Motion

Question 1

State the units of the following terms

Answer 1

Distance
Time
Speed
Rate of change of speed

Question 2

Two equations for average speed

Answer 2

(Initial speed + final speed). Total distance ➗ total time
————————————-
2.

Question 3

Equation for rate of change of speed

Answer 3

Change in speed ➗ time

Question 4

How would you calculate average speed from a distance time graph

Answer 4

Find gradient

Question 5

What’s the difference between a scaler and a vector

Answer 5

Scalar only includes magnitude whereas vectors use direction and magnitude

Question 6

Name 3 scalar quantities

Answer 6

Speed distance and mass

Question 7

State 3 vector quantities

Answer 7

Velocity displacement and acceleration

Question 8

Equation used to calculate acceleration

Answer 8

Change in velocity ➗ time. U-V ➗ time

Question 9

What terms can be used to describe negative acceleration

Answer 9

Deceleration and retardation

Question 10

In a distance time graph what does the gradient represent

Answer 10

Speed

Question 11

In a speed time graph what does the gradient represent

Answer 11

Acceleration

Question 12

In a speed time graph what does the area under the graph represent

Answer 12

Distance traveled.

Question 13

In a displacement time graph what does the gradient represent

Answer 13

Velocity

Question 14

In a velocity time graph what does the the gradient represent

Answer 14

Acceleration

Question 15

In a velocity time graph what does the area under the graph represent

Answer 15

Displacement

Question 16

What is friction

Answer 16

Friction is the force that acts when one surface slides over another. It always opposes the motion- this means that if an object is trying to slide to the left, friction will always act to the right and so on. Friction converts kinetic energy into heat.

Question 17

What is Newtons 1st law

Answer 17

In the absence of a resultant force an object will remain at rest or continue to move at a constant velocity I.e balanced forces do not produce acceleration.

Question 18

What is Newtons 2nd law

Answer 18

The acceleration is directly proportional to the resultant force acting on it and inversely proportional to the mass of the object.

Question 19

What is newtons 3rd law

Answer 19

If body A exerts a force on body B, there is an equal an opposite force exerted in A by B

Question 20

Equations for newtons 2nd law

Answer 20

F ∝ a
A ∝ 1/m. ∝= directly proportional

Question 21

Define a newton

Answer 21

A force equal to one newton will accelerate 1kg at 1m/s squared

Question 22

Equation of force

Answer 22

F=ma

Question 23

What rate of retardation will objects experience if fired directly upward?

Answer 23

10m/s squared

Question 24

How to measure the acceleration of free fall (gravity)

Answer 24

Measure height ball is dropped from
Drop ball from a rest
Time how long it takes to reach ground
Repeat two more times ignoring anomalies to find average
Calculate results by using final velocity =2x average velocity then do acceleration = final velocity- initial velocity divided by time