4.6D Forces

4.6D Forces

​

Force

A force is a push or a pull that causes an object to stope, move or change direction

Multiple Choice

What is a PUSH or PULL of an object?

• Motion
• Force
• Friction
• Gravity

Multiple Choice

Which type of is represented in the picture?

• a pulling force

• an electrical force

• a pushing force

• a magnetic force

Multiple Choice

When you pick things up, you're _______.

• pushing

• pulling

Multiple Choice

When you close the refrigerator, you're _______.

• pushing

• pulling

Multiple Choice

Which of the following actions requires a push?

• Playing tug-of-war

• Picking a carrot

• Opening a dresser drawer

• Pedaling a bicycle

Friction causes objects to

• Stop

• Slow down

Multiple Choice

Materials with ____ surfaces have less friction. This means that they travel faster.

• smooth

• rough

• both

Multiple Choice

Rougher surfaces have ___ friction. This means that they are more likely to slow down or stop.

• greater

• less

• no

Multiple Choice

The rougher the surface, the faster an object will travel over the surface.

• True

• False

Multiple Choice

Will a toy car slow down quicker on carpet or foil?

• Carpet because it is a rough surface and has more friction.

• Carpet because it is a rough surface and has less friction.

• Foil because it is a smooth surface and has more friction.

• Foil because it is a smooth surface and has less friction.

Multiple Choice

Why does ice have less friction?

• Because it is frozen water.

• Because it is a smooth surface.

• Because it is cold.

• Because it is a rough surface

Open Ended

Imagine you are going down a slide. Would you go down faster if the slide was made of metal or wood? Why?

I would go faster if the slide was ___ because ___.

Open Ended

Students conduct an investigation by rolling a car down a ramp covered with four different surfaces, while measuring the time it takes for the car to travel from the top of the ramp to the bottom of the ramp. The results are shown in the graph.

Which surface causes the LEAST amount of friction?

Multiple Choice

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Multiple Choice

Why is person B having a hard time moving down the hill?

• Person B has more friction than person A.
• Person B has the same friction as person A.
• Person B is out of shape.
• Person B has less friction has person A.

Gravity

The force that makes things fall. It is a pulling force that pulls things towards the center of the earth.

Multiple Choice

A pencil falls to the ground when it is dropped. Which force acts upon the pencil, causing it to fall?

• Friction

• Motion

• Magnetism

• Gravity

Multiple Choice

Which of the following investigations tests the effect of gravity on an object?

• Pulling a wagon through a grassy field

• Rubbing two balloons together

• Dropping a ball from different heights

• Attracting iron filings with a magnet

Multiple Choice

Sally is throwing a ball high into the air and then catching it. What force is responsible for the ball coming back to the ground?

• speed 
• friction
• gravity
• acceleration 

Magnetism

Magnets attract (pull certain metals close) or repel (Push some objects away)

Multiple Choice

Students play with two small, toy plastic dogs with a strip attached to the bottom of them. When placed close together, the dogs will either move quickly towards each other and stick together or will push away from each other. These toys move because of the force of —

• gravity

• friction

• magnetism

• all of the above

Multiple Select

Why is magnetism a force? Hint: Pick the 4 choices that are correct.

• It can push objects away

• It can pull objects close

• It can cause objects to move

• It can cause objects to change direction

• They are strong