Forces and Motion
4 marks · EasyA force of 10 N is applied to a box of mass 2 kg, causing it to slide across a smooth surface.
State the formula linking force, mass, and acceleration.
Calculate the acceleration of the box.
What is the SI unit for force?
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) F = m × a · must show F = m × a
(b) 5 m/s² m/s^2 · must show a = F/m = 10 N / 2 kg = 5 m/s²
(c) N (newton) · must show N, newton
Common mistakes: Inverting the formula
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correct formula stated.
M1 (b) · 1 mark · Substitutes values into the formula.
A1 (b) · 1 mark · Correct calculation of acceleration (5 m/s²).
B1 (c) · 1 mark · Correct SI unit for force (newton, N).
Worked solution
a) F = m × a
c) Force SI unit: newton (N)