HS Physics Review on Motion in 1D, 2D and Forces

A ball rolls down a hill with a constant acceleration of 3.0 m/s². The ball starts at rest and travels for 4.0 s before it hits a wall. How far did the ball travel before it hit the wall?

• 6.0 m

• 12 m

• 18 m

• 24 m

A ball rolls down a hill with a constant acceleration of 3.0 m/s². The ball starts at rest and travels for 4.0 s before it hits a wall. What was the magnitude of the ball’s velocity just before it hit the wall?

• 3.0 m/s

• 8.0 m/s

• 12 m/s

• 48 m/s

The diagram above shows the friction force versus the normal force acting on a wooden box that is moving at constant speed on a table. What is the coefficient of kinetic friction between the box and the table?

• 0.5

• 2

• 0.05

• 0.02

Frictional force between two surfaces depends on which of the following?

I. speed of the objects rubbing together

II. surface area of the objects

III. materials the surfaces are made of

• I and II

• I and III

• I, II and III

• III only

A projectile is launched and follows a path as shown above. Four points are labeled on the parabolic path. Which is true about the horizontal speed of the projectile at each labeled point?

•  $v_L>v_M>v_N>v_P$  

•  $v_L<v_M<v_N<v_P$  

•  $v_L>v_P>v_M>v_N$  

•  $v_L=v_M=v_N=v_P$  

A projectile is launched and follows a path as shown above. Four points are labeled on the parabolic path. Which is true about the acceleration of the projectile at each labeled point?

• $a_L>a_M>a_N>a_P$

• $a_L<a_M<a_N<a_P$

• $a_L=a_M=a_N=a_P\ne0$

• $a_L=a_M=a_N=a_P=0$

The position of an automobile is shown with respect to time in the figure above. How far did the automobile travel between the times 1.00 s and 4.00 s?

• 40.0 m

• 30.0 m

• 20.0 m

• 10.0 m

The position of an automobile is shown with respect to time in the figure above. What is the average velocity of the automobile?

• +10.0 m/s

• -10.0 m/s

• +40.0 m/s

• -40.0 m/s

The diagram above shows the forces acting on a box. If the box is 4 kg, what is its acceleration?

• 4 m/s², left

• 4 m/s², right

• 3 m/s², left

• 3 m/s², right

A student hangs a fish on a spring scale inside the elevator. When the elevator is not moving as in Figure 1, the scale reads 50 N. When the elevator is moving as in Figure 2, the scale reads 20 N. What is the acceleration of the elevator when it is moving?

• 15 m/s², up

• 15 m/s², down

• 6 m/s², up

• 6 m/s², down