S8P3B

A calico cat is asleep in a box. Earth's gravity is pulling down on the cat with a force of 40 N. The bottom of the box is pushing up on the cat with a force of 40 N. Based on only the forces described, which statement describes the forces on the cat?

• The forces are balanced, so there is no net force on the cat.

• The forces are balanced, so there is a net force on the cat.

• The forces are unbalanced, so there is no net force on the cat.

• The forces are unbalanced, so there is a net force on the cat.

Tags

NGSS.HS-PS2-1

Julie is walking her dog. A squirrel just ran by, and Scout is pulling forward on the leash with a force of 250 N. Julie is pulling backward on the leash with a force of 180 N. Based on only the forces described, which statement describes the forces on the leash?

• The forces are balanced, so there is no net force on the leash.

• The forces are balanced, so there is a net force on the leash.

• The forces are unbalanced, so there is no net force on the leash.

• The forces are unbalanced, so there is a net force on the leash.

Tags

NGSS.HS-PS2-1

Irene and Joel are trying to open their garage door because the remote is broken. Irene is pulling up on the garage door with a force of 320 N. Joel is pulling up on the garage door with a force of 300 N. Earth's gravity is pulling down on the garage door with a force of 600 N. Based on only the forces described, which statement describes the forces on the garage door?

• The forces are balanced, so there is no net force on the garage door.

• The forces are balanced, so there is a net force on the garage door.

• The forces are unbalanced, so there is no net force on the garage door.

• The forces are unbalanced, so there is a net force on the garage door.

Tags

NGSS.HS-PS2-1

Carson and Robert are pushing their kayak across the grass toward a lake. Carson is pushing the kayak forward with a force of 400 N. Robert is pushing the kayak forward with a force of 300 N. The grass is pushing the kayak backward with a force of 600 N. Based on only the forces described, which statement describes the forces on the kayak?

• The forces are balanced, so there is no net force on the kayak.

• The forces are balanced, so there is a net force on the kayak.

• The forces are unbalanced, so there is no net force on the kayak.

• The forces are unbalanced, so there is a net force on the kayak.

Tags

NGSS.MS-PS2-2

Malia is sliding a heavy dresser across the carpeted floor of her apartment. She is pushing the dresser forward with a force of 350 N. The carpet is pushing the dresser backward with a force of 380 N. Based on only the forces described, which statement describes the forces on the dresser?

• The forces are balanced, so there is no net force on the dresser.

• The forces are balanced, so there is a net force on the dresser.

• The forces are unbalanced, so there is no net force on the dresser.

• The forces are unbalanced, so there is a net force on the dresser.

Tags

NGSS.MS-PS2-2

People are riding buses to work in the morning. The buses are all the same, but they are carrying different numbers of people. The buses are going the same speed, and each bus is one block away from its next stop. Based on the chart, order the buses from least to greatest to show the size of the force applied to each bus.

• B43, M2, CT5, X9, SL1

• SL1, X9, CT5, M2, B43

• B43, CT5, M2, SL1, X9

• X9, SL1, M2, CT5, B43

Tags

NGSS.MS-PS2-2

S8P3c ~ Identical train engines pull trains on different lines. The number of cars each engine pulls depends on the line. Each train has the same acceleration as it begins to move. Based on the chart, order the trains from least to greatest to show the size of the force applied to each train.

• commuter, holiday, midday, late night, weekend

• weekend, late night, midday, holiday, commuter

• holiday, commuter, weekend, midday, late night

• late night, midday, weekend, commuter, holiday

Tags

NGSS.MS-PS2-2

S8P3c ~ Horses are walking side by side while each pulls a cart from the field to the barn. The carts are identical, but each has a different load of objects. It starts to rain, and the horses speed up. Each horse pulls with the same force to get back to the barn quickly. Based on the chart, order the loads from greatest to least to show the size of the acceleration each cart will have.

• bundle of wheat, large stone, bag of soil, sack of compost

• sack of compost, bag of soil, large stone, bundle of wheat

• bag of soil, bundle of wheat, large stone, sack of compost

• sack of compost, large stone, bundle of wheat, bag of soil

Tags

NGSS.MS-PS2-2

A 5 kg object is at rest on a horizontal surface. A force of 20 N is applied to the object. If the frictional force opposing the motion is 5 N, what is the net force acting on the object?

• A) 5 N

• B) 15 N

• C) 20 N

• D) 25 N

Tags

NGSS.MS-PS2-2

A car is moving with a constant velocity of 60 km/h. What can be said about the net force acting on the car?

• A) The net force is zero.

• B) The net force is 60 N.

• C) The net force is equal to the weight of the car.

• D) The net force is equal to the frictional force.