Gravity and Friction

Quarter 3 - Week 1

Gravity and Friction

By LENNY GILI

​Objective/s:

​1. Define gravity and friction

2. Infer how friction and gravity affect movements of different objects.

Activity 1:

​Identify the following pictures if it show gravity or friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

Multiple Choice

• Gravity

• Friction

​Question/s:

​What is Gravity?

What is Friction?

How does gravity and friction affects the movement of objects around us?​

​Gravity and friction are two kinds of forces

​​Gravity is a force that pulls all objects towards earth or to the ground.

​ Weight - is the measure of the pull of gravity.

- the more mass the object has, the more ​gravity pulls on it.

​

​Gravity and friction are two kinds of forces

​Friction - is a force that resists the movement of an object sliding against another

​ - It happens when two objects rub together causing them to slow down.

​Read the following statements. Answer it with True or False.

​Activity 2:

Multiple Choice

 

Weight is the measure of gravitational force on an object.

• True

• False

Multiple Choice

Forces have strength and direction.

• True

• False

Multiple Choice

You can reduce friction by adding a lubricant.

• True

• False

Multiple Choice

Gravity pulls object upward.

• True

• False

Multiple Choice

The rocky road will decrease the speed of the ball because of friction.

• True

• False

Questions:

Why is it harder to walk on a wet road than on a dry one?

​

Why is it hard to go upstairs than to go downstairs?​

​

​How does gravity and friction affect our daily activities?

What happens when gravity and friction stopped working?

​Activity 3:

​Read the questions carefully. Choose the letter of the correct answer.

Multiple Choice

Lilly has a flat piece of paper and a ball of paper. She drops both papers at the same time from the same height. The ball of paper hits the ground first. Which force acts on the flat piece of paper that slows it down?

• friction

• inertia

• gravity

• magnetism

Multiple Choice

Two people need to move a large, heavy box. One person pushes the box, while the other person pulls the box. Which way of moving the box makes the work easiest for the people?

Multiple Choice

 

Two toy race cars are going to be raced down the same ramp. Which information is most helpful in predicting which car will win the race?

• length of the ramp

• slope of the ramp

• volume of the cars

• mass of the cars

Multiple Choice

A man is pushing a ball up a hill. If the man stops pushing the ball and steps out of the way, what will most likely happen to the ball?

• It will stop on the hill

• It will roll to the side toward the man

• It will roll down the hill.

• It will fly.

Multiple Choice

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease

• The marble would stop immediately.

• The marble’s speed would increase

• The marble would remain at constant speed

Multiple Choice

Why is it important for basketball players to wear shoes with tread when playing?

• to increase the speed of the player

• to increase friction between the floor and the player’s feet

• to decrease the force between the player and the floor

• to decrease the amount of force needed for the player to move

Multiple Choice

 

John stands at the top of a steep hill and pushes a ball over the edge with his foot. Which force causes the ball to continue rolling down the hill?

• mass

• friction

• gravity

• air resistance

Multiple Choice

A ball is kicked and rolls for a long distance across a field. Which eventually causes the ball to slow and stop?

• friction

• motion

• gravity

• position

Multiple Choice

 

Which is a force that keeps Earth in orbit around the Sun?

• Friction

• Magnetism

• Gravity

• Radiation

Multiple Choice

What would happen without gravity?

• Nothing will happen

• Evreything will float away

• Everything will stay on the ground

• Everything will stay on its place.

​

​Task for today:

​

Do learning Task 1 -3 p. ​8-11