Physics obj1-2

Forces and Motion

Let's start off with obj1, Types of Forces!

Multiple Choice

What is a force?

• The speed at which an object moves.

• A source of energy in the universe.

• A push or pull acting on an object.

• The energy of an object.

Multiple Choice

The strength of a force is measured in...

• Newtons

• Joules

• Forces

• Calories

Don't forget about the directions as well!

Multiple Choice

A force of 20 N is acting on a box. What other information is needed to accurately describe this force?

• The mass of the box.

• The direction of the force.

• The motion of the box.

• The duration of the force.

Multiple Choice

A student pushes a box to slide it across the floor. Which statement best explains why the box begins to move?

• The applied force is less than the force of friction.

• The applied force is greater than the force of friction.

• The weight of the box is greater than the force of friction.

• The weight of the box is less than the force of friction.

Multiple Choice

_______ is a force that resists motion between surfaces that are in contact.

• Resistance

• Acceleration

• Friction

• Inertia

Multiple Choice

Which statement about an object in motion is correct?

• An object in motion will remain in motion until it experiences an unbalanced force.

• An object in motion will remain in motion and continue accelerating indefinitely.

• An object in motion will always slow down over time.

• An object in motion will always eventually stop.

Multiple Choice

A ball on a cart is moving at a rate of 2 m/s. The cart suddenly stops, but the ball continues to travel in the same direction at the same speed. This is an example of the...

• first law of motion.

• second law of motion.

• third law of motion.

• law of gravity.

Multiple Choice

An airplane is flying north. What is the direction of the air friction force acting on the plane?

• West.

• East.

• North.

• South.

Multiple Choice

Kim is pushing a box on a flat surface. The box is moving. Which type of force is Kim using to move the box?

• Friction force.

• Applied force.

• Normal force.

• Gravitational force.

Multiple Choice

A toy car starts at the top of a ramp, rolls down, and slows to a stop. Which acts most to bring the car to a stop?

• electrical force

• wind speed

• magnetism

• friction

Objective 2

Balanced and unbalanced force

Multiple Choice

Which of the following is an example of balanced forces?

• A truck beginning to accelerate.

• A basketball being held.

• A door starting to open.

• A book falling off a table.

Multiple Choice

A moving train comes to a stop at the station. What happened to make the train change motion?

• The train does not experience forces acting on it.

• The train would stop with or without forces.

• The train experienced an unbalanced force.

• The train experienced a balanced force.

Multiple Choice

The best example of balanced forces is a

• car increasing speed.

• bus parked in a garage.

• ball kicked along a flat surface.

• roller coaster slowing down on an incline.

Multiple Choice

Two forces act in opposite directions on a woodblock. What will happen if the forces are unbalanced?

• The block will balance the forces.

• The forces will reverse direction.

• The mass of the block will change.

• The position of the block will change.

Multiple Choice

In a lab investigation, a student notes that two metal blocks have the same mass. Based on this observation, if the two blocks were put on opposite sides of a balance, they would best represent

• balanced forces.

• unbalanced forces.

• equal and opposite reactions.

• objects in motion.

Multiple Choice

An example of unbalanced forces in action is:

• a boat floating on still water

• a rising balloon

• a person sitting on a chair

Multiple Choice

In a game of tug-of-war, one student pulls on the rope with a force of 100 N to the right, and another pulls on the rope with a force of 100 N to the left. What is the net force on the rope?

• 200 N to the right.

• 0 N.

• 200 N to the left.

• 100 N to the right.

Multiple Choice

John’s team pulls one end of a rope with 8 Newtons of force. Mike’s team pulls the other end of the rope with 4 Newtons of force. What will happen to the rope?

• The rope will move towards Mike.

• The rope will move towards John.

• Mike’s team will fall backwards.

• The rope will not move due to balanced forces.

Multiple Choice

Two students are pushing a sofa across a room. What is the net force applied to the sofa by the students?

• 400 N

• 250 N

• 200 N

• 150 N

Multiple Choice

One person pulls on a rope with a force of 400 N to the right. Another person pulls on the opposite end of the rope with a force of 600 N to the left. What is the net force on the rope?

• 400 N to the right.

• 1000 N to the left.

• 600 N to the left.

• 200 N to the left.