Forces and motions

Which of the following pictures are non-contact forces!

(The answer is more than one)

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What forces act in the following image?

• Gravitational forces

• Magnetic forces

• Tension forces

• Spring forces

Gravity: an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall. How high you jump will surely fall to earth too.

Can you find the object around us that always have gravitational forces? What is that? Explain it!

Match these activities and the following types of forces!

• 1 = N, 2 = P, and 3 = L

• 1 = N, 2 = O, and 3 = L

• 1 = N, 2 = O, and 3 = O

• 1 = N, 2 = M, and 3 = L

Our parents frequently go to the mechanic to service our car and change its oil. Oil can be able to lubricate the gear and machine. Why would your parents need to get this done?

What would happen if you never lubricating the machine?

• Lubricate can make a machine operate more efficiently and reduce the friction between the gear. So it will move smoothly.

• Lubricate can make a machine operate rougher and increase the friction between the gear. So it will move smoothly.

• Lubricate can make a machine rubs quickly and stick to each other.

• Lubricate can make a machine that doesn't have friction between each other. So our car can run freely.

The following pictures are ways to increase friction.

Why do we have to make objects have high friction? Is it possible if we remove friction from the object?

This boy wants to move the box to his house. However, the box has more friction forces. Therefore, the box can't move smoothly. It's very hard. Can you help him? Move this box to his house.

Mention the various ways to increase friction!

When we hit a moving baseball, it changes . . . .

• Shape

• Start moving

• Slow down and stop

• Direction and position

What happens when you apply force to an object?

• The object will change its position and get broke

• The object remains still in its position

• The object can move, change its position, and can change its shape

• The object gonna get to move faster and slower

Which type of force resists motion?

• Pull

• Push

• Friction

• Air resistance