A resultant force acts on a 4 kg trolley and gives it an acceleration of 2 m·s⁻². Calculate the magnitude of the resultant force.
Answer and explanation
Correct answer: C.
- Step 1: Use Newton's second law: .
- Step 2: N.
Answer
.
Why not the others: : this is the acceleration, not the force. : the mass was multiplied in twice. : mass and acceleration were added.
Practise more Mechanics: forces, energy and momentum.
Free questions with an explanation for every one, and full timed South Africa Matric mock tests.
More Mechanics: forces, energy and momentum questions
- A book rests on a table. Why are the weight of the book and the normal force of the table NOT a Newton's third-law action-reaction pair?
- A passenger lurches forward when a moving bus brakes suddenly. Which law or principle best explains this?
- A skydiver falling through air reaches terminal velocity when
- In which situation is the total linear momentum of a system conserved?
- In an elastic collision between two objects,
- According to the work-energy theorem, the net work done on an object is equal to