Yr7 Air-resistance and force diagrams quiz

What happens to the speed of a falling object as air resistance increases?

• The speed increases.

• The speed decreases.

• The speed remains constant.

• The object changes direction.

Answer explanation

As air resistance increases, it acts against the falling object's motion, causing the speed to decrease due to the opposing force.

Tags

NGSS.MS-PS3-5

In a force diagram, what does an arrow pointing downwards usually represent?

• Air resistance

• Friction

• Gravity

• Thrust

Answer explanation

In a force diagram, an arrow pointing downwards usually represents gravity, which is the force pulling objects towards the center of the Earth.

Tags

NGSS.MS-PS2-4

Which of the following scenarios describes balanced forces?

• A car accelerating down a road.

• A book resting on a table.

• A ball falling through the air.

• A rocket launching into space.

Answer explanation

The scenario that describes balanced forces is a book resting on a table because the forces acting on the book are equal and opposite, resulting in no net force.

What type of force is friction in a force diagram?

• A force that always acts upward.

• A force that acts in the direction of motion.

• A force that opposes motion.

• A force that increases speed.

Answer explanation

Friction is a force that opposes motion, acting in the direction opposite to the motion of an object.

How does air resistance affect the acceleration of a falling object?

• It increases acceleration.

• It decreases acceleration.

• It does not affect acceleration.

• It reverses acceleration.

Answer explanation

Air resistance decreases acceleration by opposing the motion of the falling object, resulting in a slower rate of acceleration.

What does a larger arrow in a force diagram indicate compared to a smaller arrow?

• Less force

• More force

• The same amount of force

• Direction of force only

Answer explanation

More force

In a force diagram showing a car slowing down, which force is likely represented by an arrow pointing to the left?

• Gravity

• Thrust

• Friction

• Air resistance

Answer explanation

In a force diagram showing a car slowing down, the force likely represented by an arrow pointing to the left is Friction, as it acts opposite to the direction of motion to slow the car down.

Tags

NGSS.MS-PS2-2

What does it mean if the forces on an object are unbalanced?

• The object is at rest.

• The object moves at a constant speed.

• The object changes its state of motion.

• The object does not exist.

Answer explanation

If the forces on an object are unbalanced, it means the object changes its state of motion.

Tags

NGSS.MS-PS2-2

Which force is responsible for slowing down a bicycle as it moves forward?

• Thrust

• Lift

• Friction

• Gravity

Answer explanation

Friction is responsible for slowing down a bicycle as it moves forward by opposing the motion between the tires and the ground.

What is the role of air resistance in the motion of a parachute?

• It speeds up the descent.

• It has no effect.

• It slows down the descent.

• It changes the direction of descent.

Answer explanation

Air resistance slows down the descent of a parachute by creating drag force against the motion of the parachute.

Tags

NGSS.MS-PS3-5