Chapter 1 Forces

Chapter 1 Forces

Open Ended

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

Fill in the Blank

The force of gravity of the Earth onto us is called our ______.

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

Fill in the Blank

What is the unit for weight?

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 Blank

A skydiver is freefalling. What is the name of force A?

Fill in the Blank

A skydiver is freefalling. What is the name of force B?

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?

Fill in the Blank

Which would experience more air resistance - a streamlined car travelling slowly or a lorry travelling fast? Explain your answer

Open Ended

What causes air resistance?

Fill in the Blank

When objects are freefalling in air, they will speed up and eventually reach a constant speed. The constant speed is called _________________________.

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 Blank

The block weighs 3 N. If the block is not moving, what is the size of the tension force in the string?

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 Blank

What is the extension of the spring when there is a 5N load onto the spring?

Fill in the Blank

What is the extension of the spring when there is a 10N load onto the spring?

Fill in the Blank

What is the total length of the spring when a 10N load is added to the spring?

Fill in the Blank

When something is floating in water or air, what is the name of the force that pushes it up?

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​

Fill in the Blank

When a rope or spring is stretched, what is the name of the force within the rope or string?

Fill in the Blank

A spring is 3cm long. A student hangs a weight of 2N on it. It is now 4.5cm long.

What is the extension?

Fill in the Blank

A spring is 3cm long. A student hangs a weight of 2N on it. It is now 4.5cm long.

What would be the extension with a weight of 4N?

Fill in the Blank

A spring is 3cm long. A student hangs a weight of 2N on it. It is now 4.5cm long.

What would be the length of the spring with a weight of 6N?

Fill in the Blank

A floating boat weighs 20 000 N. What is the size of the upthrust?

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?

Fill in the Blank

Name one factor which affects air/water resistance

Fill in the Blank

What shape do we call the shape of the body of the dolphin?

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?

Fill in the Blank

Which variable is being changed 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​

Fill in the Blank

Before starting an experiment, what must you do first?

Fill in the Blank

What do we call something that we can change in an experiment?

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​

Fill in the Blank

What do we call variables which can take any value?

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

Fill in the Blank

Sometimes, when we make measurements, one or more readings are far from the line of best fit. That point is called the ______________________.

Open Ended

Why do you think there may have been anomalous points?