# Physics

posted by .

A student pushes stright along the handles of a mower with a force of 200 N. The handles make a angle of 20°, with respect to the horizontal. The frictional force for the 25 kg mower is 100 N. What is the normal force on the mower, and what is the acceleration of the mower?

• Physics -

The normal(downward vertical)force on the mower is M*g + F*sin20 = 245 + 34.2 = 279.2 N
It is balanced by a vertical upward force from the ground.
The acceleration is the net forward force divided by the mass.

a = [(200 cos20) -100]/25 = 3.52 m/s^2

I doubt if the mower can sustain that acceleration rate for very long. After 3 seconds he would be moving faster than Usain Bolt.

## Similar Questions

A boy pushes a lawn mower with a mas of 17.9 kg starting from rest across a horizontal lawn by applying a force of 32.9N straight along the handle, which is inclined at an agle of 35.1 degrees above the horizontal. The magnitude of …
2. ### physics - forces

A person pushes a 16.0 kg lawn mower at constant speed with a force of 70.0 N directed along the handle, which is at an angle of è = 45.0° to the horizontal. Calculate the force the person must exert on the lawn mower to accelerate …
3. ### Ap physics

A person pushes a 15.0 kg lawn mower at constant speed with a force of 77.0 N directed along the handle, which is at an angle of θ = 49.0° to the horizontal . (a) Draw the free-body diagram showing all forces acting on the mower. …
4. ### physics

A person pushes a 11.0 kg lawn mower at constant speed with a force of 82.0 N directed along the handle, which is at an angle of θ = 45.0° to the horizontal.Calculate the normal force exerted vertically upward on the mower by …
5. ### physics

A person pushes a 14.0-kg lawn mower at constant speed with a force of F = 88.0 N directed along the handle, which is at an angle of 45.0º to the horizontal (Fig. 4–45). (a) Draw the free-body diagram showing all forces acting on …
6. ### physics

A woman pushes a lawn mower with a con- stant force of 112 Newtons at an angle of 37 with respect to the horizontal. The lawn mower moves at a speed of 20 cm/sec. What is her power output?
7. ### physics

A woman pushes a lawn mower with a con- stant force of 112 Newtons at an angle of 37 with respect to the horizontal. The lawn mower moves at a speed of 20 cm/sec. What is her power output?
8. ### Physics

A woman pushes a lawn mower with a con- stant force of 112 Newtons at an angle of 37degrees with respect to the horizontal. The lawn mower moves at a speed of 20 cm/sec. What is her power output?
9. ### Physics

A person pushes a 11.0 kg lawn mower at constant speed with a force of 76.0 N directed along the handle, which is at an angle of è = 41.0° to the horizontal. Calculate the normal force exerted vertically upward on the mower by the …
10. ### physics

A person pushes a 17.0 kg lawn mower at constant speed with a force of 74.0 N directed along the handle, which is at an angle of è = 48.0° to the horizontal (b) Calculate the horizontal retarding force on the mower (c) Calculate …

More Similar Questions