Category 2 Reteach

What is the best description of the forces acting on the cylinder? Explain your answer.

Which statement accurately reflects the relationship between speed and velocity?

• Speed and velocity are the same

• Speed and velocity are not related

• Velocity is speed plus direction

• Speed is velocity plus direction

Energy stored in an object due to its height above the ground its gravitational potential energy. Energy stored by forces in a distorted elastic object is known as elastic potential energy. At which point would the pole have maximum elastic potential energy?

Select ONE correct answer.

A student designs an investigation to test the effects of variable mass on the force exhibited by a wagon. A student chooses a 50 g wagon and washers with a mass of 5 g each. Results are shown.

What force can be expected for the wagon and five washers?

(a)  

Which investigation is best to find the average speed of a toy car?

• Time how long it takes three different toy cars to travel a distance of 2 meters. Conduct three trials of the investigation. Calculate the speed by multiplying distance by time

• Time how long it takes a toy car to travel a distance of 2 meters. Repeat the investigation, timing how long it takes the toy car to travel a distance of 3 meters. Calculate the speed by dividing distance by time

• Time how long it takes a toy car to travel a distance of 2 meters. Conduct three trials of the investigation. Calculate the speed by dividing the average distance by the average time

• Time how long it takes a toy car to travel a distance of 2 meters. Conduct three trials of the investigation. Calculate the speed by multiplying the average distance by the average time.

Students measure the speed of a marble rolling down a ramp. The chart contains collected data. Which graph best represents this data?

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A student exerts a force on a wall. What is the net force acting on the wall?

(a)  

A golfer hit a ball 230 m from the tee to the green. The ball traveled south and landed on the green in 4 seconds. What was the ball's speed?

• 57.5 m/s south

• 57.5 m/s north

• 57.5 m/s

• not here

Which situation best explains Newton's first law of motion?

• Seat belts keep passengers restrained during a car wreck

• Carbon dioxide gas pushes up on a canister lid pushed down on the gas, causing an Alka-Seltzer rocket to launch

• Tectonic plates push against each other

• A baseball player hits the ball with enough force to score a home run

Which of the following describes the energy changes during photosynthesis?

• Mechanical energy to thermal energy

• Light energy to mechanical energy

• Chemical energy to thermal energy

• Light energy to chemical energy