11B5 React Quiz P5 mid point test

What is the difference between speed and velocity.

• Speed is a vector, velocity is scalar

• Speed is scalar, velocity is a vector

• Speed is how fast something is, velocity is how quickly it gets to that speed

• Velocity is in all directions at once

Where is the person walking fastest

• A

• B

• C

• D

Why is the person walking fastest at B?

Describe how to find the centre of mass of an irregular object.

• Where the lines cross is the centre of mass

• suspend the card through one of the holes using a pin or nail

• Use a pen to draw a line along the string

• Suspend a weight on a string from the nail

• Repeat this for another hole on the card

What is happening in this graph?​ (a)  

• Travelling at constant velocity
• Travelling at constant acceleration
• Travelling at constant deceleration
• Not moving

What is happening in this graph?​ (a)  

• Travelling at constant velocity
• Travelling at constant acceleration
• Travelling at constant deceleration
• Not moving

At the start of a race a horse accelerates from velocity = 0 m/s to 9 m/s in 4 seconds.

What is the acceleration. Show your working

Mathematical Equivalence

ON

Why does force X act in an upward direction

• Air resistance always goes upwards

• He is falling upwards

• Friction acts in the opposite direction to motion

• It's an interaction pair

At the beginning force Y is bigger than force X. The unbalanced force will make the skydiver ​ (a)   ​ (b)   ​

• accelerate
• downwards
• stop
• decelerate
• upwards
• sideways

The parachute opens. After a while forces and Y are balanced. Force X has

• increased

• stayed the same

• decreased