Force, mass and acceleration (a = (v – u)/t) | Starter Quiz | Oak National Academy

Which of the following scientists developed three laws of motion?

• Albert Einstein

• Galileo Galilei

• Isaac Newton

• Georg Ohm

• Michael Faraday

Answer explanation

The three laws of motion were developed by Isacc Newton. There were so useful that the unit for force, the newton, is named after him.

Which of the following forces opposes the movement of one solid object across the surface of another?

• drag

• gravity

• upthrust

• magnetism

• friction

Answer explanation

Friction opposes movement of solids across each other. Drag opposes the movement in a fluid (gas or liquid).

Which of the following is the correct relationship between acceleration, change in velocity and time?

• acceleration = change in velocity × time

• acceleration = time ÷ change in velocity

• acceleration = change in velocity ÷ time

Answer explanation

Acceleration is the rate of change of velocity and so the correct relationship is acceleration = change in velocity ÷ time.

A sledge is pulled horizontally across flat ice with a rope. The force of the rope on the sledge is 400 N and a frictional force of 100 N opposes its motion. What is the resultant force on the sledge?

Answer explanation

The resultant force is 400 N – 100 N = 300 N.

Which of the following is the correct unit of acceleration?

• metres per second squared

• metres per second

• metre seconds

• meter seconds squared

A scooter accelerates from rest to 18 m/s in 12 s. Calculate the acceleration of the scooter.