Force & Motion

The three vehicles shown below are all traveling at a speed of 20 m/s, but only the pickup truck has a changing velocity.

The pickup truck has a changing velocity because the pickup truck –

• can accelerate faster than the other two vehicles

• is traveling in the opposite direction from the other two vehicles

• is traveling on a curve in the road

• needs a large amount of force to move

When a 8kg frog is jumping, it accelerates towards Miss Piggy at 6.8 m/s². What is the force, in Newtons, that the frog’s legs exert on the floor when it jumps?

• 1.2 N

• 56 N

• 54.4 N

• 1.1 N

If all the forces on the planets are balanced as they orbit around the sun, then the planets -

• Eventually slow down and stop

• Change the direction of its motion

• Accelerate towards the sun

• Continue moving at a constant velocity

What is the average speed a swimmer must swim in order to finish a 12 kilometer race in one and a half hours?

• 24 km/hr

• 8 km/hr

• 18 km/hr

• 0.125 km/hr

What object’s motion would most likely be represented by the graph?

• A train accelerating between stations

• A football being thrown down the field and intercepted

• An airplane touching down on a runway and applying brakes

• The movement of a taxi driving at a constant rate of speed

What is the speed of the object represented by the graph?

• 0.5 m/s

• 5 m/s

• 2 m/s

• 10 m/s

A train travels at a constant speed of 10 m/s for 2 minutes. The car increases its speed from 10 to 20 m/s during the next minute and then slows down to come to a stop in the next 2 minutes. What should the speed-time graph look like that best represents the car’s motion during this 5-minute period?

• A horizontal line, diagonal line up, horizontal line

• A diagonal line up, horizontal line, diagonal line down

• A horizontal line, diagonal line up, diagonal line down

• A horizontal line, diagonal line down, diagonal line up

What is the net force of the ball?

• 200N Right

• 200N Left

• 50N Right

• 50N Left

A football accelerates at a rate of 23 m/s2 forward when kicked by a player. The football has a mass of 0.8 kg. How much FORCE was applied to the ball to produce this acceleration?

• 18.4 N

• 19.4 N

• 28.75 N

• 20 N

Gary uses a magnet to move a 5.075 kg metal bar. The magnet exerts a force of 15N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?

• 2.96 m/s²

• 2.61 m/s²

• 0.34 m/s²

• 0.38 m/s²