113-1 Core Physics

Chapter 1

100

What is the equation for density?

- write it in symbol & word

density = mass / volume

p=m/v

200

What are two instruments needed to measure density? 

balance (electric balance) 

measuring cylinder (filled with water)

300

How would you find the volume of an 'irregular' object? 

Place the object in a measuring cylinder that is filled with water. Record the difference of water level and that will be its volume. 

400

A metal object is weighed and has a mass of 62 grams. Its volume is 29 cm³. Calculate its density 

Would the object float or sink?

p=m/v 

p=62g/29cm³

p=2.14 g/cm³

This metal object would sink. 

500

This object is known to have the density of 0.72 g/cm³. It weighs as 12.6g. Calculate its volume. 

p=m/v 

v=m/p 

v=12.6g/0.72g/cm³

v= 17.5 cm³

Chapter 2

100

What is the equation for speed? 

- write in symbol and word

speed = distance / time 

v=d/t

200

What are two instruments needed to calculate speed?

timer (stop watch) 

ruler (measuring tape)

300

What are two different common units of speed? 

m/s and km/h

400

A runner runs a 200m race. 

He clocks at 25.12 seconds. 

What is his average speed?

v=d/t 

v= 200m/25.12s 

v=7.96 m/s

500

Create a speed-time graph of: 

0s = 0m/s 

30s = 7 m/s 

40 s = 7 m/s 

50 s = 7 m/s 

60s = 0ms 

Calculate its total distance travelled. 

create an accurate graph 

area of triangle + area of rectangle = distance travelled. 

Distance travelled = 280m

Chapter 3

100

What is the equation of gravitational field strength? 

- write in word & symbol

gravitational field strength = weight / mass 

g = W/m

200

What is g on Earth? 

g = 9.81 N/Kg

300

If g on Planet A is 12.1 N/Kg and the mass of a watermelon is 981 g, what is it's weight? 

g = W/m 

W = g x m 

12.1 N/Kg x 0.981 Kg = 11.87 N

400

A driver pushes the petal and moves ahead. Its forward push is 1,200 N and is pushed back from air resistance of 225 N. 

Draw a force diagram and calculate its resultant force

225 N <-- Car --> 1200N 

R_{F =} 1200 N - 225 N  

R_F = 975 N

500

A ball on Earth has W = 112N. On Planet A, its W = 82N. 

Find out what the gravity on Planet A is? 

Earth: 

W = 112 N; g = 9.81 N/Kg 

g = W/m ; m = W/g

m = 112N / 9.81 N/Kg 

m =11.4 Kg 

Planet A: 

W = 82N & m = 11.4 Kg 

g = W/M --> 82N/11.4Kg 

g = 7.19 N/Kg