Force & Motion

This graph shows the distance traveled by a remote control toy car over time.

If the car continues moving at the same rate, how far will it travel in 2 minutes?

• 10 m

• 60 m

• 120 m

• 200 m

Mrs. Knight drops her briefcase. When the briefcase lands on the floor, what is the reaction force to the action force of the briefcase on the floor?

• the force of the floor on the briefcase

• the attraction of Earth for the briefcase

• the force of air on the sides of the briefcase

• the force of friction between the briefcase and the floor

Ben coasts along a flat road on his bike. If Ben stops pedaling, his bike will eventually stop. If energy is conserved, why does the kinetic energy of the bike NOT stay constant and continue to coast forever?

• Friction causes some energy to be converted to matter.

• Friction causes some energy to be converted to heat.

• The energy is collected by the brake system.

• he energy is cooled by the rolling tires.

Mimi pushes a book from the edge of a table and releases it at Point 1. It slides across the table and stops at Point 2.Mimi pushes a book from the edge of a table and releases it at Point 1. It slides across the table and stops at Point 2.

• The friction force increases between Point 1 and Point 2.

• The friction force decreases momentum between Point 1 and Point 2.

• The force applied from the push decreases between Point 1 and Point 2.

• The pushing force starts at Point 1 and the friction force stops at Point 2.

Two toy cars are traveling on a track.Thirteen minutes after they start, how do the speeds of the cars compare?

• Both cars are traveling at the same speed

• Both cars have stopped moving on the track

• Car 1 is moving faster.

• Car 2 is moving faster

Alesia is taking an all-day ride on her bicycle. The graph shows how far she is from home at different times during her ride.During which time period is Alesia moving fastest?

• 0–1 hours

• 3–4 hours

• 4–5 hours

• 6–7 hours

When a space shuttle orbited Earth and returned home, a force opposed its motion. What was the source of the opposing force?

• friction from the atmosphere

• the velocity of the shuttle

• the mass of the shuttle

• gravity from Earth

Some race cars are equipped with parachutes to help bring the car to a stop.Which MOST likely causes the change in the velocity of the race car?

• a balanced force exerted by the parachute

• an increase in the force exerted by the car

• a net force of zero between the car and parachute

• an unbalanced force between the car and parachute

If a leaf and a dime are dropped from the same height, what force will cause the leaf to fall more slowly?

• frictional force

• centripetal force

• gravitational force

• electromagnetic force

When a skydiver jumps from a plane, the open parachute will increase the air resistance by....

• reducing fluid friction.

• increasing surface area.

• increasing terminal velocity.

• decreasing mass.