Forces Almost There

A train is moving at a constant speed along a straight track. Which of the following is true about the forces acting on the train?

• The net force is zero.

• There is a net force in the direction of motion.

• The net force is equal to the train’s weight.

• The frictional force is greater than the engine's force.

Tags

NGSS.HS-PS2-1

A book rests on a table. Which of the following pairs of forces are action-reaction pairs according to Newton’s Third Law?

• The weight of the book and the normal force of the table on the book.

• The gravitational force on the book and the force of the book on the table.

• The force of the book on the table and the force of the table on the book.

• The normal force on the book and the gravitational force on the table.

A spacecraft is moving in deep space where no gravitational forces are acting on it. What will happen to its motion if no forces act on it?

• It will slow down gradually.

• It will speed up.

• It will continue moving at the same speed.

• It will stop eventually.

Tags

NGSS.HS-PS2-2

A skier is sliding down a snow-covered hill. Which of the following is the reaction force to the skier’s weight?

• The force of friction acting on the skier

• The normal force acting on the skier

• The skier pushing on the ground

• The force of gravity from the skier on the earth.

Tags

NGSS.MS-PS2-4

Two hockey players collide during a game. If player A exerts a force of 500 N on player B, how much force does player B exert on player A?

• 250 N

• 500 N

• 1000 N

• 0 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

A soccer ball is kicked, flies through the air, and then lands on the ground. When does the ball experience zero net force?

• While it is being kicked

• When it is in the air

• Just as it hits the ground

• Never

Tags

NGSS.MS-PS2-2

A 60 kg astronaut floats in space. Which of the following forces keeps the astronaut floating?

• The astronaut’s inertia

• The normal force

• The gravitational force

• There is no net force acting on the astronaut.

Tags

NGSS.MS-PS2-5

A person throws a ball straight upward. At the highest point of its motion, the ball’s velocity is:

• Positive and increasing

• Zero

• Negative and increasing

• Constant

Tags

NGSS.MS-PS2-4

A 5 kg box is pushed across a frictionless surface with a force of 15 N. What is the box’s acceleration?

• 1 m/s²

• 3 m/s²

• 5 m/s²

• 15 m/s²

Tags

NGSS.MS-PS2-2

A bicycle rider exerts a force of 50 N to overcome air resistance and maintain a constant speed. What is the net force acting on the rider?

• 50 N

• 25 N

• 0 N

• 100 N

Tags

NGSS.MS-PS2-2