Exploring Surface Forces with Newton's Laws

The video tutorial explains how to solve a problem involving surface forces on a sled. It begins with an introduction to the problem, followed by creating a free body diagram to identify the forces acting on the sled. The tutorial then calculates the weight and normal forces, determines the kinetic friction and tension forces, and finally uses the Pythagorean theorem to find the magnitude of the surface forces exerted by the ground on the sled.

What is the tension in the rope pulling the sled?

• 9.81 Newtons

• 8.8 Newtons

• 12.5 Newtons

• 4.5 Newtons

Tags

NGSS.MS-PS2-2

Which force is responsible for pulling the sled to the right?

• Kinetic friction

• Normal force

• Weight force

• Tension force

What force opposes the tension force to keep the sled moving at constant velocity?

• Static friction

• Kinetic friction

• Normal force

• Weight force

What is the direction of the weight force acting on the sled?

• Leftward

• Downward

• Upward

• Rightward

Tags

NGSS.MS-PS2-4

Which force balances the weight force to prevent vertical movement of the sled?

• Air resistance

• Tension force

• Kinetic friction

• Normal force

What is the formula to calculate the weight force?

• mass × velocity

• mass × acceleration

• mass × gravitational acceleration

• mass × tension

Tags

NGSS.MS-PS2-4

What is the magnitude of the weight force if the mass of the sled is 4.5 kg?

• 4.5 Newtons

• 9.81 Newtons

• 8.8 Newtons

• 44.15 Newtons

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What is the magnitude of the normal force acting on the sled?

• 8.8 Newtons

• 44.15 Newtons

• 9.81 Newtons

• 4.5 Newtons

Tags

NGSS.MS-PS2-2

What is the magnitude of the kinetic friction force acting on the sled?

• 8.8 Newtons

• 44.15 Newtons

• 9.81 Newtons

• 4.5 Newtons

What is the final magnitude of the surface forces exerted by the ground on the sled?

• 45.02 Newtons

• 9.81 Newtons

• 44.15 Newtons

• 8.8 Newtons

Tags

NGSS.MS-PS2-2