CA 3 Review

On a speed/distance graph, a straight horizontal line means

• The object or person started to move than stopped

• The object or person was moving at a constant speed

• The object or person was not moving

• The object or person was slowing down

If you were trying to lift a box into a pickup truck, which simple machine would be the most beneficial?

• Pulley

• Inclined plane

• Wheel and axle

• Screw

Why is it best to use a ramp to lift a box into a pickup truck?

• The ramp increases the distance the box is moved but decreases the amount of force needed to move the box

• The ramp changes the direction the box is moved

• The ramp is a barrier between the box and the ground so that gravity is not needed

• The ramp applies friction to the bottom of the box, making it easier for the box to slide

The motion of a toy car is graphed on a distance/time graph. The line on the graph shows a sharp increase which curves into a straight line. What can you tell about the movement of the toy car?

• The toy car speeds up while going forward then slows down

• The toy car slows down while going forward then goes backward

• The toy car moves forward at a constant speed, slows down than stops

• The toy car moves forward at an increasing speed, stops, then moves forward

Mickey and Minnie are the same size and weight and are racing bikes. They are riding at the same speed but encounter a wind blowing directly in their face. If they continue to pedal with the same amount of force, what is expected of their bikes?

• Mickey and Minnie's bike speed will decrease

• Mickey and Minnie's bike speed will increase

• Mickey's speed will decrease while Minnie's increases

• Minnie's speed will decrease while Mickey's decreases

The motion of a ball is graphed on a distance/time graph. If the ball travels a distance of 10m for 50s, what is the speed of the ball?

• 0.2 m/s

• 0.5 m/s

• 5.0 m/s

• 10.0 m/s

Distance divided by time is the formula for...

• Distance

• Acceleration

• Speed

• Time

What is the formula you would use to calculate time?

• Distance divided by time

• Speed times time

• Distance divided by speed

• Speed times distance

If Linda hikes a mountain that is 8.4 miles high with a speed of 1.2 miles per hour. How long will it take Linda to complete her hike?

• 7 hours

• 10.08 hours

• 0.14 hours

• 9.6 hours

If it takes Tim 2 1/2 hours to complete a 25-km run, what is his speed?

• 10 km/hr

• 1 km/hr

• 100 km/hr

• 12.5km/hr