Motion

Question 1

What is the the formula for average speed? And what’s is speeds units?

Answer 1

Distance travelled divided by total time taken measured in meters per second or ms^-1

Question 2

Define instantaneous speed.

Answer 2

Instantaneous Speed is the speed of a car taken at a very small time interval and can be calculated by getting the tangent to a line on a distance time graph.

Question 3

Describe the difference between velocity and speed.

Answer 3

Velocity is a vector quantity as it is in a certain direction and uses displacement instead of distance

Question 4

Formula for acceleration

Answer 4

Change in velocity divided by change in time or ms^-2

Minus the initial velocity from the final velocity and divide that value by the time taken

Question 5

What is the area under a velocity time graph show?

Answer 5

Displacement

Question 6

What do the letters of suvat stand for?

Answer 6

S-Displacement 
U-initial velocity
V-Final Velocity
A-Acceleration 
T-Time taken

Question 7

What are the components of a stopping distance and define what they mean?

Answer 7

Thinking Distance- Is the distance between seeing the reason to stop and the moment the driver presses on the brakes
Braking Distance- is the distance travelled after the brakes have been applied till when the cars comes to a stop.

Question 8

How do you calculate Thinking Distance?

Answer 8

Speed x Reaction time

Question 9

Acceleration Due to Gravitys value?

Answer 9

9.81ms^-2

Question 10

Think of a way to calculate gravity?

Answer 10

An electromagnet holds a small steel ball above a trapdoor. When the current is switched off, a timer is triggered, the electromagnet demagnetises, and the ball falls. When it hits the trap door it triggers the timer to stop

Question 11

Talk about projectile motion

Answer 11

The vertical velocity is affected by gravity. Then with this value calculate the time it is in the air and then calculate the vertical distance using speed = distance over time