Forces in Motion

If a car is moving a 65 mile per hour (constant speed), what will happen to the motion of the car if no new force is applied?

• The car will speed up.

• The car will slow down.

• The car will stay at 65 mph.

• The car will stop.

Answer explanation

An object in motion will stay in motion unless acted upon by an outside force. INERTIA

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What will happen when these magnets are brought close together?

• They will attract each other.

• They will repel each other.

• Both magnets will turn to the left

• Both magnets will turn to the right

Answer explanation

Opposites attract (North and south or positive and negative.)

Likes repel (North and north or south and south. The same for two positives or two negatives.)

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Where are the magnetic force the strongest in this picture?

• Location 1

• Location 2

• Location 3

• Location 4

Answer explanation

Always strongest at the poles.

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The strength of a magnet can be changed by

• adding less loops to the coil.

• adding more loops to the coil.

Answer explanation

You can make the electromagnet more powerful by adding loops or volts.

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A student makes an electromagnet as shown above and finds that it is only strong enough to pick up one paper clip. What modification will she need to do in order to make it pick up three paper clips?

• wrap more coils around the nail

• use staples instead of paper clips

• replace the battery with a bar magnet

• use paper clips made of aluminum

Answer explanation

You can make the electromagnet more powerful by adding loops or volts.

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How does distance effect the magnetic field?

• It gets stronger the farther you get from the magnet.

• It gets weaker the farther you get from the magnet.

• Distance does not effect the strength of the magnetic field.

• It depends on the type of magnet.

Answer explanation

Just like gravitational and electrical fields. The father away they are, the weaker the force.

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Which is not an example of acceleration?

• Driving at a constant speed

• A bat hitting a ball

• Throwing a football

• Kicking a soccer ball

Answer explanation

Acceleration means slowing down, speeding up, or changing direction.

Acceleration is

• a change in direction

• a change in speed

• a change in direction and speed

• All of the above

Answer explanation

Acceleration means slowing down, speeding up, or changing direction.

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes

• It doesn't

• It slows down

• Its speeds up

Answer explanation

Acceleration means slowing down, speeding up, or changing direction.

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In each of the following cases, determine where the car has no acceleration ?

• A car shortly after a stoplight turns green.

• A car approaching a red light

• A car with the cruise control set at 80 km/h

• A car turning a curve at a constant speed

Answer explanation

Acceleration means slowing down, speeding up, or changing direction. The cruise control implies same direction and speed.

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