Forces Flashcards
1
Q
How is a scalar quantity different from a vector quantity?
A
A scalar quantity has magnitude only, a vector quantity has direction and magnitude.
2
Q
Use an example to explain what is meant by ‘non-contact force’
A
Non-contact forces can occur when objects are not touching, such as gravity.
3
Q
An astronaut with a mass of 80 kg stands on the moon. What is his weight? (g = 1.6N/kg)
A
128N
4
Q
A car travels in a straight line to the east with a driving force of 500N. If the total frictional forces are 400N, what is the resultant force and in which direction does it act?
A
100N eastwards
