1.4.1 Unbalanced Forces and Motion - Reading Check (Savvas)

What is required to change the motion of an object according to the passage?

• A force

• Inertia

• Friction

• Gravity

What is inertia as defined in the passage?

• Resistance to any change in velocity

• A force that moves objects

• The energy required to move an object

• The speed of an object

What happens to a hockey puck at rest if no force is applied, according to the passage?

• It remains at rest

• It starts moving

• It accelerates

• It changes direction

According to the passage, what is the role of friction when moving a piano across a room?

• It stops the piano

• It increases the piano's speed

• It reduces the piano's inertia

• It changes the piano's direction

What is an example of an unbalanced force mentioned in the passage?

• Gravity

• Friction

• Inertia

• Balanced forces

What must be true for forces to be considered balanced, as described in the passage?

• They must be equal in magnitude and opposite in direction

• They must be greater than the object's inertia

• They must be applied continuously

• They must be greater than the force of gravity

What happens to a tennis ball when it is dropped, according to the passage?

• It falls due to gravity

• It remains in the hand

• It moves upward

• It stays suspended in air

You read in paragraphs 2 and 3 that changing an object’s motion requires force. In the game of curling, one player slides a heavy stone about 45 meters across ice. To lengthen its slide, other players sweep the ice ahead of the stone. How does the sweeping affect the movement of the stone?

• The sweeping increases friction to increase the speed of the stone.

• The sweeping decreases friction to increase the speed of the stone.

• The sweeping increases friction to decrease the stone’s rate of deceleration.

• The sweeping decreases friction to decrease the stone’s rate of deceleration.

You read in paragraphs 5–6 that inertia is a property of moving bodies as well as stationary bodies. Which two characteristics of a body affect its inertia?

• mass

• volume

• speed

• density

Tomás and his younger sister Gwen are finishing work on a wood sculpture. A friend is helping them attach the sculpture to its base. Tomás and Gwen standon either side of the sculpture and push on it. They hold it still until their friend finishes attaching the base. Which statement about the forces in this situation is correct?

• he forces exerted by Tomás and Gwen are balanced because the sculpture will fall over without a base

• The forces exerted by Tomás and Gwen are balanced because the sculpture remains still.

• The forces exerted by Tomás and Gwen are unbalanced because the siblings are not the same age.

• The forces exerted by Tomás and Gwen are unbalanced because the sculpture cannot stand on its own