Chapter 1 Forces

Chapter 1 Forces

Open Ended

What do you think affects how strong is the gravity between two objects?

Open Ended

If my mass is 56 kg, and the gravitational field strength on Earth is 9.8N/kg, how much would I weigh on Earth?

Question Time

Get ready.

Multiple Choice

In which direction is the gravity from the Earth pulling onto the person?

• A

• B

• C

• D

Multiple Select

If you are standing on Earth, how is gravity working?

• You are pulling the Earth

• You are pushing the Earth

• The Earth is pulling you

• The Earth is pushing you

Multiple Choice

Our mass is determined by

• how strong is the Earth's gravitational force on us

• how tall we are

• how much matter do we contain

• how far we are from Earth

• All of the above

Multiple Choice

The gravitational field strength on Mars is weaker than that on Earth. Our weight on Mars would be _________ our weight on Earth. Our mass on Mars would be ____________ our mass on Earth

• the same as, the same as

• less than, less than

• less than, the same as

• the same as, less than

Open Ended

What do you feel in your face when you are running/riding a bicycle quickly/on a roller-coaster?

Poll

Two people are running, one is running faster than the other. They are the same height and same body shape. Which person experiences more air resistance?

• The faster person

• The slower person

• The same

Open Ended

Two pieces of metal of the same type and same mass are dropped from the same height and same place.

Which one will fall faster? Why?

Poll

Which car here do you think will experience more air resistance?

• The top car

• The bottom car

• The same

Open Ended

When do you think is increasing air resistance important?

Fill in the Blanks

Fill in the Blanks

Multiple Choice

When there is air, which object fell faster?

• Feather

• Bowling ball

• They both fell at the same rate

Multiple Choice

When there is no air, which object fell faster?

• Feather

• Bowling ball

• They both fell at the same rate

Question Time

Get ready

Open Ended

Car manufacturers put cars in wind tunnels to help them design streamlined cars.

How are streamlined cars better?

Open Ended

What causes air resistance?

Open Ended

Fill in the blanks below using either the word "balanced" or "unbalanced".

When a skydiver jumps out of the plane, the forces are __________.

When she reaches a steady speed of 50 m/s, the forces are _______.

The parachute then opens and this makes the forces ___________.

She then reaches a lower terminal velocity of 5m/s. The forces are now ______________.

Finally, she lands and stands on the ground. The forces are _______.

Open Ended

A cricket ball is heavier than a tennis ball. Explain why a tennis ball and a cricket ball dropped together will hit the ground at the same time.

Multiple Choice

A wooden block is tied by a string to the ceiling. Which direction is the tension force acting on the block?

• A

• B

• C

• D

Fill in the Blanks

Open Ended

Think of one elastic object and one plastic object.

Open Ended

If we pull on a spring with a larger force, what will happen to the spring?

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Poll

Let’s say you are lifting a 100 kg block underwater in a swimming pool. Is it easier, harder, or the same when compared to lifting the same block on land?

• Easier underwater

• Harder underwater

• They are the same

​Question Time

Get ready​

Open Ended

Explain what is the elastic limit of a spring.

Open Ended

When people do a bungee jump, they are asked how much they weigh. Why?

Open Ended

Before doing an experiment, we need to know what question do we want to solve.

What do you think is the question that we are trying to solve?

Open Ended

What can you change in this experiment?

Poll

There are 5 solids, all made with the same mass of clay. Which one do you think will fall the fastest in water?

• Cone

• Cube

• Sphere

• Cylinder

• Flat disc

Poll

There are 5 solids, all made with the same mass of clay. Which one do you think will fall the slowest in water?

• Cone

• Cube

• Sphere

• Cylinder

• Flat disc

Open Ended

What equipment do you think you need?

Question Time​

Get ready​

Open Ended

Why must we only change one variable at a time in an experiment?

Open Ended

What is wrong with the table here?

Open Ended

What do you think trampolines need in order for them to work?

Open Ended

We will load different masses onto the spring. We will then calculate the extension of the spring.

In the table for our results, what should we write in the column on the left and on the right?

Question Time​

Get Ready​

Multiple Choice

When the variables of an experiment are both continuous variables, which type of graph is best to visualize our data?

• Pictogram

• Bar chart

• Histogram

• Line graph

• All of the above

Multiple Select

Which of the following is/are not true for the line of best fit?

• Must pass through all points

• Must use a ruler to draw

• Shows us trends or patterns in our resutls

• Can be curved or straight

Open Ended

Why do you think there may have been anomalous points?