M2.2 Linear motion using SUVAT equations

Front

What is the symbol for displacement?

Back

s

Front

What does u represent?

Back

Initial velocity

Front

What does v stand for?

Back

Final velocity

Front

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

Back

g

Front

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

Back

20 m s^-1

Answer explanation

Use v² = u² + 2as

Front

When can you use SUVAT equations?

Back

When acceleration is constant

Front

A car passes a lamp post 5 seconds after it passed a bus stop. The car has velocity 7 ms^-1 when it passes the bus stop and velocity 6 ms^-1 when it passes the lamp post. How far apart are the bus stop and the lamp post?

Back

32.5 m

Answer explanation

The car decelerates from 7 m/s to 6 m/s in 5 seconds. The average velocity is (7 + 6) / 2 = 6.5 m/s. Distance = average velocity × time = 6.5 m/s × 5 s = 32.5 m. Thus, the bus stop and lamp post are 32.5 m apart.

Front

The rate at which velocity changes is called acceleration.

Back

True

Front

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?

Back

8 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.

Front

What is the unit of acceleration in the International System of Units (SI)?

Back

m/s²