Unit 2 Forces and Motion in Systems Test Review Option Two

A marble rolls along a track and eventually drops into a shallow cup. If friction and air resistance are not considered, when does the ball experience balanced forces during route?

• Locations 1, 6, and 8

• Locations 2, 5, and 7

• Locations 3, 4, and 6

• Locations 1, 4, and 8

When a soccer ball with a mass of 0.43 kg is kicked by a player, the ball can accelerate 25 m/s2 off the player's foot. If resisting forces are ignored, such as friction and air resistance, how many Newtons of force did the player use when kicking the ball?

• 10.75 N

• .0172 N

• 58.1 N

• 200 N

A toddler uses 3 N of force to lift a 1.5 kg wooden block off the floor. What is the acceleration of the wooden black?

• 100 m/s

• 4.5 m/s²

• 2 m/s

• 2 m/s²

The diagram shows two men pushing a stalled car on a level road. What would happen if a third man also pushed the car and supplied an additional 420 N of force?

• The car would move at a constant speed

• The car would increase in speed

• The car would decrease in speed

• The car's motion would be unaffected

A water slide is shown below with locations identified on the rider's path. the speed of an average ten- year old is recorded in the table. Which statement best describes the person's movement on the waterslide?

• the speed at locations A and E are the same because of unbalanced forces

• the speed decreases between locations D and E because of balanced forces

• the speed increases between locations B and C because of unbalanced forces

• the speed decreases between locations B and D because of balanced forces

In an experiment, students measured the amount of force applied to different objects and the amount of acceleration resulting from the applied force. The students recorded their data in the table below. The teacher then asked the students to calculate the mass of each object used in the experiment. Which table identifies the correct mass for each object used in the experiment?

• 
• 
• 
• 

A classroom table has a mass of 24 kg. Pulling with a force of 36 N, a student moves the table to the other side of the classroom. How much did the table accelerate?

• 864 N

• 1.5m/s²

• 1.5 m/s

• .666m/s²

Removing a table cloth from a table set with dishes is a common trick. If performed correctly, the dishes remain on the table after the table cloth has been pulled from the table. While some people claim it is "magic," the actions can be explained by Newton's Laws of Motion. Which statement best explains why the dishes remain on the table after the table cloth is removed?

• the unbalanced force applied to the table cloth is stronger than the force of gravity, so the dishes stay on the table

• the frictional force of the table holds the dishes in place while the table cloth is being removed

• the inertia of the dishes causes them to remain at rest, even though the table cloth is moving

• the acceleration of the table cloth is equal and opposite to the mass of the dishes

A boy applies a force to accelerate a grocery cart across the level floor. How will the acceleration of the cart be affected if the boy applies twice as much force?

• the acceleration of the cart will decrease

• the acceleration of the cart will increase

• the acceleration of the cart will be the same

• the acceleration of the cart will be zero

During a spacewalk, safety equipment worn by astronauts is used to assist the astronaut in navigating back to the spacecraft in case of an emergency. The equipment contains thrusters that expel nitrogen gas a specific direction, allowing the astronaut to move through the vacuum of space. Based on Newton's 3^rd Law of Motion which thrusters should be used if the astronaut wants to move in the direction of the arrow?

• Thrusters 1 and 2

• Thrusters 3 and 4

• Thrusters 5 and 6

• Thrusters 7 and 8