M2.2 Linear motion using SUVAT equations

Which of the following is a unit of displacement?

• kg

• m/s²

• m

• m/s

A freely falling object on Earth has a speed of 5.0 m s^-1. After falling a further 20 m, its speed it

• 15 m s^-1

• 20 m s^-1

• 25 m s^-1

• 45 m s^-1

Answer explanation

Use v² = u² + 2as

When can you use SUVAT equations?

• When acceleration is constant

• When acceleration is variable

• Any time when you are treating an object as a particle

Which of the following is a unit of velocity?

• m/s

• m/s²

• m

• kg

If a car accelerates uniformly from rest to a speed of 20 m/s in 10 seconds, what is its acceleration?

• 4 m/s²

• 2 m/s²

• 1 m/s²

• 3 m/s²

Answer explanation

To find acceleration, use the formula: acceleration = (final speed - initial speed) / time. Here, acceleration = (20 m/s - 0 m/s) / 10 s = 2 m/s². Thus, the correct answer is 2 m/s².

An object  accelerates at 2  m/s². Assuming the object starts from rest, how much time does it need to accelerate to a speed of 16  m/s?

• 4 s

• 8 s

• 16 s

• 1/16 s

Answer explanation

To find the time, use the formula: final speed = initial speed + (acceleration × time). Here, 16 m/s = 0 + (2 m/s² × time). Solving for time gives time = 16 m/s ÷ 2 m/s² = 8 s. Thus, the correct answer is 8 s.

If an object is moving with a constant velocity, what is its acceleration?

• Variable

• 10 m/s²

• 1 m/s²

• 0 m/s²

What is the symbol for acceleration of free fall at the Earth's surface?

• a

• f

• g

• v

What does v stand for?

• Final velocity

• Initial velocity

• Average velocity

• Terminal velocity

Which of the following quantities is scalar?

• Acceleration

• Speed

• Velocity

• Displacement