Net force

A lamp is sitting on a table. What are the forces acting on the lamp?

• Both gravity and the table push up

• Gravity pulls down and the table pushes up

• Gravity pulls down and the lamp pushes up

• Gravity pushes up and the table pushes down

Two students push a piano in the same direction across an ice rink. If student A pushes with a force of 10N and student B pushes with a force of 15N, what is the net force acting on the piano?

• 10N

• 15N

• 20N

• 25N

Two dogs are fighting over a steak. If the chihuahua pulls the steak with a force of 5N, and the bulldog pulls the steak with a force of 20N, what is the net force acting on the steak?

• 5N

• 10N

• 15N

• 20N

Two dogs are fighting over a steak. If the chihuahua pulls the steak with a force of 5N, and the bulldog pulls the steak with a force of 20N, which dog wins the steak?

• Chihuahua

• Bulldog

What is a force?

• A push

• A pull

• A push or pull

• The ability to do work

Two people are pulling on a tug of war rope. Which of these show balanced forces? Check all that apply

• Person A: 20N - Person B: 20N

• Person A: 10N - Person B: 20N

• Person A: 20N - Person B: 25N

• Person A: 10N - Person B: 10N

• Person A: 25N - Person B: 25N

Two people are pulling on a tug of war rope. Which of these show unbalanced forces? Check all that apply

• Person A: 25N - Person B: 10N

• Person A: 20N - Person B: 20N

• Person A: 5N - Person B: 6N

• Person A: 16N - Person B: 16N

• Person A: 25N - Person B: 20N

Three students are pushing a box down the hallway. Student A and B both push the box to the right with a force of 10 N each. Student C pushes the box to the left with a force of 15 N. Which direction does the box move, and with what force?

• Right with a force of 10 N

• Right with a force of 5 N

• Left with a force of 15 N

• Left with a force of 5 N

• The box does not move

Three students are pushing a box down the hallway. Student A and B both push the box to the right with a force of 10 N each. Student C pushes the box to the left with a force of 15 N. If the force of friction is 5 N, which direction does the box move, and with what force?

• Right with a force of 10 N

• Right with a force of 5 N

• Left with a force of 15 N

• Left with a force of 5 N

• The box does not move

2 students are pushing a cart. Student A pushes the cart to the left with a force of 100 N. If the cart is moving to the right with a force of 20 N, how much force is Student B pushing the cart with?

• 80 N

• 100 N

• 120 N

• 0 N